How many grounding wires are there in the secondary distribution box

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 Substation normally use 4 wire, multi-ground Y configurations to distribute power (feeders) to the secondary systems. 26 mm 2 (10 AWG) ground wire must be used, and in all other markets a 6 mm 2 must be used. Grounding of the units: Attach a ground wire from one of the threaded studs (A) at the bottom of the housing, to the mounting plate (B). Safety of Personnel: By safely channeling fault currents into the ground, proper grounding helps to reduce the risk of electric shock to personnel. For some perspective, 1200 kcmils is almost 1 square inch of cross-sectional area, a very large wire.

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