Does the National Electrical Code (NEC) permit multiwire branch circuits to supply freestanding office partitions? I would like to use three-phase, four-wire branch circuits, consisting of 3-12 AWG copper conductors with a 10 AWG neutral supplied from a 208Y/120 volt system. Are three-phase, single-pole circuit breakers acceptable? The wiring method is flexible metal conduit. Fixed-type partitions and freestanding partitions are allowed to be connected to multiwire branch circuits where all ungrounded conductors of the branch circuit can be disconnected simultaneously from the panelboard where the branch circuit originates. This applies to partitions that are connected to the wiring system by one of the wiring methods recognized in Chapter 3. Freestanding partitions connected to the wiring system in the building through a cord-and-plug connection are not permitted to be supplied by multiwire branch circuits. These rules are in 605.6, 605.7 and 605.8.
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