Q:

Can you use a main breaker panel as the subpanel?

A:

A standard 100-amp load center can be used as a subpanel, according to electrical-online.com. The neutral bonding jumper, however, must be removed. In a subpanel, the neutral must be completely isolated from the ground. When doing electrical work, the power should always be turned off.

Know More

Full Answer

For residential service, the neutral and ground can only be bonded in one location, which must be in the main panel. In most panels, a metal strap or machine screw connects the neutral bus bar to the panel case, or ground. This metal strap or screw must be removed. To make the sub-feed connection, an appropriate size and length cable is run between the main panel and the subpanel. For example, 6-3 NM-B wiring can carry 50 amps at a maximum length of 55 feet. At the main panel, the hot legs of the sub-feed wiring is connected to an appropriate branch circuit breaker, the neutral wire connects to the bus bar and bare grounds to the panel case. At the subpanel end, the hot legs of the sub-feed wiring are connected to an appropriate circuit breaker seated on the panel's hot bus bar. This acts as the subpanel's main breaker via reverse feeding. The bare wire is connected to a case ground lug in the subpanel, and the neutral wire is connected to the isolated neutral bar. Electrical work should always be inspected by a licensed professional.

Learn more in Electrical

Related Questions

  • Q:

    What size breaker would you use on a washing machine circuit?

    A:

    Electrical code calls for a dedicated 20-amp breaker for the laundry room. This circuit provides sufficient power for the washer and a gas dryer. The code allows more than one outlet on the laundry circuit, but it requires all the outlets to be in the same room. If the laundry room has a sink, any outlets within 6 feet of it must include ground-fault circuit interrupter protection.

    Full Answer >
    Filed Under:
  • Q:

    How do you wire a subpanel?

    A:

    To wire a subpanel, first consult with an inspector to ensure the panel does not overload, then turn off the electricity, mount the subpanel box, clamp and pull the wires to the subpanel and connect the new circuits. Use a larger box than necessary so that future circuits can be added.

    Full Answer >
    Filed Under:
  • Q:

    Why does my circuit breaker keep tripping?

    A:

    A circuit breaker trips when the current traveling through the circuit exceeds the rating of the breaker, causing it to become warm and spring open. This occurs when too many electrical devices are plugged into a single circuit. Moving some of the devices to other circuits should relieve the problem.

    Full Answer >
    Filed Under:
  • Q:

    What does a circuit breaker do?

    A:

    A circuit breaker cuts off an electrical circuit in building wiring any time that electrical current goes above a safe level. Its function is similar to a fuse, although circuit breakers can be used more than once.

    Full Answer >
    Filed Under:

Explore