250. Also, IEEE-142 describes the correct way to provide an isolated ground — and it isn't the method proposed by many equipment manuals. 250. Proper grounding and bonding result in a system that is safe and reliable.

Both of these conductors are bonded to the supply system ground at the service entrance, but they perform radically different functions and should never be interchanged. Grounding (earthing) electrode. They should also never connect to each other, or to the earth, anywhere except at the service entrance.

An electrical panel is installed outside of a dwelling unit and there is a copper ground rod driven into the earth below. The best means of equipment grounding is to route a grounding conductor, suitably sized, along the same route as the power and neutral conductors, from source to machine. In addition, non-current-carrying metallic components in a facility, such as equipment cabinets, enclosures, and structural steel, need to be electrically interconnected so voltage potential cannot exist between them.

– The potential difference across insulation materials is limited. The most common grounding electrode for small facilities is a metallic ground rod, but earthing systems for larger buildings can — and should — be more elaborate and include the means by which to inspect and test these systems periodically. 0000006390 00000 n All rights reserved.

Isolated connections to earth are not required for sensitive machine operation. – Flexible conduit and fittings that are not approved for grounding purposes require a bonding jumper. Equipment grounding conductors can be wires, metallic conduit, electrical tubing, or listed flexible conduit with approved fittings.

trailer Waterer is an Engineering Fellow for Schneider Electric's Square D Engineering Services, Norcross, Ga. All of the metal boxes are now bonded together on this job. The earth is a poor conductor. Your email address will not be published. 0000001775 00000 n Understanding that dilemma is the point of this article. These are two distinct procedures and both are essential when installing metal electrical enclosures, boxes, and equipment within any electrical system.

All wire terminations must be an approved mechanical type or welded. 0000006015 00000 n Grounding diagram for a typical electrical system shows NEC-defined terminology. In this corrective action, the equipment grounding means is removed or nonmetallic spacers are installed in the metallic raceway system contrary to fundamental safety grounding principles covered in the requirements of Art.

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