Understanding Grounding, Pt 1: Systems & Services - DVD #8
Understanding Electrical System Grounding, System Grounding vs. Equipment Grounding, Current Flow in a Grounding System, Definitions of Grounding Terms, Table 250-66 vs. Table 250-122, Grounding Electrodes, Ground Rods, Equal Potential Grounding, Sizing of Service Grounding Conductors, Which Electrical Systems Require Grounding, Grounding Services, Service Equipment