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If you are doing this you are effectively limiting your main panel to 100 A with normal duty cycles. This can get complicated and an electrician is advised. But basically you have a 100A breaker that would typically be for 220-240 volt service and you would connect to the main of the second panel. The size of the wire between the two panels would have to be sized correctly and you would only bond ground and neutral at the main panel and not the branch panel. You might want to move some of the loads from the main panel to the branch depending on load calculations. If you know what you are doing and have access to a clamp on amp meter you could measure how much of the 200 Amps you are using at the current panel. This can be dangerous, so get an electrician or be careful.


In the trade this is called a sub panel. It is a complicated job in as much as you have to know wire sizes, ampacity of wires and proper electrical workmanship. Such a project should be left to a licensed electrical contractor to take out the proper permits and call for proper inspections. By taking this route it will leave you confident that if any mishaps happen to the installation down the road your insurance company will be behind you 100%.

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โˆ™ 2010-03-19 03:14:06
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Q: 200 amp main and would like to add another 100 amp service in another room how can you do this?
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How do you determine if you have 100 or 200 amp service?

Look at the value of the breaker or fuses that control your main electric panel. look at the wire size coming in to the main lugs on service panel, I am assuming you don't have a main breaker or you would look at the breaker rating to determine service size. 2/0 copper or 4/0 aluminum service size 200 amps, #4 copper or # 2 aluminum 100 amp.

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Do you need a main dissconnect for a 400 amp 3 phase service?

No, you can use the six main rule. This means you would have a 400 amp main lug panel, with six breakers or less, but no more than six. You can also use six individual disconnects.

How do I know how many amps my electrical service is?

There should be a marking on your main breaker next to the meter, you might not have a main at all though. Also look at the size and type of the wire copper or aluminum. find that and ask another question or your local hardware store has a chart in the wire section. Most normal size houses are 200, 225, or 250 amps. older smaller houses usually 100 amps. My house was buit in 1970 is 2,000 square feet and has a 150 amp service. Today the same house would not have anything less than 200 amp service.

What is the maximum number of circuit breakers that may be used in the main service panel without a main switch?

Panels without mains may have up to 6 breakers.

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