Definition of ungrounded conductors and feeder


Senior Member
Understand had some sort of previous post regarding menu board drive thru sign but it closed without having any NEC 2014 reference as to what ungrounded conductors are and now I am having difficult time applying it to which cables since menuboards have both communication cable in one conduit and power cables second conduit

Question1. Is their a definition of ungrounded conductors in the NEC 2014? Do communication cables have ungrounded cables or just power cables do? It is not clear. The reason is NEC 2014 section 600.6 just says disconnect ungrounded conductors so not sure what it means.

Question2. Also NEC 2014 section 600.6 says feeders. Are communication cables count as feeders?
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Master Electrician Electric Contractor Richmond VA
Henrico County, VA
Electrical Contractor
Only power wiring; specifically, wires (intentionally) carrying voltage relative to a grounded conductor and/or earth.


Senior Member
Kent, WA
The way I read 600.6 it says each system, or feeder circuit, or branch circuit supplying the thing must have a disconnect. I don't see a requirement to disconnect any communications wiring and especially not simultaneously. Depending on the communications signal, there may be other articles requiring it be disconnected. Would probably depend on if it is a network cable, class 1, class 2, or class 3 circuit, or what not.

As far as ungrounded is defined in article 100, all circuits must have some ungrounded conductors. If all were grounded, they would all be shorted out and not function. In something like an ethernet connection, all of the conductors are ungrounded. Control/comm signals many times have a connector which can be pulled. I could see this like a cord-and-plug disconnect if a disconnect is required.