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#203226 - 09/15/11 09:27 AM Clarification needed on Article 200.3
Helectric Offline
Member

Registered: 01/07/05
Posts: 91
Loc: Brandon, SD
Can anyone please help me understand the purpose/meaning behind this article?

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#203228 - 09/15/11 10:41 AM Re: Clarification needed on Article 200.3 [Re: Helectric]
renosteinke Offline
Cat Servant
Member

Registered: 01/22/05
Posts: 5305
Loc: Blue Collar Country
Looks to me that they are saying "no neutral in with the service, no neutral allowed inside the building." Guess they don't want you to count on the loads being perfectly balanced, or using the ground rod instead of a neutral.

Keep in mind that the NEC is attempting to address EVERY scenario. For example, the mill I'm at today is fed by the PoCo with three high-voltage 'hots.' There's no neutral from the PoCo. This means that we need a transformer to 'create' that neutral.

A lot of wells and pump houses are served by 'corner grounded' 3-phase power. If you want to have a neutral in that pump house, you'll need a transformer .... even if it's a "240 to 240" transformer.

After all, the electricity can't "go home" if the neutral wire doesn't go all the way back to the source.

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#203230 - 09/15/11 10:52 AM Re: Clarification needed on Article 200.3 [Re: Helectric]
gfretwell Offline

Member

Registered: 07/20/04
Posts: 9045
Loc: Estero,Fl,usa
This is what the handbook comment says.

Quote:
Grounded conductors of premises wiring must be connected to the supply system (service or applicable separately derived system) grounded conductor to ensure a common, continuous, grounded system.
_________________________
Greg Fretwell

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#203283 - 09/18/11 07:16 PM Re: Clarification needed on Article 200.3 [Re: Helectric]
mikethebull Offline
Member

Registered: 03/18/07
Posts: 101
Loc: Rhode Island
It is telling the installer that if you run a neutral ( grounded ) conducter you must terminate that conducter

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#203291 - 09/19/11 11:39 AM Re: Clarification needed on Article 200.3 [Re: Helectric]
Yoopersup Offline
Member

Registered: 03/04/03
Posts: 826
Loc: Michigan
See 250.24 C

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