3-way Switch Wiring - Electrical - DIY Chatroom Home Improvement Forum


Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > Electrical

CLICK HERE AND JOIN OUR COMMUNITY TODAY...IT'S FREE!

Reply
 
Thread Tools Display Modes
Old 02-05-2011, 02:17 PM   #1
Member
 
Join Date: Feb 2011
Location: Manitoba, Canada
Posts: 127
Rewards Points: 75
Default

3-way switch wiring


3-way switch wiring-3-way-power-light.jpg

Name:  3-way - power to switch.jpg
Views: 1696
Size:  24.8 KB

3-way switch wiring-3-way-power-swtich2.jpg

3-way switch wiring-3-way-power-light2.jpgI'm new to the site, and a certified electrician. I've been browsing the site and notice alot of people having trouble with 3-way switches. Here are some diagrams for quick reference. Maybe a sticky?

Advertisement


Last edited by CheapCharlie; 02-05-2011 at 02:21 PM.
CheapCharlie is offline   Reply With Quote
Old 02-05-2011, 02:22 PM   #2
Licensed electrician
 
Join Date: Sep 2007
Location: Maryland
Posts: 7,999
Rewards Points: 2,796
Default

3-way switch wiring


Before they get made into a sticky you might want to look at NEC 200.7. The re-identified white needs to the the feed to the switch.

Advertisement

__________________
Answers based on the National Electrical Code. Local amendments may apply. Check with your local building officials.
Jim Port is offline   Reply With Quote
Old 02-05-2011, 02:23 PM   #3
Member
 
Join Date: Feb 2011
Location: Manitoba, Canada
Posts: 127
Rewards Points: 75
Default

3-way switch wiring


Quote:
Originally Posted by Jim Port View Post
Before they get made into a sticky you might want to look at NEC 200.7. The re-identified white needs to the the feed to the switch.
I'm from Canada. Must be different here
CheapCharlie is offline   Reply With Quote
Old 02-05-2011, 03:06 PM   #4
Electrical Supplier
 
Join Date: Jun 2010
Location: Dayton, OH
Posts: 205
Rewards Points: 150
Default

3-way switch wiring


The New NEC requires a Neutral to be carried throughout the circuit on residential. I think they started this in 2008, I know it is in 2010....

Youll have to use 14/3 or 12/3 romex w/ground for between the switches and anywhere else where you need to.

no reidentifying anymore.....Red and Black are your travelers between the switches.
__________________
"Do it right the first time and avoid duplication of effort"

Your AHJ/Inspectors ALWAYS have the final say on ANY electrical code issue.
If in doubt, contact a licensed, experienced, reputable electrician to perform the work.
LyonsElecSupply is offline   Reply With Quote
Old 02-05-2011, 03:48 PM   #5
Member
 
joed's Avatar
 
Join Date: Mar 2005
Location: Welland, Ontario
Posts: 8,349
Rewards Points: 3,492
Blog Entries: 4
Default

3-way switch wiring


Nope the white needs to FEED the switch in Canada as well.
__________________
Do not PM with questions that can be asked in a forum. I will not respond.
joed is offline   Reply With Quote
Old 02-05-2011, 04:47 PM   #6
Member
 
Join Date: Jan 2011
Posts: 104
Rewards Points: 77
Default

3-way switch wiring


This is the drawing that I give to new guys wiring up three way switches,
Attached Images
 
davido30093 is offline   Reply With Quote
Old 02-05-2011, 06:07 PM   #7
Member
 
Join Date: Feb 2011
Location: Manitoba, Canada
Posts: 127
Rewards Points: 75
Default

3-way switch wiring


Quote:
Originally Posted by davido30093 View Post
This is the drawing that I give to new guys wiring up three way switches,
My bad, misunderstood what was being said earlier....BACK IN BLACK!
CheapCharlie is offline   Reply With Quote
Old 02-05-2011, 07:35 PM   #8
Member
 
Join Date: Feb 2010
Location: Oklahoma
Posts: 979
Rewards Points: 502
Default

3-way switch wiring


According to my understanding, only the bottom image is non-compliant to the 2011 NEC. Correct?

