NEC

[Redskinsdb21]

Does anyone know whats considered high, medium or low voltage in NEC?

 

[jcbabb]

The answer to that is a bit muddy, and depends on if you're speaking of wiring or gear. I don't think you'll find a clear cut answer.

IEEE has a more defined standard, but they classify low voltage as 600V and below, which ignores the NEC's separation of wiring that is <24 volts.

 

[pbo064]

I don't think this came out of the NEC, but this worked for all my sample tests:

Low Voltage <1000V

Medium Voltage 1kV-100kV

High Voltage 100.1 kV-230 kV

Extra High Voltage >230 kV

 

[PE blues]

If you have Wildi text books, it's mentioned in one of the distribution chapters

 

[Redskinsdb21]

I have the IEEE values, just thought NEC had their own values as well..maybe im worng

 

[Wildsoldier PE]

You can find this in the wildi book

 

[jcbabb]

NEC does have their own values, but they are not cut and dry, and they vary per article depending on how they're used.