GROUNDING OF SYSTEMS


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GROUNDING OF SYSTEMS
GROUNDING OF SYSTEMS132. Grounding of distribution circuits. The National Electric Code requires that on systems supplying interior-wiring circuits one wire of the circuit shall be grounded, provided that the voltage from any other conductor to ground will not exceed 300 V on dc systems or 150 V on ac systems. Grounding helps to prevent accidents to persons and damage by fire to property in case of lightning, breakdown between primary and secondary windings of the transformers, or accidental contact between high-voltage wires and low-voltage wires. If some point on the low-voltage circuit is grounded, (1) lightning striking the wires will be conducted into the ground, and (2) breakdown of the transformer insulation between primary and secondary coils will reveal itsel…
Citation
Terrell Croft; Frederic P. Hartwell; Wilford I. Summers: American Electricians' Handbook, Sixteenth Edition. GROUNDING OF SYSTEMS, Chapter (McGraw-Hill Professional, 2013), AccessEngineering Export