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#36146 - 03/29/04 10:55 PM Resi light circuits  
derater  Offline
Member
Joined: Mar 2002
Posts: 179
Asked this before in the middle of another thread; guess it got lost in the shuffle.
Is it code compliant to feed power to a light
fixture and run wire(s) to the switch to control it? If not, please site code section.
Thanks.


Work Gear for Electricians and the Trades

#36147 - 03/29/04 11:02 PM Re: Resi light circuits  
Ryan_J  Offline
Moderator
Joined: Aug 2003
Posts: 1,374
West Jordan, Utah, USA
Perfectly legal. Make sure you comply with 200.7(C)(2)


Ryan Jackson,
Salt Lake City

#36148 - 03/29/04 11:04 PM Re: Resi light circuits  
hbiss  Offline
Member
Joined: Dec 2003
Posts: 886
Hawthorne, NY USA
Is it code compliant? I'm not going to tell you but rather ask you why you think it wouldn't be. Lets see if we can get you to figure it out for yourself.

-Hal


#36149 - 03/30/04 12:10 AM Re: Resi light circuits  
Hutch  Offline
Member
Joined: May 2002
Posts: 381
South Oxfordshire, UK
Isn't this scenario just a 'loop-in'?

White 'Line' lamp (box) to switch - taped Black.
Black, load to lamp.


#36150 - 03/30/04 05:13 AM Re: Resi light circuits  
pauluk  Offline
Member
Joined: Aug 2001
Posts: 7,520
Norfolk, England
The loop-in method has been pretty much the de facto standard for many years here in Britain.

The only possible drawback is that if someone starts fiddling around with the fixture believing it to be dead because they've turned it off at the wall switch, they could get a nasty surprise. But then if they don't realize there could still be power there, they shouldn't be messing around with it, so I don't see any problem.


#36151 - 03/30/04 10:16 AM Re: Resi light circuits  
Hutch  Offline
Member
Joined: May 2002
Posts: 381
South Oxfordshire, UK
Interesting though Paul the subtle difference between the loop-in colo(u)r coding between the US and UK. When using normal ‘Romex’ style cable for the switch loop in the UK the hot coloured wire is used as the ‘line’ and the neutral wire (taped hot) is used as the switched return ‘load’. Exactly the opposite coding is used in the US – does anyone know why this is?

I understand that for commercial work in the UK, one can obtain twin plus ground cable with two hot coloured wires specially for loop-ins.


#36152 - 03/30/04 10:18 AM Re: Resi light circuits  
Ryan_J  Offline
Moderator
Joined: Aug 2003
Posts: 1,374
West Jordan, Utah, USA
Hi Hutch. I think the reason that you are required to use the white as the pwer to the switch an d not from the switch is so you don't end up with two white wires connected to your light, one grounded (white) and one ungrounded(white).

By following 200.7(C)(2) you would have one grounded (white) and one ungrounded (black).


Ryan Jackson,
Salt Lake City

#36153 - 03/30/04 12:43 PM Re: Resi light circuits  
CalSparky  Offline
Member
Joined: Mar 2004
Posts: 32
Northern California
For what its worth, in my opinion in the case of 2 wire romex it is much more obvious to use the white wire as the line that is grouped with the hots and run to the switch and the black wire as the line from the switch to the fixture. As was pointed out in the last post the wiring at the fixture has the normal "black and white" wires run to it. More importantly, the white wire grouped with the hots gives the fact away that the white wire is being used as part of a switch leg and the black wire joined with it in the romex should be attached to the fixture -- makes doing any trouble shoot work a snap.


#36154 - 03/30/04 06:14 PM Re: Resi light circuits  
derater  Offline
Member
Joined: Mar 2002
Posts: 179
Thanks all, for the feedback.I asked because every EC I've worked for said to feed the power to the switch.I like it that way, also
as sited by Pauluk,homeowner thinks w/ switch off the fixture is safe,but...


#36155 - 03/30/04 06:27 PM Re: Resi light circuits  
iwire  Offline
Moderator
Joined: Jan 2003
Posts: 4,391
North Attleboro, MA USA
I don't have to mark the white used to feed a switch black. [Linked Image] [Linked Image]

Bob


Bob Badger
Construction & Maintenance Electrician
Massachusetts

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