Field glossary

MWBC

Multi-wire branch circuit: two opposite-phase hots sharing one neutral, with a simultaneous disconnect

Used across 4 Anvilfield field guides, most in Electrical.

Also defined as

Multiwire branch circuit, ungrounded conductors sharing one neutral, requiring simultaneous disconnect
Multiwire branch circuit, two or three ungrounded conductors on different phases sharing one neutral

Where this shows up