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Old 07-26-2011, 11:28 AM   #1
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Adding an outside lamp to a circuit???


I had to reframe a bit due to replacing a big section of windows w/ a patio door.

This now leaves me w/ a nice section of wall open on the inside - I'll never get a better shot at putting up an outside lamp next to the door. It would be fantastic to just be able to hook it to the circuit running through the outlet attached to the stud further down.

That's where It gets confusing:

225.7 Lighting Equipment Installed Outdoors.
(A) General. For the supply of lighting equipment installed
outdoors, the branch circuits shall comply with
Article 210 and 225.7(B) through (D).

(B) Common Neutral. The ampacity of th~ neutral conductor
shall not be less than the maximum net coinputed
load current between the neutral and all ungrounded conductors
connected to anyone phase of the circuit.

(C) 277 Volts to Ground. Circuits exceeding 120 volts,
nominal, between conductors and not exceeding 277 volts,
nominal, to ground shall be permitted to supply luminaires
(lighting fixtures) for illumination of outdoor areas of industriai
establishments, office buildings, schools, stores,
and other commercial or public buildings where the luminaires
(fixtures) are not less than 900 mm (3 ft) from windows,
platforms, fire escapes, and the like.

(D) 600 Volts Between Conductors. Circuits exceeding
277 volts, nominal, to ground and not exceeding 600 volts,
nominal, between conductors shall be permitted to supply
the auxiliary∑ equipment of electric-discharge lamps in accordance
with 210.6(D)(1).



OK, so 225.7(B) through (D).xyz seems pretty reasonable right? basically it says "don't overload the circuit"

What I don't understand is Article 210......... does EVERYTHING that starts w/ 210. apply to the circuit? It's going to take me hours to even read that!

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Old 07-26-2011, 11:34 AM   #2
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Adding an outside lamp to a circuit???


If the receptacle does not feed the kitchen, dining room, or bathroom, you can add a light fixture.

I don't have an 2011 code book, but 2008 210 talks about multiwired branch circuits.
Is this what you have?

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Old 07-26-2011, 11:36 AM   #3
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Adding an outside lamp to a circuit???


All of 210 (all those pages of stuff starting with 210.), all of 225.8b, all of 225.7c, all of 225.7d.

If you don't have two hot wires (usually red and black) accompanying a single neutral wire coming into the outlet box down below then the subject of multiwire branch circuit does not apply.
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Last edited by AllanJ; 07-26-2011 at 11:41 AM.
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Old 07-26-2011, 11:47 AM   #4
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Adding an outside lamp to a circuit???


JB: Worse! The only CT specific thing I found was 2003 w/ a 2005 addendum! You'd think they would make these things more accessible.

Allan: There's only one hot wire entering the box, then there's one leaving it, feeding the outlet to it's left.

So .... it sounds like this is OK to do even though the reading seems painful.
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Old 07-26-2011, 03:37 PM   #5
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Adding an outside lamp to a circuit???


A lot of folks will just wire up the light to that outlet box and be done with it.

It is possible that there isn't enough space in the outlet box to add the third cable coming down from the light; you would then have to substitute a bigger box (20 cubic inches). Three cables each with black and white wire ends equals six points. The receptacle is two points. One point for all the ground wires, one point for all the cable clamps or fingers, total ten points. Times 2 cubic inches per point for 14 gauge wires.
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Old 07-26-2011, 03:54 PM   #6
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Adding an outside lamp to a circuit???


I think I'm at the point where I'm just going to wire it up and be done with it haha.

I don't see a problem w/ the box being too small, but I guess now is as good of a time as I'm ever going to get to replace it with a bigger one. Hopefully I'll never open that wall again.

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