![]() ![]() They can be safely used with a 100-amp sub-panel if the proper gauge is selected. Aluminum wires tend to be less costly but are not as efficient. It has a higher tensile strength (meaning it’s less prone to breakage) and is more conductive than aluminum. Should I Use Copper Wire or Aluminum Wire?Ĭopper wire is most often used for residential sub-panels and other electrical components. This number is usually indicated by a label found on the wire coating or insulation. The smaller the gauge, the thicker the wire, and the more amperage it can support. The gauge number refers to the thickness of the wire. A #14 AWG wire is typically acceptable for a circuit with general lighting and electrical receptacles. A #10 AWG wire may be used for a 30-amp appliance while a #8 AWG wire can accommodate a 45-amp appliance. How a Sub-Panel Wire Differs from Standard Home Wiringįor any wire, the proper size is determined by the circuit’s amp rating and type of electrical installation. The sub-panel contains circuit breakers serving areas like a garage, home addition, or shed. The wire connects the sub-panel to a main feeder breaker disconnect, which is connected to a 200-amp meter box. #2/0 AWG copper or #4/0 AWG aluminum wire for a 200-amp sub-panel.#1/0 AWG copper or #3/0 AWG aluminum wire for a 175-amp sub-panel.#1 AWG copper or #2/0 AWG aluminum wire for a 150-amp sub-panel.#2 AWG copper or #1/0 AWG aluminum wire for a 125-amp sub-panel.#3 AWG copper or #1 AWG aluminum wire for a 110-amp sub-panel.However, wiring requirements change depending on the sub-panel’s capacity. The minimum conduit size is 1.25 inches and a schedule 40 or 80 PVC electrical conduit is specified for lines run underground. If using an aluminum or copper-clad aluminum wire, a #2 AWG wire can be used. The National Electric Code (NEC) requires a #4 American Wire Gauge (AWG) copper wire for sub-panels. Wiring Requirements for Electrical Sub-Panels For copper, you will need a 4-gauge wire for a sub-panel. The right type of wiring must be used as well. The panel should be rated at least 100 amps and you’ll need a permit to perform the work (which generally requires an electrician ). There are lots of requirements to install one. Should I Use a 4 Gauge Wire for a Sub-Panel?Īn electrical sub-panel may be used for a room addition or detached garage. ![]()
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