100 (Respirators) - A number class rating used for respirators that represents that the respirator filters 99.7% of all particles measuring 0.3 microns or larger in diameter. This class filter is typically an HE or HEPA quality filter.
4-Point Suspension (Hard Hats) - A suspension, typically constructed from nylon webbing, which is attached to the inside shell of a safety helmet at 4 individual locations. This suspension typically consists of two straps, which cross perpendicularly at the top of the head, creating an X pattern to support the shell of the helmet off of the top of the head. The suspension also usually serves as the shock absorption for the helmet.
95 (Respirators) - A number class rating used for respirators that represents that the respirator filters 95% of all particles measuring 0.3 microns or larger in diameter.
99 (Respirators) - A number class rating used for respirators that represents that the respirator filters 99% of all particles measuring 0.3 microns or larger in diameter.
Abate - The act of significantly reducing or ending the risk of a hazard.
Above Ground Wiring - Another name for overhead power and communications lines, such as telephone or cable television wiring. These wire are strung between utility poles which must be grounded, and can span great distances.
Abrasion - The process of scraping or wearing away - often used in place of damaging.
Abrasion Guard - A treatment used on material to prevent the material from being damaged while in contact with other materials or equipment that might scrape or damage the material.
Access - The right to enter or use; typically a communications site or building.
Accessory Loop - A feature of a full body harness, tool belt, or pouch where a tool or piece of hardware can be stored when not being used. Typically located on the belt, or seat sling of a harness, an accessory loop provides a location to clip a carabiner, tool tether, or other piece of equipment that needs to be accessed during work at-height.
ACI - American Concrete Institute
Activation Distance - The distance traveled by a fall arrester or the amount of line paid out by a self-retracting lifeline from the start of a fall to the point where the fall arrester or self-retracting lifeline begins to apply a braking or stopping force.
Administrative Controls - Employer mandated safe work practices or procedures that are designed to prevent exposure to a fall by signaling or warning an authorized person to avoid approaching a fall hazard.
Aerated - The process of introducing air into a material.
Aggregate Strength - The strength derived by totaling the individual breaking strengths of the elements of a strand or rope. This strength does not give recognition to the reduction in strength resulting from other factors that may affect efficiency like knots or termiation plates.
AGMA - American Gear Manufacturers Association
Air Tools - Tools operated by compressed air.
AISC - American Institue of Steel Construction
AISE - Association of Iron and Steel Engineers
Albert’s Lay - See Lang Lay Rope.
ALC - Automatic Level Control.
Alloy - A metal that is made by combining two or more different types of metals. Usually done to provide added strength and/or resistance to corrosion.
AM (Radio) - Amplitude modulation (AM) is a modulation technique used in electronic communication, most commonly for transmitting information via a radio carrier wave. In amplitude modulation, the amplitude (signal strength) of the carrier wave is varied in proportion to that of the message signal being transmitted.
Analog (Two-Way Radio) - An analog radio transmits the audio signal in the form of electrical signals resembling sound waves. In comparison, digital radios process the audio into a pattern of numbers, which are then re-encoded by the receiving radio into sound waves.
Anchor Attachment - The act of a user who is wearing personal fall protection equipment, connecting directly or indirectly to an anchorage. It also means the condition of an employee being connected to an anchorage.
Anchor Guys - Guy Wires run from the top of a pole to the ground. Used as support to poles with angles, unstable soil of in line dead-ends. The guy transfers the unbalanced force on a pole or structure to the earth without intermediate support.
Anchor Rods - The connecting link between a guy wire and an anchor.
Anchor Shaft - A steel shaft extending from a concrete anchor and used to attach guy wires.
Anchorage - A piece of equipment or structure that provides a secure attachment point for workers. Anchorage points must be rated for at-least 5,000 pounds.
Anchorage Connectors - A component or subsystem that functions as an interface between the anchorage and the fall protection, work positioning, rope access, or rescue system for the purpose of coupling the system to the anchorage.
Anco - A type of locking nut. An Anco nut has a bit of a stiff wire protruding from one face. This piece of wire rides in the threads of the mating bolt, preventing any unintentional slippage. Note: Anco nuts should not be re-used. If they are removed, they should be replaced.
Anemometer - A device that measures the speed of any current of gas or wind.
Angle Indicator, Boom - An accessory that measures the angle of a boom or platform in reference to horizontal.
Angle of Loading - The inclination of a leg or branch of a sling as measured from the horizontal or vertical plane.
Annular Cutter - A hollow, multiple cutting edges cutting tool used to make/drill holes in ferrous and non-ferrous metals. Also called a core drill, core cutter, broach cutter, trepanning drill hole saw, or cup-type cutter.
ANSI/ASME B30.23 - Standards for Personnel Lifting Systems.
ANSI/ASME B30.26 - Standards for Rigging Hardware.
ANSI/ASME B30.7 - Standards for Winches.
ANSI/ASME B30.9 - Standards for Slings.
ANSI/ASSE A10.32 - Standards for Personal Fall Protection Systems for Construction and Demolition Operations.
ANSI/ASSE A10.33 - Requirements for Multi-Employer Projects.
ANSI/ASSE A10.34 - Protection of the Public on or Adjacent to Construction Sites.
ANSI/ASSE A10.4 - Standards for Personnel Hoists and Employee Elevators.
ANSI/ASSE A10.42 - Safety Requirements for Rigging Qualifications and Responsibilites.
ANSI/ASSE A10.44 - Control of Energy Sources (Lockout/Tagout) for Construction & Demolition.
ANSI/ASSE A10.48 - Criteria for Safety Practices with the Construction, Demolition, Modification and Maintenance of Communication Structures.
ANSI/ASSE A10.5 - Standards for Material Hoists.
ANSI/ASSE A10.6 - Safety Requirements for Demolition Operations.
ANSI/ASSE Z359.2 - Minimum Requirements for a Comprehensive Managed Fall Protection Program.
ANSI/ASSE Z490.1 - Criteria for Accepted Practices in Safety, Health and Environmental Training
ANSI/IEEE C95.1 - Standard for Safety Levels with Respect to Human Exposure to Electric Magnetic. and Electromagnetic Fields, 0 Hz to 300 GHz.
ANSI/TIA 222-G - The structural standards for steel antenna towers and antenna supporting structures. The objective of this standard is to provide minimum criteria for specifying and designing steel antenna towers and antenna supporting structures.
ANSI/TIA 322 - Loading Criteria, Analysis, and Design Related to the Installation, Alteration and Maintenance of Communication Structures
Antenna Array - A platform, typically three sided, where telecom carriers place equipment to provide signal transmission and reception to a specific area. The number of antennas in an array varies based on a number of factors, including the number of active subscribers for that carrier, the volume and type of network usage by subscribers, technology being used, and type of spectrum currently used by the carrier.
