Building One Line Diagram

[teco]

Hello,

In commercial/industrial buildings, other than 490.48 substations, is a building power system one line diagram required by the NEC?

Thx

 

[ron]

Required for what? For permit? That would be dependent on the AHJ.

 

[cowboyjwc]

As a plan checker I will say yes, other wise how does the electrician know what to install?

 

[dkidd]

As a plan checker I will say yes, other wise how does the electrician know what to install?

OP specifically asked about NEC.

 

[teco]

I'm looking for an NEC requirement. I can find it anywhere as far as the NEC is concerned. I believe one is only required over 1000 volts.

 

[MyCleveland]

215.5...."If required by AHJ"
Like cowboyjwc stated, if you have not designed out the job....all the things asked for in 215.5, what are you installing ?

 

[Ragin Cajun]

As a design engineer, I would NEVER send out any drawing without a one line. Locally, you just don't/can't do that.

RC

 

[brian john]

I can tell you this from tracing a fault or any troubleshooting of the power system it is invaluable. AND UP TO DATE IS EVEN BETTER

 

[cowboyjwc]

215.5...."If required by AHJ"
Like cowboyjwc stated, if you have not designed out the job....all the things asked for in 215.5, what are you installing ?

There ya go.