Class 1 and PLT

[rsmieja]

As I read Article 725.21, a Class 1 Circuit can be either power-limited (not more then 30 volts and 1000va) or Remote-Control and Signaling (not more then 600v and av not limited).

My question is as a PLT can I work on Class 1 Remote-Control and Signaling circuits?

Can a Remote-Control and Signaling circuit be powered by a power-limited circuit?

Is a standard outlet and lights Class 1 or something else?

Thanks, Ron

 

[hbiss]

Re: Class 1 and PLT

Yes, outlets and light are class 1. As for your question it all depends on your licensing jurisdiction as to what is allowed, not allowed and where they draw the line.

-Hal

[ November 14, 2005, 05:08 PM: Message edited by: hbiss ]

 

[don_resqcapt19]

Re: Class 1 and PLT

Power and lights are lighting and power circuits. They are not Article 725 Class 1 circuits.
Don

[ November 14, 2005, 05:30 PM: Message edited by: don_resqcapt19 ]

 

[rsmieja]

Re: Class 1 and PLT

I am trying to understand what a Clas 1 circuit would look like. Per Article 725.2 "Class 1 Circuit. The portion of the wiring system between the load side of the overcurent device or power-limited supply and the connected equipment."

What is the definition or example of "overcurent device". Would this be a circuit bracker?

If it is, wouldn?t this be a part of the lighting and power circuits?

Can anyone give me an example of a class 1 circuit for none power limited and power limited?

Ron

 

[pierre]

Re: Class 1 and PLT

Ron
You are an IT guy. You really need training other than what you may be trying to get here. If not you are liable to make some incorrect decisions when making your installations, and injuring yourself or others.

 

[rsmieja]

Re: Class 1 and PLT

I am looking for a clear definition to what "Class 1 circuit is". I feel the NEC book does not do that. I also purchased the "Understanding low-voltage and power-limited system" book from this site and it also fail to show it.

In the "Understanding low-voltage and power-limited system" book Figure 725-3 shows a Class 1 Power-Limited Circuit but fails to show how it is connected unlike figure 725-1 and 725-2. I do not see any example of a Class 1 "Remote-control and signaling circuit.

I am sure this is all to simple of a question. Just looking for the simple answer.

Ron

 

[pierre]

Re: Class 1 and PLT

Ron
If this is such a simple question, how come all of your research has come up without helping you.
That is why my first post to you is what I am sticking to.

 

[tom baker]

Re: Class 1 and PLT

There are two types of Class 1 circuits, power limited and non power limited. A non power limited circuit would be typically a motor control circuit. Its a chapter 3 wiring method, but with the rules relaxed on derating due to conductor fill. A class 1 non power limited circuit is called a class 1 remote control and signaling circuit
Look in art 100 for the definitions for remote control and signaling. Thats what its used for.
See part II of art 725

 

[rsmieja]

Re: Class 1 and PLT

Thanks Tom,

That helps me.

I thought the term "Class 1 non power limited was the same thing as remote control and signaling circuit but did not see that printed in the book like that.

I see the term "remote-control signaling used in some areas and non power limited in other parts. They just don't put the two tegether letting you know they are the same.

Thanks again.

 

[hbiss]

Re: Class 1 and PLT

725.21(A) Class 1 Power Limited Circuits. These circuits shall be supplied from a source that has a rated output of not more than 30 volts and 1000 volt-amperes.

725.21(B) Class 1 Remote-Control and Signaling Circuits These circuits shall not exceed 600 volts. The power output of the source shall not be required to be limited.

Gee, looks pretty clear to me. You are in over your head if you can't understand this.

-Hal