Antenna Mount - A steel structure attached to a tower to which antennas are fastened to for broadcast of signals.
Applicable - Appropriate or capable of being applied.
Application - What something is meant to be used for or how something is meant to be used.
Appurtenance - An addition to a major structure that extends outside the boundaries of that structure.
APR - The acronym for Air-Purifying Respirator. APR's can consist of a disposable respirator, reusable half-mask, full-face mask, or supplied air respirators.
Arborist - See Tree Care.
Arresting Distance - The distance that it takes for fall protection equipment to arrest the fall of a worker. This distance also includes the calculations for equipment stretch.
Arresting Force - The amount of force exerted on a worker when a fall protection system arrests a fall. Usually the highest peak forces experienced during a fall.
Armored Rope - See Steel-Clad Hoisting Rope.
Armor Rod - A covering used to protect a conductor from damage due to excessive vibration.
ASA - American Standards Association
ASD - ASD, or allowable stress design, is a method of analysis in which the design strength of the structure is equivalent to its ultimate strength divided by a specified factor of safety.
ASM - American Society of Metals
ASME - American Society of Mechanical Engineers
ASME B30 - The American Society of Mechanical Engineers standard for lifting and rigging
ASNT - American Society of Nondestructive Testing
Assisted Rescue - A rescue requiring the assistance of others.
ASTM - The American Society for Testing and Materials - an international standards organization
ATPV (Arc Thermal Performance Value) - A value representing the energy necessary to pass through any given fabric to cause, with 50% probability, a second or third degree burn. Typically measured in calories/cm2. Also referred to as Arc Rating.
Attach - To fasten or connect.
Authorized (Basic) Climber - An individual with the physical capabilities to climb who may or may not have previous climbing experience, but has training in fall protection regulations, the equipment that applies to the field including instruction for their proper use; able to climb designated fixed access routes equipped with safety climb devices.
Authorized Person - A person assigned by the employer to perform duties at a location where the person will be exposed to a fall hazard.
Authorized Rescuer - A person assigned by the employer to perform rescue from fall protection.
Auto-Lock (Carabiner) - A three stage designed gate on carabiners that will automatically shut and locked when the user lets go of the gate.
Auxiliary Hoist - Supplemental hoisting unit.
Average Power - The transmitter power available averaged over a modulation cycle. The power actually available to do work.
Average Time - The appropriate time period over which exposure is averaged for purposes of determining compliance with a Maximum Permissible Exposure (MPE).
Aviation Paint - A specially formulated industrial coating designed to meet the requirements for brightness and color accuracy according to FAA specifications for communication towers. Aviation paint also has greater durability and protective properties than standard exterior paint.
AWG - American Wire Gage
AWS - American Welding Society
AWS D1.1/D1.1M - Structural Welding Code (Steel)
Axis of Rotation - The vertical axis around which a crane superstructure rotates. Also called center of rotation (obsolete) and swing axis.
Azimuth (Antenna Alignment) - The direction of a celestial object from the observer, expressed as the angular distance from the north or south point of the horizon at which a vertical circle passing through the object intersects the horizon. A calculation important for installing antennas. Antenna aligners often calculate this measurement.
Back-Hitch Gantry - A fixed-or adjustable-height structure that forms part of the upper structure of a mobile crane, to which the lower spreader (carrying live boom-suspension ropes) is anchored.
Ballast - Weight added to a crane base to create additional stability; it does not rotate when the crane swings.
Barrel - The lagging or body part of a rope drum in a drum hoist.
Barricade - A piece of equipment used to separate areas of danger from safe zones. Barricades can be used to help regulate traffic, vehicular and pedestrian, away from dangerous construction areas and situations. Barricades can consist of cones, bollards, fencing, netting, rope flags, and more.
Barrier - A physical obstruction, which is intended to prevent contact with energized lines or equipment.
Base (Hoist) - The mounting flanges or feet used to attach a hoist to its supporting structure or foundation.
Base Curve - A measure of the flatter curvature of the front surface of the lens on a pair of safety glasses.
Base Mounting - The structure forming the lowest element of a crane or derrick; it transmits loads to the ground or other supporting surfaces. For mobile cranes, this is synonymous with carrier or crawler mounting. For tower cranes, the term includes a travel base, knee frame base, or fixed base (footing).
Base Section - The lowermost section of a telescopic boom; it does not telescope but contains the boom foot pin mountings and the boom hoist cylinder upper end mountings.
Basic Boom - The minimum length of sectional latticed boom that can be mounted and operated. This usually consists of a boom base and tip section only.
Basket (Sling Configuration) - A configuration for rigging slings or fall arrest anchorage where the sling cradles the load or anchor with both ends of the sling function as if they were two separate slings. The capacity of this configuration can be up to twice that of the same sling in a vertical hitch, but only if the sling angle of each leg is 90 degrees.
Basket Support (Gin pole) - The lower support for a gin pole once in position. The basket support provides vertical and lateral support for the gin pole.
Bearing Life - The number of revolutions or the number of hours at a constant speed that 90 percent of an apparently identical group of bearings will complete or exceed before the first evidence of fatigue develops; i.e., 10 out of 100 bearings will fail before rated life. Minimum life and L10 life are also used to mean rated life.
Beater - Slang for a sledgehammer. Usually preceded by its weight: “six-pound beater”.
Becket (Pulley) - An extra rigging hook or eye on a pulley, or block, where a rope can be anchored. Often used in a mechanical advantage or haul system. A becket is on the other side of the pulley from the fixed anchorage point.
Becket Loop - A loop of a small rope or strand fastened to the end of a large wire rope. Its function is to facilitate wire rope installation.
Bend Radius - The distance from the center of a pulley to the edge, which should be considered based on rope diameter, construction, and use. The smaller the bend radius, the more flexible the rope should be. The larger the bend radius, the less stress is placed on the rope while running through the sheave of the block or pulley.
Bending Stress - Stress that is imposed on the wires of a strand or rope by a bending or curving action.
Birdcage - An informal description of the appearance of a wire rope forced into compression. The outer strands form a "cage" and at times, displace the core.
Block and Tackle - The primary parts of rigging. Consists of the block and the line attached through the block.
Blow Torch - A device that produces a hot flame that is directed onto a surface. Often used in welding.
Body Extension (Tower) - The tower section that goes between the leg extension and the main tower body to adjust the tower height.
Body Harness - An integral part of a personal fall protection system. A body harness, also known as a full body harness, provides an anchorage point to safely secure a worker to a structure. In the event of a fall, a harness must be able to withstand the forces of the fall and support the victim until rescue arrives.
