![]() Selecting the right type and size of wire is important in order to ensure a safe and efficient electrical installation. ![]() Factors that determine wire size include the distance between the service panel and the electrical load, the surrounding temperature, and the voltage drop. You’ll need to use 4 AWG wire if the distance between the utility and breaker panel is less than 50 feet. The size of the wire needed depends on several factors, including the length of the run, the amperage rating of the circuit, the temperature rating of the wire, and the presence of any other appliances or circuits that may share the same wire. Most panels require 2 AWG wire for 100-amp service. The National Electric Code recommends that to wire a 100 amp sub panel 300 feet away from the main panel, you should use 2/0-gauge aluminum wire or 4/0-gauge copper wire. Within that, there is a 12 x 20 workshop. 100 feet will be underground and 70 feet will be through the crawlspace underneath the house. Unless youre running a whole bunch of stuff at once, a 60 amp panel should serve you well. I am installing a 100 A sub panel in my barn which is 170 feet from the main panel. 60 ampere panel with 60 ampere main breaker. 6 AWG copper wire (x4) for a run less than 75ft., 4 AWG copper wire (x4) for runs less than 150ft. This article will discuss what size wire should be used for a 100 amp sub panel that is 300 feet away from the main panel and why it is important to select the right size. 60 ampere double pole breaker in the main panel. But when the sub panel is located 300 feet away from the main panel, selecting the right size wire becomes even more important. The wire size needed for a 100 amp sub-panel depends on the distance between the main panel and the sub-panel, as well as the anticipated load that the sub-panel will be handling. An undersized wire can lead to a range of problems from an inefficient power supply to even an electrical fire. When it comes to wiring a 100 amp sub-panel, it’s important to use the correct wire size. ![]() When it comes to wiring a home, the size of the wire used is of paramount importance.
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