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-   -   Tie into existing bath GFI circuit for new basement bath GFI? (http://www.diychatroom.com/f18/tie-into-existing-bath-gfi-circuit-new-basement-bath-gfi-49746/)

8roty 07-27-2009 06:14 PM

Tie into existing bath GFI circuit for new basement bath GFI?
 
Is it possible to tie in to an existing gcfi circuit when adding a new basement bathroom gcfi? The new gcfi has to be on it's own circuit but can't I share with other gcfi outlets?.... I should be able to tie in to the existing gcfi circuit so I don't have to add 1 breaker for 1 new gcfi outlet. How can I tell if that particular circuit is maxed out? One breaker is labeled as Bath GFI. The kitchen and outdoor GFIs are on other circuits. So with 3 bathrooms upstairs, adding a forth gcfi should be OK. But can it be done? Above the breaker box where the wire comes in for the existing Bath GFI 20 amp breaker/ circuit, can I cut this wire and legally join/ make a new connection and branch to the new run of 12-2 wire to add a new basement bath GFI?

Thanks for your help!

jbfan 07-27-2009 06:51 PM

Turn the breaker off and see if anything other than the bathrooms are affected.
You can do what you want, as long as only the baths are on that breaker.
I would not use that circuit if it was me.

8roty 07-27-2009 10:12 PM

I'm confident that only the bath GFI's are on that circuit. I already turned off that breaker and all bath lights remained on. So if I were to tie in the new bath gfi, I would need a junction box above the panel.

Do you recommend I take the existing wire coming through the sub-floor, extend with a junction box and run out to the new GFI and then return to the breaker?

or

Do I use the junction box and branch to a new run out to the new bath GFI ending at the GFI outlet?

Scuba_Dave 07-27-2009 10:15 PM

If you have 3 bathrooms already being supplied by that circuit there is no way I would add a 4th bathroom :eek:

InPhase277 07-27-2009 10:39 PM

I don't know. In the average house, I'd say it's a stretch to assume that even two baths will be drawing a large load at the same time, and it would go down geometrically with additional baths. Highly unlikely that 4 baths would be occupied at the same time, let alone drawing a large receptacle load.

8roty 07-27-2009 11:10 PM

I've searched around and everytime I read that bath GFIs need to be wired 1 of 2 ways:
1 circuit for bathroom GFI outlet, light, fan from only 1 bathroom
or
1 circuit to connect all bath GFIs but only for GFI outlets.

I haven't come across the maximum number of bathroom GFIs you can connect if I go with the 2nd option. I'm assuming you run the risk of overloading the circuit if 2 people are running hair dryers in 2 of the 4 bathrooms. Or would it take more than that?

Scuba_Dave 07-27-2009 11:22 PM

2 hair dryers would do it
Hair dryer & vacuum
Either of above with any other large load
Main time you will hit overload is when you least want it
When company visiting & all bathrooms in use getting ready to go out
I run a dedicated outlet circuit to every bathroom - I have (3)
Lights & fans are on another circuit
Maybe overkill....but I doubt I will ever have a breaker kick out
My wifes hair dryer is a killer, & the VAC takes 12a
Of course my brother uses a hair dryer a lot too :yes:

stevefastv6 07-27-2009 11:43 PM

gfi circut
 
most codes gfi are per bath room read direct on gfi package! certified electrian should install this so your house does not burn down?:eek:

G17GUY 07-28-2009 12:38 AM

Quote:

Originally Posted by 8roty (Post 307434)
Above the breaker box where the wire comes in for the existing Bath GFI 20 amp breaker/ circuit, can I cut this wire and legally join/ make a new connection and branch to the new run of 12-2 wire to add a new basement bath GFI?

Thanks for your help!


:thumbup: hacker


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