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#56121 - 09/15/05 06:52 PM Neutral Current Carrrying?
bot540 Offline
Member

Registered: 09/14/04
Posts: 177
Loc: Vernon Hills, IL
I know this has probally been asked a thousand times but does the neutral in a 2 wire single phase circuit(ie: a small apliance branch circuit) count as a current carrying conductor?
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#56122 - 09/15/05 06:59 PM Re: Neutral Current Carrrying?
iwire Offline
Moderator

Registered: 01/05/03
Posts: 4343
Loc: North Attleboro, MA USA
You don't have a neutral in a two wire circuit.

You have a ungrounded conductor, a grounded conductor and maybe a grounding conductor.

Both the ungrounded conductor and grounded conductor are current carrying conductors.

Bob
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#56123 - 09/15/05 07:02 PM Re: Neutral Current Carrrying?
Roger Offline
Member

Registered: 05/18/02
Posts: 1779
Loc: N.C.
Absolutely, in a 2 wire circuit it is impossible to have a neutral conductor. Click Here

Roger

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#56124 - 09/15/05 07:05 PM Re: Neutral Current Carrrying?
Roger Offline
Member

Registered: 05/18/02
Posts: 1779
Loc: N.C.
I was a little slow on that one Bob.

Roger

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#56125 - 09/15/05 07:13 PM Re: Neutral Current Carrrying?
bot540 Offline
Member

Registered: 09/14/04
Posts: 177
Loc: Vernon Hills, IL
Thanks guys I just read the post in the nec forum and understand.
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Jesus may have been a capenter,but God was an electrician.Genesis1:3

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#56126 - 09/15/05 07:13 PM Re: Neutral Current Carrrying?
Attic Rat Offline
Member

Registered: 12/14/03
Posts: 530
Loc: Bergen Co.,N.J. USA
...Bob,I may be wrong here,but,isn't the grounded conductor considered current-carrying ONLY when used in circuits where there are non-linear loads harmonics,such as HID lighting,servo controls,ballasts,or in a 3 phase wye utilizing only 2 phases and a neutral...etc??otherwise,if the circuit is balanced,the current on the neutral is 0,you wouldn't count it as current -carrying for derating purposes,ampacity..??
Russ
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#56127 - 09/15/05 07:19 PM Re: Neutral Current Carrrying?
winnie Offline
Member

Registered: 09/15/03
Posts: 652
Loc: boston, ma
Attic Rat, the OP was asking about a two wire circuit, not a multiwire circuit where current could balance in the neutral.

-Jon

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#56128 - 09/15/05 07:21 PM Re: Neutral Current Carrrying?
Attic Rat Offline
Member

Registered: 12/14/03
Posts: 530
Loc: Bergen Co.,N.J. USA
Ooops,..my bad...
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.."if it ain't fixed,don't break it...call a Licensed Electrician"

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#56129 - 09/15/05 07:37 PM Re: Neutral Current Carrrying?
bot540 Offline
Member

Registered: 09/14/04
Posts: 177
Loc: Vernon Hills, IL
Does a grounded conductor have to be perfectly balanced in order not to be counted as a current carrying conductor? Can someone give a feild example?
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#56130 - 09/15/05 07:42 PM Re: Neutral Current Carrrying?
Attic Rat Offline
Member

Registered: 12/14/03
Posts: 530
Loc: Bergen Co.,N.J. USA
... Take a normal 3 phase wye circuit,..all sharing the neutral,and the loads close to being equal...(barring the use of HID fixtures,processors,variable speed drives etc)and you should have a balanced circuit..
Russ
_________________________
.."if it ain't fixed,don't break it...call a Licensed Electrician"

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