240v Dryer
- Thread starter chjhnsn
- Start date
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bphgravity
Senior Member
- Location
- Florida
Re: 240v Dryer
Yes, that is correct. Remove the bonding jumper between the neutral connection and the frame and connect the ground to the frame and the neutral will stay isolated.
Yes, that is correct. Remove the bonding jumper between the neutral connection and the frame and connect the ground to the frame and the neutral will stay isolated.
sparky_magoo
Senior Member
- Location
- Reno
Re: 240v Dryer
Since the 1996 code cycle, that is your only option.
My house came with a three wire receptacle (only four years old). I found the 10 AWG NMB cable had a bond wire. I installed a four wire recetacle and upgraded the dryer cord.
At my old apartment, I bonded the dryer chassis to a cold water pipe in my old laundry room. I measured from two to eight amps flowing on the bond wire with the jumper in place, so I disconnected the bond wire.
Since the 1996 code cycle, that is your only option.
My house came with a three wire receptacle (only four years old). I found the 10 AWG NMB cable had a bond wire. I installed a four wire recetacle and upgraded the dryer cord.
At my old apartment, I bonded the dryer chassis to a cold water pipe in my old laundry room. I measured from two to eight amps flowing on the bond wire with the jumper in place, so I disconnected the bond wire.
- Location
- Windsor, CO NEC: 2017
- Occupation
- Service Manager
Re: 240v Dryer
That's what they call "objectionable current."
That's what they call "objectionable current."
jimwalker
Senior Member
- Location
- TAMPA FLORIDA
Re: 240v Dryer
Residential changed in 96 but mobiles been 4 wire for far far longer
Residential changed in 96 but mobiles been 4 wire for far far longer
B
bthielen
Guest
Re: 240v Dryer
I was always currious why mobile homes were treated differently with regard to this topic. How was a residential application considered safe enough not to require 4-wire circuits while mobile homes did require them?
Bob
I was always currious why mobile homes were treated differently with regard to this topic. How was a residential application considered safe enough not to require 4-wire circuits while mobile homes did require them?
Bob
LarryFine
Master Electrician Electric Contractor Richmond VA
- Location
- Henrico County, VA
- Occupation
- Electrical Contractor
Re: 240v Dryer
[ October 24, 2005, 01:01 PM: Message edited by: LarryFine ]
Probably because of the steel frame and no or poor earth connection since the chassis is isolated from the earth. By definition, a mobile home's service is a sub-panel.
[ October 24, 2005, 01:01 PM: Message edited by: LarryFine ]
stud696981
Senior Member
Re: 240v Dryer
Larry is correct. The three wire stove and dryer outlets were only allowed when run from service equipment, not a sub-panel. In a mobile home, the service is on a pedistal and the panel inside is a sub-panel, so that is why they were always 4 wire outlets.
Larry is correct. The three wire stove and dryer outlets were only allowed when run from service equipment, not a sub-panel. In a mobile home, the service is on a pedistal and the panel inside is a sub-panel, so that is why they were always 4 wire outlets.
Re: 240v Dryer
I too was under the impression that a three-wire range or dryer connection had to be run from the service panel and not from a sub-panel and that was the reasoning behind the four-wire requirement in mobile homes. I pulled out my 1993 code book and re-read that section. It only says that an uninsulated neutral required that the circuit originate in the service panel. It looks like an insulated neutral could be run from a sub-panel and used to ground these appliances. Am I missing something? I thought I understood, but now I am not sure.
I too was under the impression that a three-wire range or dryer connection had to be run from the service panel and not from a sub-panel and that was the reasoning behind the four-wire requirement in mobile homes. I pulled out my 1993 code book and re-read that section. It only says that an uninsulated neutral required that the circuit originate in the service panel. It looks like an insulated neutral could be run from a sub-panel and used to ground these appliances. Am I missing something? I thought I understood, but now I am not sure.
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