Correct Wiring For An Electric Dryer In An Old Home - Electrical - Contractor Talk

Correct Wiring For An Electric Dryer In An Old Home

 
Thread Tools Search this Thread Display Modes
Old 11-29-2011, 04:35 AM   #1
Pro
 
rstarre's Avatar
 
Trade: General Contractor
Join Date: Dec 2008
Posts: 103
Rewards Points: 93

Correct Wiring For An Electric Dryer In An Old Home


I am remodeling an old home. The electric panel was upgraded by the home owner to 200 amp service back in 1991. The electrician ran an electric outlet in the laundry room for an electric dryer, just in case the home owner ever want to switch from her gas dryer to an electric clothes dryer. Well now she wants to make the change. My question is the wiring. I know it should be a 30amp double circuit breaker, wired for 220 & a no. 10-3 wire with a bare ground. The thing I am not sure about is the electrician used 10-2 wire with a bare ground. I know the electric code for heavy appliances was changed in 1993. So was the 10-2 wire the correct code prior to 1993? The way it is wired now is the black & white are connected to the double 30 amp circuit breaker in the panel. The white wire has black tape & tag noting it is being used as hot instead of neutral. The bare copper wire is being used as the white, and is connected to the side bar in the panel where the other white wires are connected. Was this the correct way to do it or was this code before 1993? I do not want to plug the new dryer in unless I am sure this is ok. I can also ground the dyer by running a ground wire from somewhere on the exterior back of the dryer to a water pipe for the wash machine.
rstarre is offline  

Warning: The topics covered on this site include activities in which there exists the potential for serious injury or death. ContractorTalk.com DOES NOT guarantee the accuracy or completeness of any information contained on this site. Always use proper safety precaution and reference reliable outside sources before attempting any construction or remodeling task!

   

Advertisement

 

Old 11-29-2011, 06:59 AM   #2
I own stock in FotoMat!
 
480sparky's Avatar
 
Trade: 132 on Bush, I've got him at gunpoint!
Join Date: Jan 2009
Location: Iowa
Posts: 11,630
Rewards Points: 10,780

Re: Correct Wiring For An Electric Dryer In An Old Home


Hooking 10-2 up to a dryer today would be a violation.

Advertisement

__________________
Why is there not a Flat Mars Society?.
480sparky is online now  
Old 11-29-2011, 08:20 AM   #3
Pro
 
rstarre's Avatar
 
Trade: General Contractor
Join Date: Dec 2008
Posts: 103
Rewards Points: 93

Re: Correct Wiring For An Electric Dryer In An Old Home


Well it is up to the home owner if she wants to plug that electric dryer in. I haven't moved the dryer outlet box or disconnected any wiring from it.
I noticed it when I took the front panel off the box to paint. According to the home owner, it was done prior to the change in code. Was that the proper way to wire it back then?
rstarre is offline  
   
 
Old 11-29-2011, 10:04 AM   #4
Contractor of the Month
 
Inner10's Avatar
 
Trade: Control Systems
Join Date: Mar 2009
Location: Ottawa, ON
Posts: 24,128
Rewards Points: 13,420

Re: Correct Wiring For An Electric Dryer In An Old Home


The code allowed you to use the bare conductor as the neutral?

And no grounding conductor?
__________________
The Following User Says Thank You to Inner10 For This Useful Post: Leo G
Inner10 is offline  
Old 11-29-2011, 10:32 AM   #5
Pro
 
Kgmz's Avatar
 
Trade: General, Electrical, and Plumbing Contractor
Join Date: Feb 2007
Location: Portland, OR & Eatonville, WA
Posts: 1,300
Rewards Points: 500

Re: Correct Wiring For An Electric Dryer In An Old Home


Quote:
Originally Posted by Inner10 View Post
The code allowed you to use the bare conductor as the neutral?

And no grounding conductor?
Yes and No. At one time a 3 wire dryer outlet was allowed and 4 wire outlets were only required for mobile homes. I believe this changed with the 1996 NEC.

As for using the ground as a neutral, back then a lot of dryers were 240 volt everything heater, motor, etc. so no neutral was needed. Some would have 120 volt timers but that was allowed, if I remember right as the NEC stated something as long as the are no objectionable loads on the ground. Eventually manufacturers started going to 120 volt motors to save money and thats when the code was finally changed to address this.
Kgmz is offline  
The Following User Says Thank You to Kgmz For This Useful Post:
Inner10 (11-29-2011)
Old 11-29-2011, 11:01 AM   #6
Pro
 
rstarre's Avatar
 
Trade: General Contractor
Join Date: Dec 2008
Posts: 103
Rewards Points: 93

Re: Correct Wiring For An Electric Dryer In An Old Home


Quote:
Originally Posted by Kgmz View Post
Yes and No. At one time a 3 wire dryer outlet was allowed and 4 wire outlets were only required for mobile homes. I believe this changed with the 1996 NEC.

