shunt trip for elevators

[copper chopper]

Is there any code that states I cant run the 2 #12 wires for the shunt trip in the same conduit as the feeder for that elevator car???:slaphead:

 

[gadfly56]

Is there any code that states I cant run the 2 #12 wires for the shunt trip in the same conduit as the feeder for that elevator car???:slaphead:

Don't have it handy, but mixing Class 1 and Class 2/3 circuits in the same raceway is a no-no IIRC.

 

[iwire]

The derating required for over 3 current carrying conductors will reduce the ampacity of the feeder.

It makes no sense but I don't see any exceptions to get around it.

Gadfly, the shut trip would not be class 2 or3.

 

[gadfly56]

The derating required for over 3 current carrying conductors will reduce the ampacity of the feeder.

It makes no sense but I don't see any exceptions to get around it.

Gadfly, the shut trip would not be class 2 or3.

It is if it's operating off a 24 volt coil. Actually, I assumed that the pair he's talking about was running from the addressable relay module back to the elevator controller, which I admit may not be what he was saying.

 

[iwire]

It is if it's operating off a 24 volt coil. Actually, I assumed that the pair he's talking about was running from the addressable relay module back to the elevator controller, which I admit may not be what he was saying.

The only shunt trip breakers I have installed have all had 120 VAC trip coils.

We would be running that 120 VAC through an addressable fire alarm relay.

 

[fmtjfw]

NO derating required

NO derating required

725.51(B)(2)

 

[iwire]

725.51(B)(2)

2011 NEC

725.51(B)(2)

(B) Power-Supply Conductors and Class 1 Circuit Conductors.
Where power-supply conductors and Class 1 circuit
conductors are permitted in a raceway in accordance
with 725.48, the number of conductors shall be determined
in accordance with 300.17. The ampacity adjustment factors
given in 310.15(B)(3)(a) shall apply as follows:



(2) To the power-supply conductors only, where the Class
1 circuit conductors do not carry continuous loads in
excess of 10 percent of the ampacity of each conductor
and where the number of power-supply conductors is
more than three

Thanks.

 

[don_resqcapt19]

It is if it's operating off a 24 volt coil. ...

Maybe not. Just because it is a 24 volt system does not automatically mean that it is a class 2 system. It is only a class 2 system if the power supply is a listed class 2 power supply.

 

[copper chopper]

thank you iwire and you are correct it is 120 volt coils . so I will pull them in with the feeder, this saves me about 200 feet of 1/2" conduit and labor to install it...

 

[fmtjfw]

2011 NEC


Thanks.

I put that every year on the WV SkillsUSA Motor Controls test written part. It's in an article lots of people never look at. As the OP said, it can save you time and money.

 

[iwire]

I put that every year on the WV SkillsUSA Motor Controls test written part. It's in an article lots of people never look at. As the OP said, it can save you time and money.

I knew about the section, I just totally forget I can choose to call the circuit class 1. I keep thinking it would have to come from a 'Class 1 power supply' but that is not the case.

Good idea to have it on a test.