Q:

What is the wire size for 200 amp service?

A:

Quick Answer

National Electric Code 310-315 specifies electrical services wire conductor sizes of #2/0 for copper and #4/0 for aluminum for use in 120/240 volt 3-wire, single-phase dwelling services and feeders. NEC requires a minimum of 100-amp 3-wire service for a single-family dwelling unit.

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Full Answer

Two-inch conduits are used to hold the copper and aluminum wires for 200-amp electrical service. In addition, a #4 bare copper conductor is used for the connection between the ground rod/plate and the neutral connection block of the distribution panel for a 200-amp service. A 165- to 200-amp fuse is used on the service entrance wire at the main service panel.

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Related Questions

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    Where do you find a wire size vs. amps chart?

    A:

    Cerro Wire, PowerStream Technology and Armstrong's Supply Company's websites are some online resources that provide wire size vs. amps charts. Cerro Wire provides a chart of different wire gauge sizes and amp ratings for both copper and aluminum wire at different ambient temperatures.

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    Is the black electrical wire positive or negative?

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    The black wire is used in all electric circuits and is always the "hot" or live wire. It usually runs from the switch to the electrical load.

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    When choosing the correct electrical wire, it's important to consider what the wire is feeding, the wire gauge and the wire capacity, states About.com. In general, smaller gauge wires have higher ampacity, which is the maximum amount of electrical current the wire can handle without sustaining damage.

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    How do you install 100-amp service?

    A:

    A 100-amp main breaker panel receives 100-amp service at 240 volts. Electricity enters the home via the meter socket and service-entrance wire. Two-gauge, three-conductor aluminum SER wire is an appropriate 100-amp service-entrance wire. The service-entrance wire runs from the meter socket outdoors to the main breaker panel indoors, delivering the 100 amps of electricity.

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