250.4 General Requirements for Grounding and Bonding
Section 250-2 in the 1999 NEC was revised and relocated to 250.4. It now reads:
(A) Grounded Systems.
(2) Grounding of Electrical Equipment. Noncurrent-carrying conductive metal parts of the electrical system in a building or structure must be connected to earth for the purpose of limiting the voltage imposed by lightning, line surges, or unintentional contact with higher voltage lines, by shunting the energy to the earth. Figure 250–4
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