06 System Grounding - Schneider Electric

1 Section 6: System GroundingBill Brown, , Square D Engineering ServicesIntroductionThe topic of System Grounding is extremely important, as it affects the susceptibility of the System to voltagetransients, determines the types of loads the System can accommodate, and helps to determine the systemprotection System Grounding arrangement is determined by the Grounding of the power source. For commercial andindustrial systems, the types of power sources generally fall into four broad categories:A Utility Service The System Grounding is usually determined by the secondary winding configuration of theupstream utility substation Generator The System Grounding is determined by the stator winding Transformer The System Grounding on the System fed by the transformer is determined by the transformersecondary winding Static Power Converter For devices such as rectifiers and inverters, the System Grounding is determined bythe Grounding of the output stage of the A to D fall under the NEC definition for a separately-derived System .

4 section, multi-grounded neutrals in NEC jurisdictions, such as commercial or industrial facilities, are actually prohibited in most cases by the NEC [1].

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