Body Support - See Body Harness.
Body Wear - A term used to describe either a body belt or body harness.
Bolt Bag - A tool pouch, typically worn on a tool belt or waist belt of a harness, what a worker uses to store tools, hardware, construction components, and other accessories required for a job. Bolt Bags are available in a variety of sizes, configurations, and materials. Duck canvas is a popular construction material, but recently synthetic materials like nylon, polyester, and tarpaulin have replaced traditional canvas.
Bolt Type Shackle - A type of shackle where the pin has a male threaded end, which is fed through the body of the shackle, and secured with a bolt on the outside of the shackle. This is different from a screw type shackle, where the pin threads into a female thread in the body of the shackle.
Bond (Electrical) - An electrical connection from one conductive element to another for the purpose of minimizing potential differences, providing suitable conductivity for fault current, or for mitigation of leakage current and electrolytic action.
Boom Base - A boom base is the lowermost section of a sectional latticed boom having the attachment or boom foot pins mounted at its lower end; also called boom butt or butt section.
Boom Gate - An antenna mounting bracket that positions the antenna away from the tower structure. This often resembles a fence gate.
Boom Hoist Cylinder - A hydraulic ram used instead of a rope boom suspension, it's the most common means of derricking telescopic booms.
Boom Inserts - Center sections of a sectional latticed boom usually having all four chords parallel.
Boom Stop - A device intended to limit the maximum angle to which a boom can be raised.
Bow Bits - See Bolt Cutters.
Bracing - The act of adding material to something to provide additional strength and rigidity.
Brake - A device used for reducing or stopping motion by friction or power means.
Breaking Strength - The greatest stress that a material or piece of equipment is capable of withstanding without rupture.
Breast Guy - A guy wire attached to the leg at the same elevation as a torque arm/stabilizer guy station. This is used when large structural guys are used/needed but only minimal torque exists.
Bridle Slings - Sometimes called Bridle Supports, these are anchorage swings that are attached to the uppermost support point of a gin pole and secured to the tower. They restrict the pole from moving horizontally.
Bright Rope - Wire rope fabricated from wires that are not coated.
Broadcast - The transmission of sound, signals, or images by radio waves.
Broadcasting Company - Also known as a broadcaster. A potential customer in the radio or TV business. They typically use taller towers than others in the industry, but most broadcasting companies have fewer towers.
Brooming - Unlaying and straightening of strands and wires in the end of wire ropes during the process of installing a wire rope socket.
Brushed Motor - An internally commutated motor, ran on direct current. Brushed DC motors are varied in speed by changing the voltage or strength of the magnetic field, which rotates the axis of the motor.
Brushless Motor - Also known as electronically commutated motors, brushless motors use a switching power supply which produces an AC electrical current to drive each phase of the motor. These motors have a high power to weight ratio, high speed, and are being used more in more in cordless power tools.
BTU (British Thermal Unit) - A traditional unit of heat, defined by the amount of heat required to raise the temperature of one pound of water by one degree Fahrenheit. Heated gear, heat guns, and torches often have BTU ratings.
Buckle - A connector for attaching a strap or webbing segment to either another strap or webbing segment or back to itself.
Bull Pole - A pole, generally a steel pipe, which is mounted laterally from the base of a derrick mast. It is used to swing the derrick manually.
Bull Ring - The main, large, ring where sling legs are attached. Also known as master link.
Bumper - An energy-absorbing device that reduces impact when two moving cranes or trolleys come into contact or when a moving crane or trolley reaches the end of its permitted travel. Also referred to as a buffer.
Buss Bar - Usually made of various thicknesses of copper that is drilled to accommodate ground system end connections (1/4” is a common thickness used). Also known as a ground bar.
Cable Clip - A cable clip is a U-Bolt and saddle assembly used to hold a loop together on the dead end of guy cable or wire rope. “Never saddle a dead horse” is a way to remember proper installation of cable clips.
Cable Cutters - A cutting tool similar to bolt cutters, but with curved jaws that apply pressure around the diameter of cable during a cut, so that the cable is cut evenly.
Cable Grab - See Cable Safety Sleeve.
Cable Loss - The amount of RF signal lost while it travels on a cable.
Cable Safety Sleeve - A mechanical device which is part of a cable safe climb system to arrest the fall of a worker in the event they slip off of a ladder while ascending or descending. Available in a number of different designs, a cable safety sleeve, frequently called a cable grab, functions with a cam that positively clamps onto the cable when a rapid downward force is applied to the device. These devices also typically include a shock absorption feature to safely decelerate the worker.
Cable Sleeve - See Cable Safety Sleeve.
Cable Slings - Wire rope slings.
Cable-Laid Wire Rope - A wire rope consisting of several independent wire ropes wrapped around a fiber or wire rope core.
Cal (Calorie) - A calorie is a unit of energy, typically used to define the amount of energy found in food. A small calorie is defined as the amount of energy required to raise the temperature of one gram of water by one degree Celsius at a pressure of one atmosphere, food is typically defined in kcals, which is 1000 small calories.
Candelabra - An antenna mounting platform, typically placed at the top of the tower, that is designed to hold multiple antennas.
Cantilever - The projection of a gin pole above a bridle or upper most support.
Capacity - The maximum amount that something can contain or manage. Safety equipment typically has capacities for the maximum amount of load or weight that a device or piece of gear can manage. Capacity can also refer to the maximum amount of equipment that can be stored in a bag, pouch, or bucket.
Capstan Hoist - An axled rotating mechanical device, originally developed on sailing ships, which uses rope wrapped around a rotating drum to lift and lower loads. The wraps of rope create friction around the drum as it rotates, feeding the rope around the drum and lifting the load. Capstans are used in the telecom and utility industries to raise antennas, tower components and transformers into position.
Carabiner - An oval or D-shaped ring, typically constructed from steel or aluminum, which has a spring-loaded gate used to connect components. Used in personal fall arrest and safety equipment configurations, a carabiner is widely used in telecom, wind energy, climbing, rope access, construction, window cleaning, and more.
Carbide Steel - A highly abrasion resistant steel compound often used in cutting equipment like mag drill cutters and drill bits. A high temperature resistance also allows faster machining and fabrication.
Carrier (Ladder Safety) - The track of a ladder safety device consisting of a flexible cable or rigid rail.
Casing - A steel insert designed to support the walls of a foundation hole.
Cathead - An informal term for Capstan Hoist.
Cathode - A metallic structure such as an anchor that an anode attaches to, in order to prevent corrosion.
Cathodic Protection - Technology that utilizes electro-chemical principals to mitigate corrosion on underground buried structures. A means of controlling corrosion of metal through use of a sacrificial metallic anode.
