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-   -   Replacing duplex receptacle with nighlight - wiring question (http://www.diychatroom.com/f18/replacing-duplex-receptacle-nighlight-wiring-question-70287/)

Rabu 05-01-2010 11:11 AM

Replacing duplex receptacle with nighlight - wiring question
 
Hi all,

I am replacing two duplex receptacles with units that feature a single receptacle and a nightlight. The wiring is different on the new ones and I want to make sure I'm proceeding the right way because I'm scared of death and fire (and monsters).

The current installation has 3 pairs of black/white wires and a bare ground. Two pairs are connected to screws on the sides and the third pair is going directly into the back. Each receptacle is downstream of a GFCI receptacle, but it's not GFCI itself.

The new nightlight receptacle only has connections for one pair (silver screw on one side and black screw on the other) and the ground.

My plan is to wire nut all three black wires with a jumper to the black screw on the receptacle and do the same thing with the white wires to the silver screw and connect the ground to the ground screw. Is this correct? In this setup it doesn't matter which is the lead pair and which are the loads, right?

Thanks for your help. It is much appreciated.

Charlie

brric 05-01-2010 11:29 AM

Your plan is correct.

Rabu 05-01-2010 11:47 AM

Thanks a bunch!

secutanudu 05-01-2010 11:57 AM

THe only thing to take into consideration is box fill. Is the outlet the only thing in the box? If so, you have 2 conductors coming in and 4 going out. That's a total of 6 . All the grounds count as 1, that makes 7. Each device (outlet/switch) counts as 2 conductors. Now we're up to 9. Clamps count as 1 (metal box). Up to 10 now.

For 12 gauge wiring (worst case scenario for box fill) each conductor needs 2.25 cubic inches.
12 x 2.25 = 27 cubic inches - bigger than most single gang boxes.

Best case scenario for a single gang box:
Plastic box (probably no clamps) and 14 gauge wire: 22 cubic inches.

Hopefully I did that all correctly.

Rabu 05-02-2010 03:45 PM

Quote:

Originally Posted by secutanudu (Post 436168)
THe only thing to take into consideration is box fill....

For 12 gauge wiring (worst case scenario for box fill) each conductor needs 2.25 cubic inches.
12 x 2.25 = 27 cubic inches - bigger than most single gang boxes.

Best case scenario for a single gang box:
Plastic box (probably no clamps) and 14 gauge wire: 22 cubic inches

You lost me a bit there, but I'm assuming you're talking about being able to physically get that much stuff in the box. I got it all in there and everything is working, so I think I'm good to go.

If I misunderstood what you meant and need to redo it differently, any clarification would be appreciated. I'm an electrical newbie, if you didn't guess that already.

Thanks,

Charlie

secutanudu 05-02-2010 03:54 PM

THere is a legal limit to box fill, not just how many you can stuff in :)

I have found that usually, if you can fit it in without too much trouble, it's probably legal. But you should do the calculation anyway to be safe. Read this for more info:

http://www.selfhelpandmore.com/home-...tions-2002.php

kbsparky 05-02-2010 07:51 PM

Simply replacing a wiring device will not change the box fill calculations/requirements. :huh:

If it was in compliance before, it will be in compliance after. :whistling2:

If it was overfilled before, then it will still be overfilled.


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