Control wires CCC?

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Twoskinsoneman

Twoskinsoneman

Senior Member
Location
West Virginia, USA NEC: 2020
Occupation
Facility Senior Electrician
This sounds like a dumb question but do you count control wires as current carrying conductors? I want to run some control wires in the same conduit as power wires but I'm not completely sure if it effects the CCC count. I got this funny feeling it shouldn't but probably does.
 
raider1 said:
Take a look at Exception #1 to 310.15(B)(2).

Chris
Click to expand...

Does this situation count as a separate systems?
I'm taping off the line side of 120v contactor and remote controlling the contactor through a switch. I guess it's the same system and the exception wouldn't be allowed...
 
Twoskinsoneman said:
Does this situation count as a separate systems?
I'm taping off the line side of 120v contactor and remote controlling the contactor through a switch. I guess it's the same system and the exception wouldn't be allowed...
Click to expand...

A class 1 remote control and signaling circuit can be tapped off of a contactor without power limitation in accordance with 725.21(B). If you do this you have a separate system (Class 1 remote control and signaling circuit) and the exception #1 to 310.15(B)(2) would apply. Take a look at 725.21.

Here is a quote from the NEC handbook in regards to exception #1 to 310.15(B)(2):

Exception No. 1 to 310.15(B)(2)(a) assumes that the watt loss (heating) from any
control and signal conductors in the same raceway or cable will not be enough to
significantly increase the temperature of the power and lighting conductors. See 725.26
and 725.54 for limitations on the installation of control and signal conductors in the
same raceway or cable as power and lighting conductors.
Click to expand...

Chris
 
raider1 said:
A class 1 remote control and signaling circuit can be tapped off of a contactor without power limitation in accordance with 725.21(B). If you do this you have a separate system (Class 1 remote control and signaling circuit) and the exception #1 to 310.15(B)(2) would apply. Take a look at 725.21.

Here is a quote from the NEC handbook in regards to exception #1 to 310.15(B)(2):



Chris
Click to expand...

Thanks for pointing out 725.21 (b). It makes sense now.
 
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