Multiple voltages

[greatjohn9]

Can you have multiple voltages such as single phase 208 and 120 in the same conduit that come from the same panel

 

[roger]

Yes you can. You'll have this scenario anytime you run a Multi-Wire Branch Circuit.

Roger

 

[greatjohn9]

ok thats what i thought do you have a code referece by chance

 

[roger]

210.4 for one.

BTW, welcome to the forum.

Roger

 

[greatjohn9]

thanks i here that there is great info on here

 

[augie47]

But be sure to look at 210.5 and 200.6(D) also

 

[infinity]

You also can have circuits from different panels or different services for that matter within the same conduit.

 

[kacper]

Can you have multiple voltages such as single phase 208 and 120 in the same conduit that come from the same panel

Sure u can. keep in mind the derating factor starting from 4 current car. conductors:
4?6 80
7?9 70
10?20 50
21?30 45
31?40 40
41 and above 35 (percent)

 

[nyhockey]

What about 300.3(C)(1) 600 Volts, Normal, or Less.
Says as long as the insulation is rated to the highest voltage you can mix any voltage under 600 volts, AC or DC

But in NYC voltages over 250v can not . 300.3(C)(1) Ex. No. 2

 

[augie47]

What about 300.3(C)(1) 600 Volts, Normal, or Less.
Says as long as the insulation is rated to the highest voltage you can mix any voltage under 600 volts, AC or DC

But in NYC voltages over 250v can not . 300.3(C)(1) Ex. No. 2

Art 725 shoots a hole in assuming any mix is allowable if the insulation rating is high enough.

 

[infinity]

What about 300.3(C)(1) 600 Volts, Normal, or Less.
Says as long as the insulation is rated to the highest voltage you can mix any voltage under 600 volts, AC or DC

But in NYC voltages over 250v can not . 300.3(C)(1) Ex. No. 2

Care to explain what this NYC amendment to the NEC means?

[FONT=TimesNewRoman,BoldItalic][FONT=TimesNewRoman,BoldItalic]ARTICLE 300[/FONT]
[FONT=TimesNewRoman,BoldItalic]Wiring Methods[/FONT]
[FONT=TimesNewRoman,BoldItalic]SECTION 300.3[/FONT]
[/FONT][FONT=TimesNewRoman,Italic][FONT=TimesNewRoman,Italic]Subsection 300.3(C)(1) - Add a new Exception No. 2 to read as follows:[/FONT][/FONT]
[FONT=TimesNewRoman,Italic][FONT=TimesNewRoman,Italic]Exception No. 2: Barriers shall be provided to isolate conductors energized from[/FONT][/FONT][FONT=TimesNewRoman,Italic]
[FONT=TimesNewRoman,Italic]different sources when system voltage exceeds 250 volts nominal and conductors are[/FONT]​

[FONT=TimesNewRoman,Italic]protected by first or second level overcurrent protective devices. Sources include service [FONT=TimesNewRoman,Italic]
[FONT=TimesNewRoman,Italic]entrance points, secondaries of different transformers, generators and UPS systems.[/FONT]
[/FONT][/FONT][/FONT]

 

[nyhockey]

Being a installer not a writer, I can only assume that the powers that be, do not want 110/208v in the same conduit as 277/480v:-?

 

[nyhockey]

Art 725 shoots a hole in assuming any mix is allowable if the insulation rating is high enough.

Yes it does, but if Art 300.3(C)(1) has some rules, don't we follow the tuffer ART?

 

[augie47]

I don't think we judge which one can beat up the other one
You have to follow the applicable Article. Art 300 in General Wiring Practice. Special conditions, such as Art 700, take precedence when applicable. Same as Pool Wiring sets forth specific rules.

 

[nyhockey]

In NYC the Harder Art always wins

 

[e57]

Being a installer not a writer, I can only assume that the powers that be, do not want 110/208v in the same conduit as 277/480v:-?

Hard enought to figure out what they wrote or accepted - never mind what they think....