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Joined: Nov 2004
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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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They need to be separated by a non-conductive barrier.
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Joined: Jan 2003
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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
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.....And at least one of those devices is a snap switch
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Don't all of the conductors have to have an insulation rating appropriate for the highest voltage used? Joe
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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?
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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?
Stupid should be painful.
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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)
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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)
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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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