ElectricPersonality
Member
- Location
- Philadelphia, PA
Is a class 2 power limited circuit required to be in conduit?
class 2 power limited circuit?
- Thread starter ElectricPersonality
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- New Jersey
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No. Think about things like a door bell switch or zone valves on a boiler.
ryan_618
Senior Member
- Location
- Salt Lake City, Utah
dnem said:
What is the power supply? See 411.4
hbiss
EC, Westchester, New York NEC: 2014
- Location
- Hawthorne, New York NEC: 2014
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- EC
How about Honeywell CL-2 wiring run in the wall for LV cabinet lights?
The wiring would depend on the power supply. If it is indeed a CL2 supply then the wiring is covered by Art 725 and does not have to be in conduit. Note that you have to use a wire that is listed on the jacket as CL2 or CL3, not zip cord or landscape lighting cable.
-Hal
The wiring would depend on the power supply. If it is indeed a CL2 supply then the wiring is covered by Art 725 and does not have to be in conduit. Note that you have to use a wire that is listed on the jacket as CL2 or CL3, not zip cord or landscape lighting cable.
-Hal
hbiss
EC, Westchester, New York NEC: 2014
- Location
- Hawthorne, New York NEC: 2014
- Occupation
- EC
The "listed Class 2 power source" of 411.4(A)(2) must comply with Table11(A) & (B) of chapter 9 on page 638. Note the amperage limitation of the power supply. Power supply will be inspected on final.
First, I assume you have adopted the 2005 NEC. Second I assume you have the test equipment to perform the required testing to see that the power supply conforms to Table 11.
Better idea: Just look to see that the power supply label says "CL2 wiring may be used" or just CL2. If it does not the wiring must be a class 1 method.
-Hal
First, I assume you have adopted the 2005 NEC. Second I assume you have the test equipment to perform the required testing to see that the power supply conforms to Table 11.
Better idea: Just look to see that the power supply label says "CL2 wiring may be used" or just CL2. If it does not the wiring must be a class 1 method.
-Hal
hbiss
EC, Westchester, New York NEC: 2014
- Location
- Hawthorne, New York NEC: 2014
- Occupation
- EC
Read those tables. There is a lot more to it than current or wattage. Is it an inherently or non-inherently current limited source for instance.
That table used to be part of 725 and now it's been moved to the back of the book. Hopefully in the '08 edition it will be gone. It really has no purpose except for manufacturers as an overview in designing their power sources. The testing can be complex and now is usually left up to UL or other testing laboratory to provide a listing of CL1, CL3 or CL2. All power sources (with the exception of discrete batteries) are required to indicate on their label whether they are CL1, 3 or 2. Understand also that you may be talking about a simple transformer here but any source of power such as a battery, a regulated DC supply and even an audio amplifier that connects to speakers must be tested for compliance and listed.
As I said, all anybody has to do is just look at the listing on the label. That's what it's there for.
-Hal
That table used to be part of 725 and now it's been moved to the back of the book. Hopefully in the '08 edition it will be gone. It really has no purpose except for manufacturers as an overview in designing their power sources. The testing can be complex and now is usually left up to UL or other testing laboratory to provide a listing of CL1, CL3 or CL2. All power sources (with the exception of discrete batteries) are required to indicate on their label whether they are CL1, 3 or 2. Understand also that you may be talking about a simple transformer here but any source of power such as a battery, a regulated DC supply and even an audio amplifier that connects to speakers must be tested for compliance and listed.
As I said, all anybody has to do is just look at the listing on the label. That's what it's there for.
-Hal
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