From Lineman's and Cableman's Handbook, Eleventh Edition

Proper grounding for electrical systems is very important for the safety of the linemen, cablemen, groundmen, and the public. Correct operation of protective devices is dependent on the grounding installation. The National Electrical Safety Code (ANSI-C2 Standard) specifies the grounding methods for electrical supply and communications facilities. The National Electrical Code (NFPA-70 Standard) specifies the grounding methods for all facilities that are within or on public or private buildings or other structures.

The grounded static wires for transmission lines and the grounded neutral wire for primary distribution circuits originate at substations. The static wires for transmission lines will normally originate and terminate at a substation. The substation may be located at a generating station.

The substation grounding system governs the proper functioning of the whole grounding installation and provides the means by which grounding currents are conducted to remote earth. It is very important that the substation ground have a low-ground resistance, adequate current-carrying capacity, and safety features for personnel. The substation grounding system normally consists of buried conductors and driven ground rods interconnected to form a continuous-grid network. The surface of the substation is usually covered with crushed rock or concrete to control the potential gradient when large currents are discharged to ground and to increase the contact resistance to the feet of personnel in the substation. Substation equipment should be connected to the ground grid with large conductors to minimize the grounding resistance and limit the potential between the equipment and the ground surface to a...

Products & Services
Grounding Grids
Grounding grids and mats consist of conductive mesh or sheets that act as a multi-potential ground. They are used near pipelines, substations, transformers, large motors, or high voltage power lines to reduce mains hum, provide AC mitigation, and reduce step and touch potentials.
Grounding Indicators
Grounding indicators are used to monitor and verify the presence of grounding systems.
Grounding Straps
Grounding straps are anti-static devices that are used to protect people and electronic equipment from electrostatic discharges (ESD) by routing the electric current to a safe ground.
Grounding Bars and Rods
Grounding bars and grounding rods are electrical connections that divert undesirable current in order to protect humans and equipment.
AC Power Connectors
AC power connectors transfer alternating current through a variety of electronic devices. AC power connectors include simple AC inlets, outlets, and power entry modules.

Topics of Interest

Protection of the lineman is most important when a transmission or distribution line or a portion of a line is removed from service to be worked on using de-energized procedures. Precautions must be...

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Often the least expensive solution to a power quality problem is proper wiring and grounding, and the more expensive solution is the purchase and installation of the power conditioning equipment...

Many transmission and distribution lines are built by contracting companies employing linemen and cablemen. A contract is normally completed between the electric utility company and the contracting...