Electrical · E-8RNQC

Transformer Separately Derived System Grounding Diagram

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A transformer separately derived system ground diagram shows the primary supply connecting to the transformer with a primary feeder grounding conductor sized per the one-line diagram. A bonding jumper connects the neutral bar to the transformer housing and grounding electrode conductor. The grounding electrode conductor links to a grounding electrode, which utilizes an available local electrode within twenty feet or a three-quarter-inch diameter by ten-foot-long copper-clad steel ground rod connected via a listed ground clamp. All sizing and installation methods comply with National Electrical Code sections 250-30, 250-62, 250-64, 250-66, and 250-92.

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