# Thread: 200 amp service

1. Junior Member
Join Date
Jul 2009
Location
Springfield, IL
Posts
1

## 200 amp service

I have 200 amp service and I am planning on adding a bathroom that will contain it's own electric hot water heater. My breaker box is full (short box), what size of breaker do I need for the hot water heater and how do I know if I have enough service left to run a subpanel for the new addition?

2. NEC
Banned Rank 2
Join Date
Feb 2009
Posts
693

## Re: 200 amp service

Probably a two pole 30A breaker for the water heater.

You can run a load calculation for the house.

Here is a calculator. Just follow the directions.

http://www.electricalknowledge.com/SFDLoadCalc.asp

(The calcs are for electricians, But, I think easy enough to understand. Please let me know a question or problem with them.)
Last edited by NEC; 07-28-2009 at 09:31 PM.

3. Banned Rank 2
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Jun 2007
Location
Shamokin, Pa.
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## Re: 200 amp service

Originally Posted by pana8432
I have 200 amp service and I am planning on adding a bathroom that will contain it's own electric hot water heater. My breaker box is full (short box), what size of breaker do I need for the hot water heater and how do I know if I have enough service left to run a subpanel for the new addition?
In the commonwealth here {Pa.** you are allowed to add a 100 amp sub panel. Just wondering what you mean by a {short box**,though.

4. NEC
Banned Rank 2
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Feb 2009
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## Re: 200 amp service

Originally Posted by Ernie_Fergler
In the commonwealth here {Pa.** you are allowed to add a 100 amp sub panel. Just wondering what you mean by a {short box**,though.
Guess less than 42 circuits........... 42 circuit requirement was lifted in the 2008 NEC. About time.

5. Banned Rank 2
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Location
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## Re: 200 amp service

Originally Posted by NEC
Guess less than 42 circuits........... 42 circuit requirement was lifted in the 2008 NEC. About time.
That was my thinking as well NEC. And also always wondered about reasoning pertaining to that in the code as well.

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