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Mixing voltages, marking requirements #61143
01/17/06 09:16 PM
01/17/06 09:16 PM
H
highground  Offline OP
Member
Joined: Nov 2004
Posts: 53
Chama, NM
What exactly is required when mixing voltages, ie. 208 & 277 in the same J-Boxes and conduits.
As far as labeling, color codes etc.
I know what is preferable, but what is required by code.
Thanks in Advance.

Work Gear for Electricians and the Trades
Re: Mixing voltages, marking requirements #61144
01/17/06 09:52 PM
01/17/06 09:52 PM
renosteinke  Offline
Cat Servant
Member
Joined: Jan 2005
Posts: 5,316
Blue Collar Country
They need to be separated by a non-conductive barrier.

Re: Mixing voltages, marking requirements #61145
01/17/06 09:59 PM
01/17/06 09:59 PM
I
iwire  Offline
Moderator
Joined: Jan 2003
Posts: 4,391
North Attleboro, MA USA
No barrier is required unless two devices in the same box have more than 300 volts between them.


Bob Badger
Construction & Maintenance Electrician
Massachusetts
Re: Mixing voltages, marking requirements #61146
01/17/06 10:50 PM
01/17/06 10:50 PM
electure  Offline

Member
Joined: Dec 2000
Posts: 4,274
Fullerton, CA USA
.....And at least one of those devices is a snap switch

Re: Mixing voltages, marking requirements #61147
01/18/06 12:16 AM
01/18/06 12:16 AM
J
JoeTestingEngr  Offline
Member
Joined: Nov 2005
Posts: 794
Chicago, Il.
Don't all of the conductors have to have an insulation rating appropriate for the highest voltage used?
Joe

Re: Mixing voltages, marking requirements #61148
01/19/06 10:17 AM
01/19/06 10:17 AM
electure  Offline

Member
Joined: Dec 2000
Posts: 4,274
Fullerton, CA USA
Yes, they do.
All of the Building Wire that I'm accustomed to working with has insulation rated at 600V, so it would qualify for highground's original query.

Now my question:
What is the insulation rating of Cat5/Cat6 etc. cable?
How about Bell Wire/Thermostat Wire?

Re: Mixing voltages, marking requirements #61149
01/19/06 02:42 PM
01/19/06 02:42 PM
mxslick  Offline
Member
Joined: Oct 2004
Posts: 803
Atomic City, ID USA
Quote
Now my question:
What is the insulation rating of Cat5/Cat6 etc. cable?
How about Bell Wire/Thermostat Wire?


Most CAT5/6 I've seen is rated at 300 volts. I'll check back on the new CAT6 I just used on a job, it's in the warehouse...

I've seen t-stat wire at both 150v and 300 volts. Not sure about bell wire.

Anyone? Anyone? Bueller? Bueller? [Linked Image]


Stupid should be painful.
Re: Mixing voltages, marking requirements #61150
01/19/06 03:19 PM
01/19/06 03:19 PM
R
resqcapt19  Offline
Member
Joined: Nov 2000
Posts: 2,148
IL
Quote
What exactly is required when mixing voltages, ie. 208 & 277 in the same J-Boxes and conduits.
As far as labeling, color codes etc

See 210.5 in the 2005 NEC.
Don

the code section should be 210.5(C)

[This message has been edited by resqcapt19 (edited 01-19-2006).]


Don(resqcapt19)
Re: Mixing voltages, marking requirements #61151
01/19/06 03:22 PM
01/19/06 03:22 PM
R
resqcapt19  Offline
Member
Joined: Nov 2000
Posts: 2,148
IL
Quote
What is the insulation rating of Cat5/Cat6 etc. cable?
How about Bell Wire/Thermostat Wire?

Then you have to look at 725.55(A). Even if the communications and controls cables have a voltage rating higher than that of the power conductors, you still can't mix them in the same raceway.
Don


Don(resqcapt19)
Re: Mixing voltages, marking requirements #61152
01/22/06 02:18 PM
01/22/06 02:18 PM
T
Tom H  Offline
Member
Joined: Jan 2005
Posts: 74
Milford, Ct, USA
725.55(D) allows for mixing voltage class wires so long as the class 2 wires pertain to a device in that box. A nice one for lighting control systems.

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