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#14759 - 10/01/02 07:16 AM Doing my best to show my ignorance
Trainwire Offline
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Registered: 03/15/02
Posts: 360
Loc: Strasburg,PA,USA
Ok, dumb question dujour.Being a country boy and not a Philadelphia lawyer, and having a somewhat of a hard time reading the code. In figureing allowable ampacities, 310-16, Would the ground conductor be considered a current carrier? or since it's not supposed to carry current, it doesn't figure into the equation.
OK big roundel on my backside, feel free to take a shot.
Trainwire
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#14760 - 10/01/02 07:39 AM Re: Doing my best to show my ignorance
resqcapt19 Offline
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Registered: 11/10/00
Posts: 2148
Loc: IL
Train,
You need to be more specific about what conductor that you are referring to. Are you talking about the equipment grounding conductor or the grounded conductor? If it is the EGC, that is never counted for derating purposes. Derating if required only because of the heat that is produced in the current carrying wires. If you are talking about the grounded conductor, then the answer is, sometimes. If the grounded conductor is part of a multiwire circuit and there is not a lot of non-linear loads on the circuit, then it is not counted. If it is not part of a multiwire circuit, it is always counted. It is also counted when part of a multiwire circuit where the majority of the loads are non-linear. If you have a three phase system and are using only 2 phases and a grounded conductor, it is counted.
Don
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#14761 - 10/01/02 08:43 AM Re: Doing my best to show my ignorance
Trainwire Offline
Member
Registered: 03/15/02
Posts: 360
Loc: Strasburg,PA,USA
In this case it is the conductor to tie the case of a transformer to the case of the panel feeding it.
Trainwire
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#14762 - 10/01/02 10:05 AM Re: Doing my best to show my ignorance
sparky66wv Offline
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Registered: 11/17/00
Posts: 2232
Loc: West Virginia
Sounds like that's an Equipment Grounding Conductor and is therefore exempt from the derating factors.
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#14763 - 10/01/02 11:01 AM Re: Doing my best to show my ignorance
Trainwire Offline
Member
Registered: 03/15/02
Posts: 360
Loc: Strasburg,PA,USA
Thanks that's what I thought, but have you ever started thinking about something, and suddenly start doubting yourself?

Trainwire
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#14764 - 10/01/02 01:13 PM Re: Doing my best to show my ignorance
pauluk Offline
Member
Registered: 08/11/01
Posts: 7520
Loc: Norfolk, England
That would be the same under U.K. rules. An equipment grounding conductor (earth continuity conductor, circuit protective conductor, or any other fancy name) is not intended to carry current in normal use and is therefore not counted for derating purposes.
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#14765 - 10/01/02 03:27 PM Re: Doing my best to show my ignorance
sparky66wv Offline
Member
Registered: 11/17/00
Posts: 2232
Loc: West Virginia
Trainwire, you know I've been there! That describes me every moment of every day at work!

It's great that ECN accepts our questions without flames or ridicule.

And you'll never beat me on the ignorance thing! Scott35 and myself have been arguing over who is the self-appointed ECN village idiot for well over a year now... I think I got him beat hands down!

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-Virgil
Residential/Commercial Inspector
5 Star Inspections
Member IAEI
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#14766 - 10/02/02 07:16 AM Re: Doing my best to show my ignorance
Trainwire Offline
Member
Registered: 03/15/02
Posts: 360
Loc: Strasburg,PA,USA
Thanks 66WV, that maks me feel a little better.
Train
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#14767 - 10/03/02 09:21 PM Re: Doing my best to show my ignorance
Scott35 Offline

Broom Pusher and
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Registered: 10/19/00
Posts: 2707
Loc: Anaheim, CA. USA
Virgil,

And you'll never beat me on the ignorance thing! Scott35 and myself have been arguing over who is the self-appointed ECN village idiot for well
over a year now... I think I got him beat hands down!


LOL!!!

Once again I will always be the reigning ECN Village Idiot!!!
Could use a few Proteges to Mentor

On a semi-related note, still need to create an Animated GIF with Dunce Cap or growing Donkey Ears. What was that App for making said .gif files? Does Paint Shop Pro's Animation Gallery have this? [haven't explored too much]

Scott S.E.T.
aka "Don-key Jotte (Don Quijote, or however it's spelled)
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Scott " 35 " Thompson
Just Say NO To Green Eggs And Ham!
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