200 amp service

• 07-28-2009, 03:02 PM
pana8432
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?
• 07-28-2009, 03:49 PM
NEC
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.

(The calcs are for electricians, But, I think easy enough to understand. Please let me know a question or problem with them.)
• 07-28-2009, 07:27 PM
Ernie_Fergler
Re: 200 amp service
[QUOTE=pana8432;59378]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?[/QUOTE]

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.:confused:
• 07-28-2009, 09:13 PM
NEC
Re: 200 amp service
[QUOTE=Ernie_Fergler;59398]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.:confused:[/QUOTE]

Guess less than 42 circuits........... 42 circuit requirement was lifted in the 2008 NEC. About time.
• 07-29-2009, 05:40 PM
Ernie_Fergler
Re: 200 amp service
[QUOTE=NEC;59401]Guess less than 42 circuits........... 42 circuit requirement was lifted in the 2008 NEC. About time.[/QUOTE]

That was my thinking as well NEC. And also always wondered about reasoning pertaining to that in the code as well.