CDL - Commercial Driver's License
CDMA - Code Division Multiple Access. One of three different technologies used to broadcast signals between towers and wireless telephones in a PCS or cellular telephone system. The other technologies are TDMA and GSM.
CE EN - A certification required within the European Union that personal protective products must obtain before they can legally be placed on the market.
Cell Site - A cellular site used for broadcasting cellular signals. Typically includes a tower, building, fencing, and miscellaneous site work.
Center of Gravity - The exact point around which a load is balanced. An important concept to consider when performing overhead lifting and rigging.
Certified Anchorage - An anchorage for fall arrest, positioning, restraint,or rescue systems that a qualified person certifies to be capable of supporting the potential fall forces that could be encountered during a fall or that meet the criteria for a certified anchorage.
CFR - Code of Federal Regulations
Chain Bracket - A mount for a capstan hoist that uses chains to secure itself to a structure. Typically mounted to the leg of a tower or a utility pole, chain brackets, also sometimes called chain mounts, are often the only way securely anchor the 3,000 lb capstan hoist made by Hubbell Power Systems.
Chain Jacket - A device used to apply tension to a guy wire using a lever-lock principle.
Chain Mount - See Chain Bracket.
Chain Positioning Assembly - A piece of hardware for use in work positioning consisting of a length of chain or webbing with snaphooks or carabiners on either end, with a floating rebar hook along the chain in the center. The ends attach to positioning D-Rings on a full body harness, and the center hook attaches to the tower or structure, allowing the use of both hands to work.
Channelizer - A cone shaped device, typically made from plastic, to help divert and direct traffic in a construction zone. Thinner than a traditional traffic barrel, a channelizer is a great option when working in narrow construction zones. Channelizers vary in height, and can have different reflective properties in both material and location.
Cheek Plate - The stationary plates that support the pin (axle) of a sheave or load.
Cheek Weights - Overhauling weights attached to the side plates of a lower load block.
Cherry Picker - A small crane that can be used for handling materials.
Chest D-Ring - Also known as the sternal attachment point, the chest D-ring is located on the chest strap of a full body harness. The chest D-ring is typically used when climbing a fixed cable safe climb system on a ladder, although it can also be used in fall arrest in certain industries with the proper equipment.
Chest Strap - A piece of material, typically made from webbing, which connects the shoulder straps of a full body harness. Typically secured using mating buckles of quick connect connectors, the chest strap should be worn across the pectoral muscles. The chest strap on some harnesses can also include a chest D-ring.
Chocks - A block or wedge under a wheel, etc. to prevent motion.
Choker (Sling Configuration) - A configuration of a rigging or fall protection sling where one end the sling passes around the load or anchorage point, and the other is fed through the first end and connected to the hook or fall protection system. This configuration is the weakest of the three, choker, basket, straight, due to the stress point at the connection.
Choker Rope - A short wire rope sling that forms a slip noose around an object that is to be moved or lifted.
Chuck - A specialized design of clamp which is typically found in hand drills. A chuck uses jaws, sometimes called dogs, that are arranged symmetrically to tighten down on the drill bit.
Circuit - A conductor or system of conductors through which an electric current is intended to flow.
Circular Mil - A standard unit of measure used to indicate conductor size. One circular mil is equal to the area of a circle that has a diameter of .001 inches.
Clamp (Cable) - A cable fitting that transfers force by friction.
Class 1 (Hi-Vis) - A garment that provides the minimum amount of hi-vis material required to differentiate a worker visually from backgrounds around non complex work environments.
Class 2 (Hi-Vis) - A garment that provides longer detection and identification distances and increased conspicuity performance compared to class 1.
Class 3 (Hi-Vis) - A garment that provides greater visibility in both complex backgrounds through a full range of body movements.
Class A (Fire Extinguisher) - A fire extinguisher designed for use on fires involving solid materials such as wood, paper, or textiles. Multipurpose extinguishers are often rated as A-B, or A-B-C.
Class A Kits (First Aid) - ANSI classification denoting that the first aid kit is designed for common workplace injuries.
Class C (Fire Extinguisher) - A fire extinguisher designed for use on electrically energized fires, often fueled by motors, appliances, and electronic transformers. Multipurpose extinguishers are often rated as B-C, or A-B-C.
Class D (Fire Extinguisher) - A fire extinguisher designed for use on flammable metals, such as titanium, magnesium, aluminum, and potassium.
Class E (Hi-Vis) - Supplemental apparel such as bibs, shorts, and gaiters, which are not compliant when worn alone, though, when combined with class 2 or class 3 apparel the combinations satisfies the class 2 or class 3 requirement.
Class N (Respirator) - A letter class rating for respirators representing that the respirator is not oil resistant.
Class P (Respirator) - A letter class rating for respirators representing that the respirator is oil proof.
Class R (Respirator) - A letter class rating for respirators representing that the respirator is resistant to oil.
Clearance - The horizontal or vertical distance from any part of a crane to a point of the nearest obstruction.
Clevis - Clevis refers to the shank, shaft, or bolt in an attachment hardware that is certified for perpendicular strength. Often interchanged with the term shackle.
Climb Assist - A system which provides climbing assistance for workers ascending a permanent fixed ladder, often found inside wind turbines. These systems are in place to reduce fatigue, increase safety, and help eliminate the chances of a worker slipping during their ascent.
Climb Higher - The Registered slogan from GME Supply Company, which is aimed to inspire people to not only physically climb higher vertically, but to continue to improve themselves individually.
Climbers - An informal term for metal hooks, which strap to a lineman's feet used to climb wood utility poles. Used for ascending, descending, and maintaining the working position on poles when no other means of support are available.
Climbing Gaff - Metal hooks, which strap to a lineman's feet used to climb wood utility poles. Used for ascending, descending, and maintaining the working position on poles when no other means of support are available.
CO (Gas) - Commonly known as carbon monoxide - colorless, odorless, combustible, and lethal gas produced by incomplete combustion of fossil fuels (coal, natural gas, petroleum), biomass, and carbon containing products (such as wood).
Coaxial Cable - A type of transmission cable that has an inner conductor surrounded by a tubular insulating layer, surrounded by a conducting shield. Many also have an insulating outer sheath or jacket. On telecom and communications towers, coaxial cable is typically used as a transmission line to carry a signal to the top of the tower.
Coffin Hoist - See Chain Jacket.
Cold Galv (Cold Galvanizing Compound) - A zinc rich coating which bonds to iron, steel, or aluminum to provide protection against rust, rust creepage, and other oxidation, via al galvanic action. Cold Galvanizing Compound creates a similar finish to hot dipped galvanization, without requiring high temperatures or large zinc baths. Cold Galv is often used in the telecom and utility industry to seal steel which has been modified by cutting, grinding, or welding.
