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725.52(A) Ex. #2 #79453 12/27/01 10:27 PM
Joined: Nov 2000
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resqcapt19 Offline OP
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What does this new exception mean? Does it throw out 725.55?
Don(resqcapt19)


Don(resqcapt19)
2017 / 2014 NEC & Related Books and Study Guides
Re: 725.52(A) Ex. #2 #79454 12/28/01 08:53 AM
Joined: Dec 2000
Posts: 4,283
electure Offline
Member
Being that the circuit is reclassified as a Class 1 circuit, it sure does look like it would invalidate 725.55

Re: 725.52(A) Ex. #2 #79455 01/01/02 12:11 AM
Joined: Dec 2001
Posts: 270
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Elzappr Offline
Member
This is an interesting change. I was taught to think that ONE reason for all the efforts to separate class 2 and 3 wiring from class 1 and power wiring was to protect the technician who thinks he is only dealing with 24 volts from inadvertently getting nailed with higher voltages. I guess this change pretty much nullifies that notion. All they must be concerned with is fire, induction, and fire/smoke characteristics of unprotected cabling!

Re: 725.52(A) Ex. #2 #79456 01/01/02 11:31 AM
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Glenn Offline
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How can a Class 2 system which was installed by using Class 2 wiring become a Class 1 system just by removing the Class 2 marking on the system?

Would not the system need to be re-wired using 600 volt wiring and Chapter 3 wiring methods as per 725.27(B) ?

Re: 725.52(A) Ex. #2 #79457 01/01/02 11:51 AM
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resqcapt19 Offline OP
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Just changing the the wiring method doesn't make a Class 2 system a Class 1 system. I realy have no idea what CMP 16 was trying to do here. If this is applied in the way that it reads, it does away with 725.55 and I don't think that is the intent.
Don(resqcapt19)


Don(resqcapt19)
Re: 725.52(A) Ex. #2 #79458 01/01/02 11:52 AM
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Posts: 1,044
Tom Offline
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Glenn,

I think the key phrase in this is "installed as Class 1 circuits." This, as you point out, would require the use of an article 300 wiring method.

I can't imagine why someone would want to just go out & change & existing Class 2 or 3 installation, but there are plenty of times in new work where going to Class 1 makes sense.

This issue was posed at an IAEI chapter meeting several years ago (can't remember which chapter & when) & the response was split about evenly.

If the entire installation complies with Class 1 wiring requirements with an article 300 wiring method, I don't see the hazard that would be introduced. When I see an article 300 wiring method, I presume I'm dealing with at least 120 volts. On the other hand, I have seen lighting outlets wired with doorbell wire and telephone wire. What a surprise that would have been for someone if they cut the cable!

Don, sometimes I think the new code books should come with a deck of Tarot cards.

Tom

[This message has been edited by Tom (edited 01-01-2002).]


Few things are harder to put up with than the annoyance of a good example.
Re: 725.52(A) Ex. #2 #79459 01/01/02 12:26 PM
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Glenn Offline
Member
Maybe the 725.52(A) text and the FPN text should just remove words " reclassified and ".

Now the circuit is being installed as a Class 1 .


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