- Location
- Chapel Hill, NC
- Occupation
- Retired Electrical Contractor
I was told by a wire company that if I could use class 3 wiring for the low voltage system that is rated class 2. Is this true?
I was told by a wire company that if I could use class 3 wiring for the low voltage system that is rated class 2. Is this true?
there is a confusing matrix of wiring methods for class 2 and 3 wiring.
it seems like most of the stuff used in class 3 wiring can indeed also be used in class 2 wiring.
i can't recall ever doing any class 3 wiring though.
That is exactly what I see so IMO class 3 can be used and I am going with it. I did talk to a very knowledgeable inspector in Durham who said the same thing.The only thing I could find was in the definition 725.2 class 3 circuit. It says C3 are permitted to have higher levels of voltage than C2.
Here is what I don't understand about this. I can run this class 3 wire thru the walls and connect to a low voltage system that does not have a wiring compartment- lights with tails sticking out or leads if you will. I can just use wire nuts however if I run NM cable, mc cable-- and do the same then it is a violation. At least that is my understanding
725.3 Other Articles. Circuits and equipment shall comply
with the articles or sections listed in 725.3(A) through
(J). Only those sections of Article 300 referenced in this
article shall apply to Class 1, Class 2, and Class 3 circuits.
725.130 Wiring Methods and Materials on Load Side of
the Class 2 or Class 3 Power Source. Class 2 and Class 3
circuits on the load side of the power source shall be permitted
to be installed using wiring methods and materials in
accordance with either 725.130(A) or (B).
(A) Class 1 Wiring Methods and Materials. Installation
shall be in accordance with 725.46.
725.46 Class 1 Circuit Wiring Methods. Class 1 circuits
shall be installed in accordance with Part I of Article 300
and with the wiring methods from the appropriate articles
in Chapter 3.
Found it. 2011 Table 725.179Cable markings In the informational Note: .....and Class 3 cables are listed above Class 2 cables because Class 3 cables can substitute for Class 2 cables.
I
So if we start with a Class 2 or 3 circuit and call it a Class 1, can we then use Art. 310 to select the wire?
My understanding is if you start with a Chapter 3 wiring method then you must follow those rules.