Copper equipment grounding conductors are no longer required for agricultural buildings, marinas and boatyards. Article 547 Agricultural Buildings 547.5 Wiring Methods (F) Separate Equipment Grounding Conductor. An equipment grounding conductor for circuits in agricultural buildings must be insulated or covered when installed underground (Fig. 33). Analysis: After studying the corrosive effects of the various items found in agricultural buildings (methane gas, ammonia, carbon ...

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