Note: View additional wire size charts from the list below. Wire Size Chart and Maximum Amp Ratings Source: NFPA 70, National Electrical Code, Table 310.15(B)(16) SIZE Generally, experts recommend using a 8 AWG copper wire or a 6 AWG aluminum wire for grounding and bonding in a 100 amp service. Such as wire, tools, extension cords, and accessories. When it comes to a 100 amp service, you’ll need to determine the appropriate size for your ground wire. Search Amazon for your Electrical products So, don’t need a 125 amp wire to wire it we need a 100. That means that a 125A breaker can only be loaded up to 80 of its capacity that’s 100 amps. Note on 125 amp breaker wire size: For breakers, we use the 80 NEC rule. This wire has 135A ampacity more than the minimum required 125A ampacity. The wire size chart below shows allowable ampacities of insulated conductors rated up to and includingĢ000 Volts, 60☌ through 90☌ (140☏ through 194☏), not more than three current-carryingĬonductors in raceway, cable, or earth (directly buried), based on ambient air temperature of 30☌ (86☏). 2/0 AWG aluminum wire for 125 amp service. Basically, you need a 2 AWG copper ground wire for a 200 amp service. The number of devices connected to the circuit usually determines how much current will flow through the wire. If you consult the copper ground wire size chart above, you can see that you will need a 2 AWG copper ground wire to adequately ground a 250 kcmil wire. It is important to pick the correct size of wire so that the wire doesn't overheat. Limit that a wire can handle before damage occurs. Each wire size, or wire gauge (AWG), has a maximum current
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