Competent Person - OSHA defines a competent person as someone who is capable of identifying existing and predictable hazards or working conditions, and has authorization to take prompt corrective measures to eliminate them.
Competent Rigger - Knowledgeable and experienced with the procedures and equipment common to the communication structures industry and trained to identify hazards with authorization to take prompt corrective measures. Capable of supervising the lift and communicating the rigging plan effectively to the entire crew, including the crane operator for jobs in which a crane is used. This person is required on site at all times for rigging activity.
Compression Tool - A tool that is similar in appearance to cable cutters, but is designed to compress a connector onto a wire or cable.
Concave - A curve similar to the interior of a circle or hollow sphere.
Concrete Anchor - A fall protection anchorage solution designed to be either permanent or temporary in a concrete structure. The anchor, which includes a D-Ring, is typically cast securely into the concrete to provide a 5,000 pound ANSI rated anchorage point.
Confined Space - An area that has an opening large enough for a worker to access and enter to perform work. The area has a limited or restricted means of entry or exit, and is not designed for continuous human occupancy. Some examples of confined spaces include: storage or rail cars, manholes, tunnels, silos, grain elevators, bottom access enclosures like water towers. Confined spaces require specialty fall protection and rescue equipment, as well as gas monitors and air circulation equipment.
Connector - A piece of hardware, typically a snaphook, carabiner, or shackle, which attaches a lanyard or tether to a full body harness, anchor, or load. Depending on the utility, the connector may be required to meeting specifications or standards, like ANSI.
Construction Classification I - An ANSI 10.48 Construction Classification. This class is described as any load less than 350 pounds gross load, requires a competent rigger, and does not require a written rigging plan.
Construction Classification II - An ANSI 10.48 Construction Classification. This class is described as any load less than 500 pounds gross load, requires a competent rigger, and requires a written rigging plan.
Construction Classification III - An ANSI 10.48 Construction Classification. This class is described as any load greater than 500 pounds gross load, requires a qualified person, and requires a written rigging plan.
Constuction Classification IV - An ANSI 10.48 Construction Classification. This class is described as any unique lift, member removal, or a lift that may have stability impacts. It requires a qualified engineer, and a written rigging plan.
Continuous Fall Protection - One or more fall protection systems that provide fall protection without interruption.
Cordage Meter - A device which accurately measures length of rope, cord, or wire, using a toothed measuring wheel and stainless steel pressure shoe. A cordage meter is useful to precisely measure and cut a specific length of rope for use in rigging, rescue, or rope access style work.
Corrosion - The electromechancial process in which a refined metal returns to its native state such as steel to iron oxide. This process is magnified in certain conditions such as in low resistance electrolytes where a current can easily flow and/or when an anodic material is attached electrically to another metal.
Corrosion Resistant Steel - Chrome-nickel steel alloys designed for increased resistance to corrosion.
Counter Torque - Torque applied in the opposite direction of pre-existing torque.
COWs - Cell-site On Wheels.
Creep - The unique movement of a wire rope with respect to a drum surface or sheave surface resulting from the asymmetrical load between one side of the sheave (drum) and the other. It is not dissimilar to the action of a caterpillar moving over a flat surface.
Crew Chief - The head of a crew. A person that is authorized, designated, deemed competent and qualified by the employer.
Crimper - A crimper is a tool for adding indents or compressions on fittings or lugs for attachments to wires.
Critical Diameter (Wire Rope) - For any given wire rope, it is the diameter of the smallest bend that permits both wires and strands to adjust themselves by relative movement while retaining their normal cross-section position or size.
Crosby Clips (Crosbies) - Crosby is a brand of rigging equipment, but their cable clips are so universally used that many riggers just call them Crosbies. Crosby clips are used to connect two pieces of wire rope, or to form an eyelet at the end of a cable. The name refers to the manufacturer, The Crosby Group, Inc.
Cross-Rods - Also referred to as Diagonals, Hog Rods, or Wind Bars these are structural members on the tower that extend diagonally between two points on the tower face. On tall towers these are often removable for repair or replacement.
Crown Block - The sheave assembly used to change the direction of the load line or jump line coming from the hoist and is attached at the uppermost location of the structure. Also referred to as Top Block or Load Block.
CSA - Canadian standards organization - similar to ANSI.
CTIA - Cellular Telecommunications Industry Association
Cubic Feet per Minute (CFM) - A standard measure of volumetric flow, measuring the amount of material passing through an area in a minute. Often used to quantify the performance of a blower, compressor, or fan.
Cut Resistance - The ability for a material to prevent a sharp edge from penetrating the exterior of the material when pressed and drug across. Often used in gloves, shirts and pants, synthetic materials, like Dyneema, Kevlar, and to a lesser extent, Polyester and Nylon, provide cut resistance for workers handling sharp objects or using knives and blades.
Cycle (Electrical) - One complete transition from zero volts to maximum positive volts, down to zero volts, through to maximum negative volts, and back to zero.
D-ring - A loop, typically made from steel or aluminum, which is affixed to an anchor point, or fall protection harness. The D-ring serves as a connection point to attach a lanyard, tether, or other fall protection equipment.
D/d Ratio - A ratio used to describe the diameter of the sheave of a pulley versus the size of the rope. The upper case D refers to the diameter of the sheave, while the lower case d represents the diameter of the rope. Depending on the type of rope being used, the D/d ratio varies from 6:1 to 10:1 according to ANSI A10.48.
Dampening Weights - Devices added to conductors to reduce conductor vibration or movement due to wind.
Damper - A device attached to the cable that modifies the structural response to dynamic loads.
Davit System - Commonly used to raise, lower, suspend, and rescue personnel working in confined space applications like manholes, tanks, or vaults, the system consists of an anchored base and arm which can be extended or swung over to work area. A davit arm or davit system uses a winch, pulleys, or mechanical advantage system to raise and lower the worker.
DC (Direct Current) - The unidirectional flow of an electrical charge, such as the power supplied by a battery. Direct Current differs from alternating current because it does not travel as an oscillating wave, rather a straight constant line.
De-Rate - To take down the capacity rating due to friction, load, or bushing.
Dead Load - The weight of a structure and all the material permanently fastened to it.
Deadman Anchor - A type of underground anchor shaft foundation generally formed of concrete.
Deceleration Device - Any mechanism, such as a rope grab, rip-stitch lanyard, specially woven lanyard, tearing or deforming lanyards, automatic SRL, etc. which serves to dissipate a substantial amount of energy during a fall event.
