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.
(3) Bonding of Electrical Equipment. Noncurrent-carrying conductive materials enclosing electrical conductors or equipment, or forming part of such equipment, must be connected together and to the grounded (neutral) terminal at the electrical supply source in a manner that establishes an effective ground-fault current path. Figure 250–5
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