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Clarification needed on Article 200.3 #203226
09/15/11 12:27 PM
09/15/11 12:27 PM
H
Helectric  Offline OP
Member
Joined: Jan 2005
Posts: 90
Brandon, SD
Can anyone please help me understand the purpose/meaning behind this article?

2017 / 2014 NEC & Related Books and Study Guides
Re: Clarification needed on Article 200.3 [Re: Helectric] #203228
09/15/11 01:41 PM
09/15/11 01:41 PM
renosteinke  Offline
Cat Servant
Member
Joined: Jan 2005
Posts: 5,316
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.

Re: Clarification needed on Article 200.3 [Re: Helectric] #203230
09/15/11 01:52 PM
09/15/11 01:52 PM
G
gfretwell  Offline

Member
Joined: Jul 2004
Posts: 9,242
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
Re: Clarification needed on Article 200.3 [Re: Helectric] #203283
09/18/11 10:16 PM
09/18/11 10:16 PM
M
mikethebull  Offline
Member
Joined: Mar 2007
Posts: 101
Rhode Island
It is telling the installer that if you run a neutral ( grounded ) conducter you must terminate that conducter

Re: Clarification needed on Article 200.3 [Re: Helectric] #203291
09/19/11 02:39 PM
09/19/11 02:39 PM
Y
Yoopersup  Offline
Member
Joined: Mar 2003
Posts: 842
Michigan
See 250.24 C


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