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Old 1/25/19, 10:49 AM
jolson8 jolson8 is offline
Certified Professional Inspector (CPI)
Join Date: Aug 2014
Location: De Pere Wisconsin
Posts: 1,270
Default Re: 3 vs 4 wire feed to garage

Originally Posted by Robert Meier View Post
Up until the 2008 NEC code cycle 3 wire feeders were permitted if there were no metallic paths between the two structures. From 2008 and beyond a 4-wire feeder is required. If there is an old 3-wire feeder you must bond the neutral just like in a service and connect the GEC from your grounding electrodes to the neutral.

With a 4-wire feeder the EGC's and neutrals are separate and the GEC goes to the EGC bus which is bonded to the enclosure, the neutral is left floating.

In a 3-wire sub(distribution) panel the grounds and neutral should not be separated?