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-   -   new light/switch off existing circuit (http://www.houserepairtalk.com/f9/new-light-switch-off-existing-circuit-14773/)

gadus 09-21-2012 01:41 AM

new light/switch off existing circuit
 
I want to wire a light for new basement bathroom, with switch. Utilizing existing circuits, is it simply a matter of jumping a wire from the closest junction box, first to a switch and then to the (new) light?

Also, to wire an outlet for the vanity, can I simply find a close outlet and run a wire from it?

Thanks much.

kok328 09-21-2012 06:15 AM

for the light, yes it is pretty straight forward.
for the outlet, you will want to pay attention to current load of the circuit you tap into and be sure to install a GFIC outlet.
Better if you can run a dedicated circuit for the outlet as bathroom outlets tend to be used with hair dryers, curling irons and other high wattage items.

JoeD 09-21-2012 06:48 AM

You didn't post a location. In the USA under NEC a receptacle in a bathroom MUST be on a 20 amp circuit dedicated to the bathroom only. You can not tap off a nearby circuit for the receptacle. Tapping a nearby circuit is fine for the light fixture is fine or it can be added to the 20 amp bathroom circuit.

In Canada you would be fine tapping any circuit for the light and receptacle as long as the count of outlets(lights, receptacles, fans, etc.) does not go over 12. Only 12 outlets are permitted per circuit.

CallMeVilla 09-22-2012 02:19 PM

Practically speaking, what you want to do will "work." However, if you run a new receptacle it MUST have a GFCI on it AND there cannot be another GFCI on the same circuit or you will get a conflict. Make sure the circuit is 20A. Laso make sure the total number of devices on that circuit does not exceed the maximum. Do not tie a bathroom receptacle to your lighting circuit because your blowdryer will dim the lights. :)

Wuzzat? 09-22-2012 02:42 PM

Quote:

Originally Posted by CallMeVilla (Post 77372)
. . .your blowdryer will dim the lights. :)

So will a laser printer on the same circuit. It causes a 5v to 8v drop in your nominal line voltage.

JoeD 09-23-2012 07:09 PM

Quote:

Originally Posted by CallMeVilla (Post 77372)
Practically speaking, what you want to do will "work." However, if you run a new receptacle it MUST have a GFCI on it AND there cannot be another GFCI on the same circuit or you will get a conflict.

Where did you get this idea? It not true.

CallMeVilla 09-23-2012 11:23 PM

Maybe my phrasing was not clear. You MUST have GFCI protection for bathroom receptacles. I have seen GFCI's in-line and at the termination point . . . but two GFCIs on the same circuit run will cause conflicting trips.

Does that make my point better? Hope so.

nealtw 09-24-2012 07:30 AM

I tiled a backspash and all outlets in the kitchen were on the same cercuit and all had a gfi. I asked why as one would do. He had something faulting sometimes and couldn't figure what or why. He said they did not interfer with each other.

gadus 09-24-2012 12:14 PM

Wondering if you guys can help me again...

I home-runned the line for the toilet pump as well as the light in the bathroom. The existing 20 amp breaker (Siemens) was badly corroded so I replaced it but still got some sparking after replacing. The poles (?) are badly pitted and it looks like someone sprayed gray Rustoleum on that area maybe to stave off corrosion. Honestly I looked at the other poles (not all) and there doesn't seem to be anywhere near the corrosion that there is on the upper two poles (powering 4 breakers in total). I sanded both poles with some 220 I found lying around and it seemed to help a bit but ultimately the sparking on the one breaker returned so I secured it. How should I proceed from here, short of replacing the whole panel? Can I replace just the strip? Thanks again...G.

JoeD 09-24-2012 01:44 PM

Are there still empty slots in the panel? Move those breakers to the empty slots if there are and put blanks over the holes. Replace the panel when you can because the bus bars once damaged can not be repaired.
I doubt you could find the bus bars to replace them unless the panel is still made. Then it would probably be cheaper to buy a new panel and pull the bars out for your panel.


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