Deceleration Distance - The additional vertical distance a falling worker travels, excluding lifeline elongation and free fall distance, before stopping, from the point at which the deceleration device begins to operate. Measured as the distance between the location of the full body harness attachment point at the moment of activation of the deceleration device during a fall, and the location of that attachment point after the employee comes to a full stop.
Decelerator - Any force which acts to slow or stop movement.
Delineator - Similar to channelizers and cones, delineators help guide pedestrians and vehicles in a construction or work zone. Typically made from plastic and available in a variety of colors and reflectivity options, they can be permanently mounted or secured with weighted bases.
Derrick - A kind of crane with a movable pivoted arm for moving or lifting heavy weights. It is most commonly associated with ships.
Descender - A mechanical device which provides a means of controlled lowering on a synthetic rope for rescue and rope access work positioning. The rope is typically fed through or around a descender to create friction which can be controlled by the user to vary their descent speed and position.
Dexterity - Having skill and precision in performing tasks, especially with the hands. Dexterity is an important factor to consider when selecting hand protection and gloves, especially if a worker will be performing tasks which require small tools or precise movements.
DGPS - Differential Global Position System.
Digital (Two-Way Radio) - Digital radios convert the audio signal into a series of 1's and 0's to transmit the communication. When these signals are received, they are reencoded into a standard audio format and projected from the radio speaker. In comparison, analog radios transmit the audio signal in the form of electrical signals resembling sound waves.
Digital Multimeter (DMM) - A tool to measure two or more electrical values, typically voltage in volts, current in amps, and resistance in ohms. Using two or more leads, which are insulated wires which serve as conductors, digital multimeters can accurately measure these electrical values.
Direct Ventilation (Eyewear) - Ventilation in goggles where the vented section is front-facing and allows a direct, straight line passage from the outside to the inside of the eyewear. Direct ventilation goggles must still meet ANSI standards and prevent objects measuring 1.5mm in diameter or larger from entering the goggles. These goggles are not suitable for use where splash hazards are present.
Disciplinary Action - Administrative action taken by the employer against the employee. May vary from verbal reprimand to dismissal.
Discreate Appurtenance - An appendage to a structure that is connected at one primary point on the structure. A small sign is an example of a discrete appurtenance.
Dish - A highly directional antenna, slang for a parabolic reflector.
Distance To Fault (DTF) - That distance between a test signal and the problem area on a transmission line. This test will determine the length of the cable system and the return loss of each component to identify the contributory affect of each component on the total antenna system.
Doff - The act of removing an article of clothing. Taking off a full body harness is often called doffing the harness.
Dogleg - A permanent bend or kink in a wire rope caused by improper use or handling.
Donn - The act of putting on an article of clothing. Putting on a full body harness is often called donning the harness. This process also includes properly adjusting the harness to a proper fit.
DOT - Department of Transportation. A department of the government that is responsible for the national highways, railroad, and airline safety.
Drag Brake - A brake that provides reduction force without external control.
Drill Bit - A cutting tool used to remove material to create holes. Drill bits almost always have a circular cross section and come in many sizes and shapes. They can create many different types of holes in different kinds of material.
Drop Zone - The area below a tower or structure where work is being performed at-height where any object dropped will land. Generally figured to be one-half to one foot in diameter for each foot up.
Drum (Rope) - A cylindrical barrel, either of uniform or tapering diameter, on which rope is wound for operation or storage; its surface may be smooth or grooved.
Dry Chemical Fire Extinguisher - A fire extinguisher that is filled with Monoammonium phosphate, ABC Dry Chemical ABE Power, tri-class, or multi-purpose dry chemical used to extinguish class A, class B, and class C fires.
Duck Canvas - A heavy, plain woven cotton fabric that is more tightly woven than plain canvas. It is also referred to as cotton duck, duck, or duck cloth. This material is typically used in bags, buckets, and some forms of PPE.
Dynamic Range - The ratio of the largest signal level a circuit can handle to the smallest signal level it can handle (usually taken to be the noise level), normally expressed in dB.
Dynamic Rope - Dynamic usually refers to a dynamic type of rope, which is considered a somewhat elastic rope. The "stretch" caused by the elasticity is what makes the rope dynamic. Dynamic ropes are great for rock climbing, ice climbing, and mountaineering but are not used for industrial applications. They are the opposite of static ropes.
Dynamometer - A device that measures load, tension, and force. These devices are frequently used in guy wire tensioning or swap outs on a cell phone or communications tower.
Dyneema - Dyneema is an Ultra High Molecular weight Polyethylene (UHMwPE) or High Modulus Polyethylene (HMPE) Fibre that has gained a reputation as being the lightest, strongest fiber in the world. It is 15 times stronger than steel, hydrophobic, and resistant to chemicals and UV rays.
E (Extension Cord) - An extension cord jacket rating representing that the jacket is made of TPE (thermoplastic elastomer rubber).
Eddy Current Brake - A device for controlling load speed in the hoisting or lowering direction by placing a supplementary load on the motor. This loading results from the interaction of magnetic fields produced by an adjustable or variable direct current in the stator coils and induced currents in the rotor.
EDGE - Enhanced Data Rates for Global Evolution.
Edge Protection - Barriers used in construction, road, and event safety to prevent workers and pedestrians from falling over the edge of a surface.
Egress - Right-of-way to line route, the action of going out or leaving a place. Egress is a term typically included in rescue or escape plans when working in confined spaces.
EIA - Electronic Industries Association.
Electric Arc - An electrical breakdown of a gas that produces an ongoing electrical discharge. Often used as a method of welding.
Electric Field Strength - The given strength or magnitude of the electric field expressed in units of volts per meter (V/m).
Electrolytes - A small electrical charge carried in certain minerals (sodium, potassium, calcium, etc) that interacts with cells, nerves, and tissues in the human body to provide the electrical current needed for many automatic processes. Electrolytes are lost when the body sweats and the most common way to replace these are with specially formulated drinks.
EME - Electromagnetic Energy
EMF - EMF or electromotive force is a measurement of the electric force that causes or tends to cause current to flow through a circuit (denoted and measured in volts).
EMI - Electromagnetic Interference
Endless Round Sling - An endless round sling (also referred to as a polyester sling or softsling) is a continuous loop of material, typically 100% polyester. It is most commonly used in lifting & rigging applications or, depending on company policy and preference, can be used in life safety.
Endothermic - A chemical change that absorbs a lot of heat. The opposite of exothermic.
Energized Lines - Electrical conductors that are carrying current (energized) due to an electrical connection to a source of potential different from earth ground. Usually describes a high potential.
Equipment Failure - The point at which the ultimate strength of a piece of equipment is exceeded, causing breakage or separation of component parts.
Excavations - Any opening made in the ground, street, or sidewalk in connection with work being performed, such as holes, trenches, ditches, or tunnels.
