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If a main has two 100A circuits does that mean it is 200A service?


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Wiki User
2017-02-17 17:31:59
2017-02-17 17:31:59

What you are looking at is a two pole 100 amp breaker. Distribution panels in North America are designed to use 120/240 volts. Any two adjacent breakers will give you a 240 volt circuit and either leg to the neutral will give you 120 volts.

On the main breaker of a panel the number stated on the breaker is the amount of amperage that the breaker will allow to pass before tripping regardless of which leg the current passes through.


A 200 amp service will have a two pole main breaker with a rating stating its capacity of 200 amps.


Wire size into the breaker will give you a good clue as 100 amp breakers will use a #3 conductor whereas a 200 amp breaker will be fed with a 3/0 conductor.


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Wiki User
2015-07-15 19:32:17
2015-07-15 19:32:17

No it does not mean you have a 200 amp service. you should / could possibly have a "main" breaker. That breaker size is your service size.

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The meter is typically installed in the main circuit panel of the house. If you want to move it, you can do it as part of a service / panel upgrade. We did this when we moved into our new house - we replaced the 1950s vintage main circuit panel and 100A service with a newer 200A panel and service. It was about a grand, but we didn't actually move the panel from where it was, so it may cost more for what you want.

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4 gauge AWG copper minimum. Use this:http://www.electrician.com/vd_calculator.htmlI found this invaluable when wiring our outbuildings. This one puts out the wire size:http://www.alternate-energy.net/voltlosscalc03.html

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A #1 aluminum wire with a insulation factor of 90 degrees C is rated at 105 amps. Three #1 wires can be installed into an 1 1/2" conduit.


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