As for using the ground as a neutral, back then a lot of dryers were 240 volt everything heater, motor, etc. so no neutral was needed. Some would have 120 volt timers but that was allowed, if I remember right as the NEC stated something as long as the are no objectionable loads on the ground. Eventually manufacturers started going to 120 volt motors to save money and thats when the code was finally changed to address this.
So if she has a newer dryer, it will work properly on the the way it is wired now?
rstarre is offline  
Old 11-29-2011, 11:04 AM   #7
Contractor of the Month
 
Inner10's Avatar
 
Trade: Control Systems
Join Date: Mar 2009
Location: Ottawa, ON
Posts: 24,128
Rewards Points: 13,420

Re: Correct Wiring For An Electric Dryer In An Old Home


In theory it will work fine but it won't be grounded too well.
__________________
The Following User Says Thank You to Inner10 For This Useful Post: Leo G
Inner10 is offline  
Old 11-29-2011, 04:01 PM   #8
Pro
 
rstarre's Avatar
 
Trade: General Contractor
Join Date: Dec 2008
Posts: 103
Rewards Points: 93

Re: Correct Wiring For An Electric Dryer In An Old Home


Thanks
rstarre is offline  
Old 11-29-2011, 04:33 PM   #9
Pro
 
Kgmz's Avatar
 
Trade: General, Electrical, and Plumbing Contractor
Join Date: Feb 2007
Location: Portland, OR & Eatonville, WA
Posts: 1,300
Rewards Points: 500

Re: Correct Wiring For An Electric Dryer In An Old Home


Quote:
Originally Posted by rstarre View Post
So if she has a newer dryer, it will work properly on the the way it is wired now?
This why dryers do not come with cords. And most appliance stores that come to deliver and install them usually bring both a 3 and 4 wire cord.
Kgmz is offline  
Old 11-29-2011, 04:45 PM   #10
I own stock in FotoMat!
 
480sparky's Avatar
 
Trade: 132 on Bush, I've got him at gunpoint!
Join Date: Jan 2009
Location: Iowa
Posts: 11,630
Rewards Points: 10,780

Re: Correct Wiring For An Electric Dryer In An Old Home


Quote:
Originally Posted by Inner10 View Post
In theory it will work fine but it won't be grounded too well.
It will be grounded, but it's not as safe as a 4-wire feed.
__________________
Why is there not a Flat Mars Society?.
480sparky is online now  
The Following User Says Thank You to 480sparky For This Useful Post:
skyhook (11-29-2011)
Old 11-29-2011, 09:48 PM   #11
Member
 
SemiRetiredEL's Avatar
 
Trade: Electrial Contractor (master)
Join Date: Nov 2009
Posts: 77
Rewards Points: 75

Re: Correct Wiring For An Electric Dryer In An Old Home


The groundwire may need to be jumpered to the neutral so the 120V timer etc. will run.
SemiRetiredEL is offline  
Old 11-30-2011, 04:03 AM   #12
Pro
 
txgencon's Avatar
 
Trade: General & Electrical Contracting
Join Date: Jan 2011
Location: Dallas, Texas
Posts: 2,479
Rewards Points: 430

Re: Correct Wiring For An Electric Dryer In An Old Home


I wonder how many times the other sparkies get a call from a new homeowner wanting the receptacle changed to a three prong receptacle to accomodate their old dryer. Seems like it happens about half the time with me. Most homeowners can't grasp the concept and think I installed the wrong receptacle.
txgencon is offline  
Old 11-30-2011, 05:54 AM   #13
Pro
 
mrmike's Avatar
 
Trade: Electrical & Carpentry
Join Date: Dec 2008
Location: Adirondacks of NY
Posts: 838
Rewards Points: 500

Re: Correct Wiring For An Electric Dryer In An Old Home


Don't even think twice about it- Tell your Customer that the Wire needs to be changed out to be SAFE !!!
Usually, if it is on the first floor & it is beeing remodeled- it should be a piece of cake !!

Advertisement

mrmike is offline  


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes Rate This Thread
Rate This Thread:

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
Home Builders -how to talk to the correct person for my services? RacerX780 Marketing & Sales 4 04-11-2010 02:12 AM
USDA Home Loans - Rehab Funds renet General Discussion 0 10-02-2009 11:00 PM
Question On Home Automation System degmsb General Discussion 3 09-21-2009 01:26 PM
Log Home Advise Lew Construction 1 08-12-2009 07:54 PM

Join Now... It's Fast and FREE!

I am a professional contractor
I am a DIY Homeowner
Drywall Talk is for
PROFESSIONAL CONTRACTORS ONLY!

At DrywallTalk.com we cater exlusivly to professional contractors who make their living as a contractor. Knowing that many homeowners and DIYers are looking for a community to call home, we've created www.DIYChatroom.com DIY Chatroom is full of helpful advices and perfect for DIY homeowners.

Redirecing in 10 seconds
No Thanks
terms of service

Already Have an Account?