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MH Neutral/Ground Bonding #54351
07/26/05 08:54 PM
07/26/05 08:54 PM
Theelectrikid  Offline OP
Member
Joined: Apr 2004
Posts: 810
Levittown, PA
Quick question here guys. In a mobile home with a four wire feed from the pedestal, with the ground and neutral bonded at the pedestal, should the two be bonded in the service panel? I'm asking for my dad who can't use a 'puter.He asked an "electrician" (note the quotation marks), and he said that it's there in normal homes, and it should be in this house. This ain't a normal house.
Thank you,
Ian A.


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Re: MH Neutral/Ground Bonding #54352
07/26/05 09:00 PM
07/26/05 09:00 PM
Theelectrikid  Offline OP
Member
Joined: Apr 2004
Posts: 810
Levittown, PA
Also, are there any dangers of having the two bonded twice?

(Please excuse the stpid questions, I want more opinions.)
Ian A.


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Re: MH Neutral/Ground Bonding #54353
07/27/05 12:20 AM
07/27/05 12:20 AM
renosteinke  Offline
Cat Servant
Member
Joined: Jan 2005
Posts: 5,316
Blue Collar Country
The "danger" in having the neutral and the ground connected to each other in more than one place is in that this set up a "parallel path." That is, part of the ground wire will always be carrying current- which it is not intended to do.
In a mobile home, connected by a cable, the risk is a lot less than, say, in a situation where a section of conduit becomes a "neutral;" but it is still aviolation.

Connect ("bond") the two once- preferably at the point where the utility neutral goes one way, and the wire to the ground rod goes the other.

As to things "always being done...." well, trailer/RV parks are famous for incorrect wiring methods.

Re: MH Neutral/Ground Bonding #54354
07/27/05 01:52 AM
07/27/05 01:52 AM
R
Ray97502  Offline
Member
Joined: Oct 2004
Posts: 55
Central Point,OR
If the neutral is bonded at a second location away from where the grounding electrode conductor and the main bonding jumper connect, then there needs to be another ground rod driven and another equipment grounding conductor applied to the bonding jumper at the second location, just as if you were feeding a sub panel with the grounded conductor and the grounding conductor are run with the feeder. In the 2002 code book look at 250.32 for clarification. Although the pedestal does not constitute a separate building the intent is that for each point where the grounded conductor and the grounding conductor are bonded there is a separate connection to earth. What might be acceptable is to connect a separate grounding electrode conductor from the panel in mobile to the existing ground rod.

Re: MH Neutral/Ground Bonding #54355
07/27/05 05:39 AM
07/27/05 05:39 AM
Joe Tedesco  Offline
Member
Joined: Oct 2000
Posts: 2,749
Boston, Massachusetts USA
See 550.16(A)(1) on page 451 in the 2005 NEC for the correct answer to the question.


Joe Tedesco, NEC Consultant
Re: MH Neutral/Ground Bonding #54356
07/27/05 03:18 PM
07/27/05 03:18 PM
A
Alan Nadon  Offline
Member
Joined: Mar 2005
Posts: 399
Elkhart, IN. USA
Look at the outside of the home where the electrical connection goes under the home. Look for the sticker that may still be there. It will read something like 120 / 240 volt FOUR wire.
Follow the instructions.
If they were meant to be reconnected at the home it would only need three wires.
One "danger" of reconnecting is that the frame of the home is bonded to the grounding conductor. Connecting the green to the white wire in the home means you could energize the frame of the home.
Alan --


Alan--
If it was easy, anyone could do it.
Re: MH Neutral/Ground Bonding #54357
07/27/05 05:22 PM
07/27/05 05:22 PM
Theelectrikid  Offline OP
Member
Joined: Apr 2004
Posts: 810
Levittown, PA
Sorry, but this place is so old (1973) the stickers are long gone! I know the home is four wire, since the electrician who serviced another home of the same model said he found a sticker that said:

120/240VAC
100Ampere
60Hz

"Connecting the green to the white wire in the home means you could energize the frame of the home." And the aluminum siding.

Ian A.

[This message has been edited by Theelectrikid (edited 07-27-2005).]


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