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nuetral question #43328
10/10/04 09:13 PM
10/10/04 09:13 PM
R
rj  Offline OP
Member
Joined: Jan 2003
Posts: 21
Skidmore, Missouri, USA
This might be a dum question and it mighthave been asked before, but here goes. Why does the nuetral always seem to burn? Me and the guys I work with have all wondered why this happens. Thanks for any information that you can give me.

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Re: nuetral question #43329
10/10/04 09:18 PM
10/10/04 09:18 PM
W
Wirenuttt  Offline
Member
Joined: Nov 2002
Posts: 267
Massachusetts
First thing that comes to mind is unbalanced load. Second, the old edison wiring method on 3-ph systems where they shared 3 hots of a, b & c phase and used one nuetral.

Re: nuetral question #43330
10/10/04 09:44 PM
10/10/04 09:44 PM
F
frenchelectrican  Offline
Member
Joined: Feb 2003
Posts: 939
Wi/ Paris France { France for ...
the same thing with multicircuit single phase also when someone is not too bright with L-N-L set up and when the load get uneven it will actally over heat too and once a while i will see the diy's do put the breaker on wrong leg and end up burn the netural wire pretty bad i did see it happend few places it is no fun to fix it right


merci, marc


Pas de problme,il marche n'est-ce pas?"(No problem, it works doesn't it?)

Re: nuetral question #43331
10/11/04 01:09 AM
10/11/04 01:09 AM
Trumpy  Offline

Member
Joined: Jul 2002
Posts: 8,231
SI,New Zealand
Quote
First thing that comes to mind is unbalanced load.

I'd second that!. [Linked Image]
Neutrals in 3 phase wye systems carry the (usually minimal) out-of-balance current and unless there is a gross imbalance of the loads, shouldn't usually be a problem.
However, one situation where I have seen a Neutral get so hot the PVC insulation melted off it, was where an Electrician used a Neutral that was only half the size that it should have been, in a 3wire 230 system over here. [Linked Image]

[This message has been edited by Trumpy (edited 10-11-2004).]

Re: nuetral question #43332
10/11/04 05:17 AM
10/11/04 05:17 AM
S
SteveMc  Offline
Member
Joined: Feb 2004
Posts: 62
Rock Hill, SC
Computers and other non-linear loads add to neutral overheating. any circuit that will have a lot of electronics need it own neutral. The other problem that I have found is loose connections at the neutral bar due to more than one wire under the screw.

Re: nuetral question #43333
10/11/04 09:49 AM
10/11/04 09:49 AM
R
resqcapt19  Offline
Member
Joined: Nov 2000
Posts: 2,148
IL
Quote
Computers and other non-linear loads add to neutral overheating.

Only on three phase wye systems. The neutral problem with nonlinear loads does not happen on single phase 120/240 volt three wire systems.
Don


Don(resqcapt19)
Re: nuetral question #43334
10/11/04 09:12 PM
10/11/04 09:12 PM
N
Norstarr  Offline
Member
Joined: Sep 2004
Posts: 86
Wi
You will usually find this situation when someone has relocated breakers in a panel and now have both circuits on a three wire circuit on the same leg in the panel. Instead of the neutral carrying the difference between the two circuits now it is additive. If you have two 20 amp breakers the neutral could concievably carry 40 amps, hence the burnt or discolored neutral wire. And as Stevemc stated, it is caused by loose connections at the neutral bar. I make it a habit that whenever I open a customers panel I tighten all connections. Takes a minute and if they are there it leaves an impression.
Ron


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