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Joined: Nov 2004
Posts: 53
H
Member
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.

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Cat Servant
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They need to be separated by a non-conductive barrier.

Joined: Jan 2003
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I
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No barrier is required unless two devices in the same box have more than 300 volts between them.


Bob Badger
Construction & Maintenance Electrician
Massachusetts
Joined: Dec 2000
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.....And at least one of those devices is a snap switch

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J
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Don't all of the conductors have to have an insulation rating appropriate for the highest voltage used?
Joe

Joined: Dec 2000
Posts: 4,293
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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?

Joined: Oct 2004
Posts: 806
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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.
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R
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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)
Joined: Nov 2000
Posts: 2,148
R
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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)
Joined: Jan 2005
Posts: 74
T
Member
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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