Last edited by jlmran; 02-05-2011 at 08:10 PM. Reason: re-evaluation
jlmran is offline   Reply With Quote
Old 02-05-2011, 09:05 PM   #9
Member
 
Join Date: Mar 2009
Posts: 780
Rewards Points: 500
Default

3-way switch wiring


As I read it all are now none compliant with NEC 2011 which requires neutral to switch boxes. Or am I mistaken?
hayewe farm is offline   Reply With Quote
Old 02-05-2011, 09:09 PM   #10
Member
 
Join Date: Feb 2010
Location: Oklahoma
Posts: 979
Rewards Points: 502
Default

3-way switch wiring


Quote:
Originally Posted by hayewe farm View Post
As I read it all are now none compliant with NEC 2011 which requires neutral to switch boxes. Or am I mistaken?
I'm referencing 200.7(C). White conductors can be ungrounded in certain situations. Is there a citation which prohibits switch loops?

Also, what good is a neutral at a 3-way switch? It could work at the switch which receives the circuit feed, but it would serve no purpose to have a neutral at the other switch. Unless I'm blinded by ignorance.
jlmran is offline   Reply With Quote
Old 02-05-2011, 09:17 PM   #11
Member
 
Join Date: Mar 2009
Posts: 780
Rewards Points: 500
Default

3-way switch wiring


I believe the purpose to to have a neutral available for future upgrades to motion sensor or digital switches. I'm refering to NEC 2011 404.2(c)


404.2 Switch Connections.
(C) Switches Controlling Lighting. Switches controlling line-to-neutral lighting loads must have a neutral provided at the switch location.
hayewe farm is offline   Reply With Quote
Old 02-05-2011, 10:29 PM   #12
Member
 
Join Date: Feb 2010
Location: Oklahoma
Posts: 979
Rewards Points: 502
Default

3-way switch wiring


So, not including the exceptions provided, the only way to correctly (NEC 2011) wire a light circuit with 3-way switches is:

1. Power => switch => switch => light (Like davido30093 said above);

or

2. Use 4-wire cable in other configurations. Do these exist as a NM-type cable?

Is this correct?

Last edited by jlmran; 02-05-2011 at 11:42 PM.
jlmran is offline   Reply With Quote
Old 02-05-2011, 11:50 PM   #13
Member
 
Join Date: Mar 2009
Posts: 780
Rewards Points: 500
Default

3-way switch wiring


By the way all the drawings including #3 are NEC 2008 compliant. The re-designated white wires in drawing three are not used as a return which is the only restriction for their use as a re-designated wire.
hayewe farm is offline   Reply With Quote
Old 02-06-2011, 12:21 AM   #14
Member
 
Join Date: Mar 2009
Posts: 780
Rewards Points: 500
Default

3-way switch wiring


Quote:
Originally Posted by jlmran View Post
So, not including the exceptions provided, the only way to correctly (NEC 2011) wire a light circuit with 3-way switches is:

1. Power => switch => switch => light (Like davido30093 said above);

or

2. Use 4-wire cable in other configurations. Do these exist as a NM-type cable?

Is this correct?
Yes. or you could run 2 14-2 cables with one a redesignated white.
Beldon NM 4 cond comes in both -2/2 (example 14 2/2) an -4 (example 12 4) configurations. -2/2 is 2 pair of whit/black and the -4 is white black red blue.

Last edited by hayewe farm; 02-06-2011 at 12:25 AM.
hayewe farm is offline   Reply With Quote
Old 02-06-2011, 09:24 AM   #15
Member
 
Join Date: Feb 2010
Location: Oklahoma
Posts: 979
Rewards Points: 502
Default

3-way switch wiring


Quote:
Originally Posted by hayewe farm
By the way all the drawings including #3 are NEC 2008 compliant. The re-designated white wires in drawing three are not used as a return which is the only restriction for their use as a re-designated wire.
Last OP drawing: Why isn't the RD white wire in the right-side cable a return? Sure, it is feeding a 2nd switch 1st, but it still is returning the current to it's source after a switch.

Advertisement

jlmran is offline   Reply With Quote
Reply


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Wiring an Intermatic Wall Timer in a three way switch aitutaki98 Electrical 6 07-23-2011 12:43 PM
Unusual three way switch wiring help r1racer Electrical 9 11-11-2010 09:49 PM
Switch on K&T wiring - OK to pigtail? fdmillion Electrical 4 01-27-2010 10:15 AM
Wiring two floodlights to a triple switch chrisjardine12 Electrical 20 01-23-2009 01:29 PM
Ceiling Fixture / Switch Wiring gregger Electrical 1 10-21-2006 08:47 PM




Top of Page | View New Posts