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

  • Q:

    What wire size is required for a 200amp service at a distance of 180 feet?

    A:

    The required copper wire size for a 200amp service of 120v/240v at 180 feet is 3/0. The choice to use aluminum conductors is often made because of a significant cost difference compared to copper, however the conductor size is larger, in this scenario #250 aluminum conductors would be needed.

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  • Q:

    What are some electrical panel codes?

    A:

    National codes for electrical panel include using anti-oxidant compound on aluminum conductor terminations, and allowing adequate working space around live parts that carry up to 150 volts. Code 240-24 states that electrical panels shall not be located in bathrooms or close to materials that ignite easily. Article 408 in the code outlines the requirements for switchboards and panels. Local building authorities can provide complete information on electrical codes for the area.

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  • Q:

    How do you use a wire gauge amp chart?

    A:

    Use a wire gauge amp chart to determine the approximate wire size for an electrical load. There are separate charts for different types of wire. Since the resistance of electricity is dependent on several factors, the chart cannot give the exact size for every application. In the United States, wire is sized using the American wire gauge system.

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  • Q:

    What is fuse wire made of?

    A:

    A fuse is a strip of metal or a wire constructed of copper, zinc, silver or aluminum. Some fuses are made of alloys of these metals. Some fuses use two strips with one designed to melt quickly to prevent a short circuit and another designed to fail in the event of a long-term overload.

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