We will show you how this 250A ampacity is calculated. The 250 KCMIL wire is the perfect size wire for 200 amp service because it has 255A ampacity (a minimum of 250A ampacity requirement is satisfied). Here is a shortlist of KCMIL wires that can be used for 200 amps: KCMIL wires are bigger and can handle currents of 200 amps and higher. You have to go beyond the AWG chart at look at the KCMIL wire chart. Looking at the AWG wire chart, you will need an even bigger than #0000 AWG wire for 200 amps. In the case of 200 amps breakers, this means you will need a wire with at least 250A ampacity to connect a 200 amp service. This is known as NEC 80% requirement for wire sizing. Maximum loading for any branch circuit is 80% of the rating of the circuit for ampacity of wire for any load. That, however, will likely end with you frying the wire.įor safety measures (in order to avoid frying a 200 amp circuit), the National Electric Code (NEC) dictates the following requirement: If you look at the AWG gauge wire chart here, the answer seems to be quite clear (it’s not that simple, however):Īs you can see, the obvious – but wrong – the choice is using a #000 AWG wire for 200 amp service (also known as 3/0 AWG) because it has a 200A ampacity. What size wire do I need for 200 amp service? The common question for all these applications here is this: They can be used as 200 amp ground wires, wires for 200 amp breaker, they can be copper or aluminum 200 amp wires.
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