low voltage wiring?

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First of all, realize that the NEC does not use the term low voltage.
It uses Class 1, 2 3 remote control, signaling and power limited circuits
The most common type of "Low Voltage" is Class 2. That wiring method requires a Class 2 cable or a chapter 3 wiring method.
 
If you doing any low volt lights do a search on this web site for such. There are a lot of misconceptions, problems and violations involved with these systems.
 
Ok, 12volt secondary system off a 120volt primary x-fmr. Manufacture instructions recommend the use of SINGLE "THHN" wire for secondary wiring to keep 90 degree rating. What would you interpret that as? I interpret it as single pieces of "THHN" on the secondary wiring. Am I wrong to think that?
 
Re: low voltage wiring?

chevyx92 said:
Are you allowed to run "THHN" for low voltage wiring?
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Yes, I am allowed to run THHN* for low voltage wiring and I don't need to put it in a raceway. You may not be allowed to do this.

I work in the motorhome industry, where low-voltage wiring is governed by the RVIA Standard for Low-Voltage Systems, rather than the NEC. The RVIA standard is, for the most part, considerably less stringent than the NEC.

*But it must be stranded wire, not solid.
 
SteveD
So are you saying that Art 551 does not apply?
Also I was wrong the NEC does have a defintion of Low Voltage in Art 551.
 
At some point in time the low-voltage portions of article 551 were removed from the NEC. Article 551 of the 1996 NEC covered low-voltage wiring, but article 551 of the 2005 NEC does not. I don't have a '99 or '02 codebook, so I'm not sure when the change took place. The RVIA standard seems to be similar to what used to be in the NEC; in fact some of it is copied word-for-word.
 
steved said:
At some point in time the low-voltage portions of article 551 were removed from the NEC. Article 551 of the 1996 NEC covered low-voltage wiring, but article 551 of the 2005 NEC does not. I don't have a '99 or '02 codebook, so I'm not sure when the change took place. The RVIA standard seems to be similar to what used to be in the NEC; in fact some of it is copied word-for-word.
Click to expand...

That would have been 551.10 and it's in the 99 code. I see the infamous dot after 550.4 in my 05 before it goes to 550.20, so something was removed there. My 02 book is in the van and I ain't heading out to retrieve it right now.
 
Art 411 requires a Chapter 3 wiring method.
Section 310.13 and Table 310.13 are conductor construction and applications.
THHN is not a wiring method, it is a conductor type as per Table 310.13.
To locate wiring methods in Chapter 3, you can start at Art 320 and move forward from there.

In the 2002 and the 2005 NEC on page 3 of the Table of Contents, the left column list most of the wiring methods of Chapter 3.
 
This is alittle of the subject, but I was wondering...

Sometimes when I can't get bare ground wire for the GEC, I will run THHN for my GEC and staple it to the sill without and raceway. Now, since THHN is listed in 310.13, would this be a violation of 300.3?

shortcircuit2

ps. I like them penguins Ryan_618 :lol:
 
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