Secondary grounding of industrial distribution boxes

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26 mm 2 (10 AWG) ground wire must be used, and in all other markets a 6 mm 2 must be used. Grounding is a mechanism to protect distribution equipment and people under normal operating conditions, abnormal operational (overcurrent and overvoltage) responses, and hazardous conditions such as shocks. Solidly grounded systems create fatal and costly arc-flash hazards that cause substantial damage at the fault location. The recommended practices in this document are intended to provide explanations of how electrical systems operate. The voltage, system arrangement, loads connected, and continuity of service drive grounding requirements and design choices.

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