(B) Circuit Breaker as Overcurrent Device. Use of single-pole circuit breakers as the disconnecting means.Īnd 240.15(B) (specifically, 240.15(B)(1)): Informational Note: See 240.15(B) for information on the Shall be provided with a means that will simultaneouslyĭisconnect all ungrounded conductors at the point where In any case, identified handle ties need to be used in order to provide the 'common disconnecting means' required by 210.4(B): And all three of these need handle tying to be compliant Fortunately, this mistake won't fry any equipment, but that's only because the second receptacle only gets the second leg's hot. So forth, where the removal of such devices would interruptĪs removing the first receptacle of the circuit leaves the second receptacle sans neutral. In multi wire branch circuits, theĬontinuity of a grounded conductor shall not depend onĭevice connections such as lampholders, receptacles, and Method 2, however, violates NEC 300.13(B) as described: (NB: All quotes here are from the 2014 NEC, but I know of no significant changes to these passages between 20.) Methods 1 and 3 are fine.įor a 15A MWBC, both wiring method 1 and wiring method 3 will work and are Code-compliant as described, insofar as the receptacle wiring goes. Based on other issues I have found, I have a suspicion that the wiring is not compliant with the current National Electrical Code. While adding a new outlet, I noticed that the existing panel makes extensive use of 14/3 NM-B cable where the black wire is connected to one 15 amp single pole breaker, the red wire is connected to a second 15 amp single pole breaker, and the handles of the two breakers are not tied together. Reason for question: I recently assumed responsibility for maintenance in a small office building that was constructed in the late 1990s or early 2000s. Please reference and/or quote the National Electrical Code. White wire pigtailed to the top silver screw terminals of both receptacles.Tab connecting the two silver terminals intact on both receptacles.Tab connecting the two brass terminals intact on both receptacles.Ground wire pigtailed to the green screw terminal of both receptacles.Separate insulated white wire from the bottom silver screw terminal of the first receptacle to the top silver screw terminal of the second receptacle.White wire to the top silver screw terminal of the first receptacle.Red wire to the top brass screw terminal of the second duplex receptacle.Black wire to the top brass screw terminal of the first duplex receptacle.

Two duplex receptacles in a two-gang electrical box.Tab connecting the two silver terminals intact.Tab connecting the two brass terminals broken.Ground wire to the green screw terminal.White wire to one of the silver screw terminals.Red wire to the bottom brass screw terminal.Black wire to the top brass screw terminal.Single duplex receptacle in a one-gang electrical box.Are any of the following acceptable according to the National Electric Code? If so, do the handles of the two circuit breakers need to be tied together using a handle tie approved by the manufacturer of the circuit breakers? The black wire is connected to one 15 amp single pole circuit breaker and the red wire is connected to a second adjacent 15 amp single pole circuit breaker. A 14/3 NM-B cable is run from the main breaker panel.

3 pole 15 amp breaker