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#56121 - 09/15/05 09:52 PM Neutral Current Carrrying?  
bot540  Offline
Member
Joined: Sep 2004
Posts: 174
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?


Jesus may have been a capenter,but God was an electrician.Genesis1:3

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#56122 - 09/15/05 09:59 PM Re: Neutral Current Carrrying?  
iwire  Offline
Moderator
Joined: Jan 2003
Posts: 4,391
North Attleboro, MA USA
You don't have a neutral in a two wire circuit. [Linked Image]

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


Bob Badger
Construction & Maintenance Electrician
Massachusetts

#56123 - 09/15/05 10:02 PM Re: Neutral Current Carrrying?  
Roger  Offline
Member
Joined: May 2002
Posts: 1,716
N.C.
Absolutely, in a 2 wire circuit it is impossible to have a neutral conductor. Click Here

Roger


#56124 - 09/15/05 10:05 PM Re: Neutral Current Carrrying?  
Roger  Offline
Member
Joined: May 2002
Posts: 1,716
N.C.
I was a little slow on that one Bob. [Linked Image]

Roger


#56125 - 09/15/05 10:13 PM Re: Neutral Current Carrrying?  
bot540  Offline
Member
Joined: Sep 2004
Posts: 174
Vernon Hills, IL
Thanks guys I just read the post in the nec forum and understand.


Jesus may have been a capenter,but God was an electrician.Genesis1:3

#56126 - 09/15/05 10:13 PM Re: Neutral Current Carrrying?  
Attic Rat  Offline
Member
Joined: Dec 2003
Posts: 524
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


.."if it ain't fixed,don't break it...call a Licensed Electrician"

#56127 - 09/15/05 10:19 PM Re: Neutral Current Carrrying?  
winnie  Offline
Member
Joined: Sep 2003
Posts: 649
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


#56128 - 09/15/05 10:21 PM Re: Neutral Current Carrrying?  
Attic Rat  Offline
Member
Joined: Dec 2003
Posts: 524
Bergen Co.,N.J. USA
Ooops,..my bad... [Linked Image] [Linked Image]


.."if it ain't fixed,don't break it...call a Licensed Electrician"

#56129 - 09/15/05 10:37 PM Re: Neutral Current Carrrying?  
bot540  Offline
Member
Joined: Sep 2004
Posts: 174
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?


Jesus may have been a capenter,but God was an electrician.Genesis1:3

#56130 - 09/15/05 10:42 PM Re: Neutral Current Carrrying?  
Attic Rat  Offline
Member
Joined: Dec 2003
Posts: 524
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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