In temporary installations, receptacles shall not be connected to the same ungrounded conductor of multiwire circuits that supply ___.

In temporary installations, receptacles shall not be connected to the same ungrounded conductor of multiwire circuits that supply ___.

• A. Ground-fault receptacles
• B. Temporary lighting
• C. Emergency lighting
• D. Motors

Answer: (B)

In a multiwire branch circuit, the ungrounded conductors share a neutral, so the two hots must be treated as a tied pair and can require a simultaneous disconnect. In temporary installations, it’s unsafe to have a receptacle fed from the same ungrounded conductor that also supplies the temporary lighting circuit. The reason is that on a site with changing loads and configurations, a receptacle could remain energized or become energized under conditions where the lighting circuit is off or altered, creating a shock hazard through the shared neutral or unexpected backfeeds. To minimize this risk, receptacles should not be connected to the same ungrounded conductor of a multiwire circuit that supplies temporary lighting.

In a multiwire branch circuit, the ungrounded conductors share a neutral, so the two hots must be treated as a tied pair and can require a simultaneous disconnect. In temporary installations, it’s unsafe to have a receptacle fed from the same ungrounded conductor that also supplies the temporary lighting circuit. The reason is that on a site with changing loads and configurations, a receptacle could remain energized or become energized under conditions where the lighting circuit is off or altered, creating a shock hazard through the shared neutral or unexpected backfeeds. To minimize this risk, receptacles should not be connected to the same ungrounded conductor of a multiwire circuit that supplies temporary lighting.