Question: Where are you required to make the connection between the equipment grounding conductor (EGC) and the neutral conductor at a 208/120V, 3-phase, four-wire service?
See the answer below.
Answer: Within the service disconnect enclosure.
Explanation: Section 250.24(B) requires the main bonding jumper to connect the EGC and the service disconnect enclosure to the neutral (grounded conductor) within the enclosure.
Lupacchino is a senior design engineer with Gaylor Electric, Inc. in Noblesville, Ind. and serves as an alternate on NEC Code-Making Panel No. 3. He is currently licensed in more than 80 jurisdictions. He can be reached at [email protected].