The Electrical Contractor Network

ECN Electrical Forum
Discussion Forums for Electricians, Inspectors and Related Professionals

Books, Tools and Test Equipment for Electrical and Construction Trades

Register Now!

Register Now!

We want your input!

Featured:
   

2017 NEC and Related
2017 NEC
Now Available!

   
Recent Posts
230 or 345 kV transmission lines?
by Vlado
09/24/16 09:33 AM
breaker meltdown
by crselectric
09/24/16 12:42 AM
Electrical mast flashing product
by ThomasWinfrey
09/22/16 12:14 AM
What estimating software do you recommend?
by sparky
09/21/16 07:20 PM
"Dry Run" Inspection goes awry
by HotLine1
09/20/16 07:39 PM
New in the Gallery:
12.5A through 0.75mm˛ flex (just out of curiosity)
Shout Box

Top Posters (30 Days)
HotLine1 15
sparky 9
gfretwell 8
sparky66wv 8
Vlado 6
Who's Online
0 registered (), 272 Guests and 4 Spiders online.
Key: Admin, Global Mod, Mod
Topic Options
Rate This Topic
#168961 - 09/22/07 07:48 AM sharing neutral between 240 and 120
dilydalyer Offline
Member

Registered: 01/08/07
Posts: 59
Loc: tennessee
My boss at work the other day told a guy to rob a neutral from the living room outlet to the 12-2 hr in livingroom for fireplace.The fireplace drawed the same at 4 different voltages but my boss said at 240 this model could do something it couldn't do at 120.............Any thoughts?

Top
Work Gear for Electricians and the Trades

Work Gear for Electricians and the Trades
Work Gear for Electricians and the Trades
Arc Flash Clothing, Gloves, KneePads, Tool Belts, Pouches, Tool Carriers, etc. etc....

#168962 - 09/22/07 08:11 AM Re: sharing neutral between 240 and 120 [Re: dilydalyer]
gfretwell Offline

Member

Registered: 07/20/04
Posts: 9012
Loc: Estero,Fl,usa
300.3(B)?
_________________________
Greg Fretwell

Top
#168971 - 09/22/07 01:24 PM Re: sharing neutral between 240 and 120 [Re: gfretwell]
gibbonsseabee80 Offline
Member

Registered: 10/10/05
Posts: 40
Loc: Chesapeake, VA
I would get more information on what he was trying to accomplish. Robbing or borrowing a neutral alone sounds fishy to me. If someone turns off the power for the fire-place, you are still going to have current present inside the connection box of the fireplace (from the livingroom rececptacles. Sounds like a short-cut or a quick fix based on the information provided.
_________________________
Brian Gibbons

Top
#168978 - 09/22/07 08:46 PM Re: sharing neutral between 240 and 120 [Re: gibbonsseabee80]
leland Offline
Member

Registered: 08/20/07
Posts: 856
Loc: Lowell area, Ma. USA
Find a new employer.
This guy will make you screw up. Then your screwed.

Better still, Tell the Boss "NO".
Your the PRO. you live with your actions, Regardless of direction.

Thats what they will fall back on.

CYA---CYA-----CYA.

Top
#169010 - 09/23/07 01:46 PM Re: sharing neutral between 240 and 120 [Re: leland]
dilydalyer Offline
Member

Registered: 01/08/07
Posts: 59
Loc: tennessee
Yeah,seems to me you have at least two breakers on same phase sharing neutral nomatter what.Does that matter??

Top
#169011 - 09/23/07 02:09 PM Re: sharing neutral between 240 and 120 [Re: dilydalyer]
gibbonsseabee80 Offline
Member

Registered: 10/10/05
Posts: 40
Loc: Chesapeake, VA
If you had two breakers from the same phase, you would not be able to get 240volts. You would get a meter reading of 0 between both hots in the connection box of the fireplace. You will only get 120volts. Now if both breakers are using the same neutral (same phase), you can have excessive current on that neutral. Also, if one of the breakers trips, there will still be voltage present from the other circuit in the connection box. I would not borrow or rig anything. I would homerun a 12/3 cable back to the panel as a dedicated line if it needs a 240volt branch circuit.
_________________________
Brian Gibbons

Top



ECN Electrical Forums - sponsored by Electrical Contractor Network - Electrical and Code Related Discussion for Electrical Contractors, Electricians, Inspectors, Instructors, Engineers and other related Professionals