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Joined: Jan 2005
Posts: 91
H
Member
Can anyone please help me understand the purpose/meaning behind this article?

2017 / 2014 NEC & Related Books and Study Guides
Joined: Jan 2005
Posts: 5,316
Cat Servant
Member
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.

Joined: Jul 2004
Posts: 9,673
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G
Member
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
Joined: Mar 2007
Posts: 101
M
Member
It is telling the installer that if you run a neutral ( grounded ) conducter you must terminate that conducter

Joined: Mar 2003
Posts: 849
Y
Member
See 250.24 C


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