Exposed - Exposed circuits or lines means in such a position that in case of failure of supports or insulation, contact with another circuit or line may occur. Exposed equipment means an object or device that can be inadvertently touched or approached nearer than a safe distance by any person.
Exposure - Being in close proximity to an active antenna field. Exposure occurs whenever and wherever a person is subjected to electric, magnetic, or electromagnetic fields or to contact currents.
Exposure Level - The concentration of a hazardous substance that an organism is exposed to during a specific period. See permissible exposure limit.
Extension Cord - An electric cord fitted with a plug at one end and an outlet at the other end. Most commonly used when equipment that needs electricity doesn't have a power cord long enough to reach the outlet in a wall or generator.
Eye and Eye Sling - An eye and eye sling is a "strap" composed of material (most commonly polyester, nylon, or wire rope) that is commonly used in lifting & rigging applications or, depending on company policy and preference, can be used in life safety.
Factory Swage - The process of a manufacturer using hydraulics to create a connection between stainless steel wire rope and a fitting. Commonly used in reference to cable safe climb systems.
Fall Clearance - The height needed to safely arrest the fall of a person at-height. This includes a calculation of a safety factor, including the stretching of fall protection equipment like lanyards.
Fall Edge - The unprotected edge of a walking/working surface or an unprotected opening from which a person could fall to a lower surface or into a hazard.
Fall Indicator - A special piece of material or equipment attached to a larger piece of equipment that is intended to visibly display, typically through deformation, or be revealed in the event the equipment experiences a fall. If a Fall Indicator is revealed, the equipment must be destroyed and removed from service.
Fall Protection Lanyard - Short sections (commonly 3 to 6-feet) of cable or webbing that attach to a worker's harness on one end and anchorage point on another. See Shock Absorbing Lanyard, Positioning Lanyard, Single Leg Lanyard, and Twin Leg Lanyard for more details.
Fall Protection Procedure - A written series of logical steps that describes in detail the specific practices, equipment, and methods to be used to protect authorized persons from falling when exposed to fall hazards.
Fall Rated Carabiner - A carabiner that meets or exceeds the ANSI Z359.1 rating which establishes that a carabiner gate, side load, and minor axis should be rated to 3,600 lbs and major axis should be rated to 5,000 lbs. The gate rating should be stamped on the gate and the load rating should be stamped on the long axis.
Fall Restraint - A fall restraint system prevents a worker at-height from falling. This is done by using equipment, like a lanyard, to connect a worker to an anchor that prevents them from reaching an area where the risk of a fall exists. Stage 3 of the Hierarchy of Fall Protection.
Far Field - The portion of the electromagnetic energy field where the electric and magnetic components of the electromagnetic wave are in an orthogonal, or right angle relationship.
Far Field Region - The region of the field of an antenna where the angular field distribution is essentially independent of the distance from the antenna. In this region, also called the free space region, the field has a predominantly plane wave character, i.e., locally uniform distributions of electric and magnetic field strength in planes transverse to the direction of propagation.
Fatigue - As applied to wire rope, the term usually refers to the process of progressive fractures resulting from the bending of individual wires. These fractures may and usually do occur at bending stresses well below the ultimate strength of the material; it is not an abnormality although it may be accelerated due to conditions in the rope such as rust or lack of lubrication. Fatigue can also refer to physical tiredness of a worker due to dehydration, over exhaustion, heat or cold exposure, or other factors.
FCC - The Federal Communications Commission. The organization that is responsible for enforcing the laws written for the regulation of radio communications.
Feasibility Structural Analysis - A preliminary review to determine the overall stability and the adequacy of the main structural members of an existing structure to accommodate a proposed change in condition.
Federal Aviation Administration (FAA) - The Federal Aviation Administration of the United States is a national authority with powers to regulate all aspects of civil aviation. Most commonly their involvement in at-height industries has to do with requirements and regulations for tall structures like telecom towers. Their power also expands to shorter structures that are in close vicinity to airports.
Fiber Optic - A medium resembling cable that consists of thin flexible fibers with a glass core which transfers light signals (data) with very little loss of strength. Most commonly used for internet and mobile infrastructure applications.
Fiber Testing - Evaluating the performance of fiber optic components including cable coverings, connection points, and cleaning equipment.
Field (Physics) - In physics, a space within which magnetic or electrical lines of force are active. A mathematical specification of a physical quantity of electric charge density.
Figure Eight - A belay or controlled descent device, usually constructed from metal, typically aluminum, in the shape of an 8 with one large end and one small end. This piece of hardware uses a large surface area in contact with a climbing rope to provide sufficient friction along with proper technique to control the descent or lowering of a worker.
Fire Extinguisher - A portable device that discharges a jet of water, foam, gas, or other material to extinguish a fire. Fire extinguishers have different classifications and ratings based on the size of the extinguisher and the types of fires that can be put out.
Fire Extinguisher Ratings - Fire extinguisher ratings (also referred to as UL ratings) are a numerical rating that shows the extinguishing power of the fire extinguisher for various types of fire.
Fire Watch - The sole activity of observing and responding to fire hazards associated with hot work. No other duties may be assigned to a worker when performing Fire Watch. This personnel must continue their fire watch duties a minimum of 30 minutes after hot work is complete.
First Aid Kit - A bag or case that contains medical supplies. ANSI has classifications for first aid kits that denote what kits are acceptable to be used in specific situations.
Fit Test (Respirator) - A respirator fit test is a test that ensures a respirator properly fits the face of the person wearing it. The test is done by securing the respirator to the face and placing a hood over the head. Then a second person sprays a bitter or sweet solution into the hood. If you can test the solution the respirator must be re-adjusted and the fit test performed again.
Fixed Body Belt - A belt used by utility lineman that does not allow any movement of the hip D-rings along the belt. A body belt also has accessory loops and connection points for tools. Semi-Floating and Full Floating Body Belts are also available.
Flag (Lifting & Rigging) - A marker placed on a rope making it easier to locate the load position.
Flagger - A person or people on a construction site who control traffic. The people along roads and highways who help traffic keep flowing through construction zones, despite shutdown lanes. They often work in teams, with each person controlling the flow of traffic in a certain direction.
Flame Retardant - A chemical that has been added to an otherwise flammable material to make them flame resistant.
Flares - Indicates flares, torches, fuses, red lanterns, reflectors, or any other equipment that is adaptable for the purpose intended.
Fog Off (Eyewear) - Fog Off is a brand name anti-fog technology that can be applied to lenses that prevents fog from distorting the wear's view.
