Electrical · E-E47B9

Main Distribution Switchboard (4D1)

Materials

Connections

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The main distribution switchboard is configured with a two thousand ampere, 480Y/277 volt, three-phase, four-wire setup in a NEMA 1 enclosure. A main bonding jumper is sized per National Electrical Code Table 250.102(C)(1) connecting neutral and ground. A grounding electrode conductor is provided per National Electrical Code Table 250.66. Connection to the main water pipe utilizes an exothermic weld or other approved method.

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