FPS - FPS (Foot Per Second) expresses the distance in feet traveled or displaced by an object divided by the time in seconds. Commonly used in fall protection when referring to the rate at which an object or person falls and triggers their fall arrest system.
FR (Flame Resistant) - The characteristic of a material not igniting and burning in air. Commonly confused with Flame Retardant.
Fraying - Description of the exposed and broken threads on damaged woven material such as webbing, rope, and cloth.
Free Climbing - Climbing on a tower or structure without any positive fall protection in place.
Free Fall - The act of falling before a personal fall arrest system begins to apply force to arrest the fall.
Free Fall Calculation - A calculation used to determine the total vertical distance traveled in the event of a fall. This number is achieved by adding the free fall distance, deceleration distance, height of dorsal D-ring, the harness stretch and dorsal D-ring shift, and a safety factor.
Free Fall Distance - The vertical distance a person falls from the moment the fall occurs until the moment their fall arrest system activates.
Frequency - Regarding radio transmissions, the number of times a radio wave passes through one cycle. The "frequency Spectrum" is divided into sections, alloted by Federal license to various users. Different frequencies have different behaviors.
Full Body Harness - See Body Harness.
Full Floating Body Belt - A belt used by lineman that allows full travel of the hip D-rings along the belt. A body belt also has accessory loops and connection points for tools. Semi-Floating and Fixed Body Belts are also available.
Galloping (Guy Wire) - A term used to describe the whipping action of excessively loose guy wires, usually wires with tension set at less than 8% of working strength.
Galvanized Steel - Steel that had a zinc coating applied to prevent rust. Hot-Dip galvanizing is the most common method for this process.
Gasoline - A refined petroleum that is used as a fuel for internal combustion engines.
Gate Strength - The amount of force the gate of a carabiner, snaphook, rebar hook, or other connector can handle before it fails. This strength rating, usually presented in lbs, kN, or m, should be stamped on the gate to stay in compliance with ANSI Z359.1.
Gauntlet Cuff - An extended cuff on gloves that provides additional wrist and forearm protection. Gauntlet cuffs are often 4.5 inches longer than a standard glove and are typically found on leather work gloves, welders gloves, or gloves for chemical protection.
Gear Experts® - The exclusive status of GME Supply team members. This term denotes that each and every GME Supply team member has extensive industry know-how and will provide unmatched customer service, prompt delivery, and continued innovation for all of our customers. The industry knowledge of Gear Experts® ensures that our team has the ability to get you exactly what you need, when and where you need it.
Generator - A gas or diesel powered device which provides power when no electricity is available on a jobsite. Also used for emergency backup power to keep equipment functioning during a power outage. Typically on site at telecommunications towers to maintain network service.
GFCI (Ground Fault Circuit Interrupter) - A fast acting circuit breaker designed to shut off electric power in the event of a ground-fault within as little a 1/40 of a second. Most commonly used on construction sites in conjunction with corded power tools.
Gin Pole - A lattice device used to erect towers, typically 200 feet or taller. This device is attached to a tower, and slid to a taller height than the tower during erection, providing additional head room. Cables and rigging are attached to the gin pole, which is then used to hoist tower sections and other accessories into place.
GLONASS - Global Navigation Satellite System is a Russian space-based satellite navigation system operating the radionavigation satellite service. It provide an alternative to GPS and is the second navigational system in operation with global coverage and comparable precision to that of GPS.
GPS - GPS, or the global positioning system, is a group of approximately 30 satellites that are positioned in earth's orbit to allow people on the ground with equipment to pinpoint their geographic location.
Griphoist - A grip hoist differs from a traditional hoist because there is typically not a rotating drum. A grip hoist functions by locking a set of jaws on the wire, then pulling the rope back, handing the wire off to a second set of jaws, and pulling the rope back again, similar to how someone might pull a rope hand over hand.
Grommet - A small piece of material (usually metal or plastic) placed in a hole in a material to protect or insulate a rope or cable passed through it or to prevent the material from being torn.
Grounding - A safety measure used to help prevent people from accidentally coming in contact with electricity. Can be done in the form of above ground wiring, or by rerouting electricity back into the earth.
GSM - Global System for Mobile Communications. One of three different technologies used to broadcast signals between towers and wireless telephones in a PCS or Cellular telephone system. The other technologies are TDMA and CDMA.
Guardrail - A rail used to prevent people from falling off of a structure. Guardrails are considered part of fall prevention.
Guy Grip - See Wire Pulling Grip.
Guy Wire - Guy wire (also referred to as guy line, guy rope, guy cable, or guy) is a tensioned cable designed to add stability to a free standing structure. Commonly used in the wind, telecom, and utility industries.
Guyed Tower - A lattice tower with guy wires or wires to support the structure vertically. Typically used where heavy loads are required and land is plentiful.
H2S (Gas) - Hydrogen sulfide is a colorless, flammable gas. It is extremely hazardous and has a "rotten egg" smell. It occurs naturally in crude petroleum and natural gas.
Hairpin - A device used to hold and provide adjustment on a guy wire at the anchor point. Typically found on large-scale towers.
Half Hitch - A common knot used in rigging. Mandatory for tower climbers to know how to tie.
Half Power (Beamwidth) - In a plane containing the direction of the maximum lobe of an antenna pattern, half-power is the angle between two directions in which the radiated power is one-half the maximum value of the lobe.
Halogen - Elements occupying group 17 of the periodic table. Commonly used in lamps and radiant heat sources that contain a filament surrounded by the vapor of iodine or another halogen.
Hard Hat - A hat that is made of a rigid or strong material used in industrial applications to protect workers from head injuries caused by falling or dropped objects. Also referred to as safety helmet or helmet.
Haul System - A haul system is a combination of ropes, carabiners, and pulleys that offers a mechanical advantage to make lifting and hauling easier in rescue and evacuation situations, when tensioning lines, or other rigging situations. Haul systems often come pre packaged with all of the equipment needed to utilize the system.
Hazard - A danger or risk. In the at-height industry it most commonly refers to equipment and/or situations that can cause injury or death.
Hazard Assessment - The act of detecting either real or potential hazards through the use of a recognized procedure.
Hazard Elimination - The act of completely removing a hazard via construction or maintenance. For example, fixing a hole in the outer wall of a building. Once it has been fixed no one can fall out of the hole. Stage 1 in the Hierarchy of Fall Protection.
Headache Ball - Item used as a counter weight at the end of a cable or rope to bring the weight of the cable down a tower. A slang term for the heavyweight used to draw a rigging line back to the ground. May or may not have a hook or block assembly included.
Headache! - A term often used by tower hands to warn ground men of falling objects.
Heat Treating (Hardware) - A metalworking process used to change physical and/or chemical properties of a material. Heat treating is most commonly associated with metals.