Multiconductor flexible cord.

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mprairie

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Originally posted in NEC Questions and Answers Newsletter June:
When sizing multiconductor flexible cable for ampacity, are conductors intended for control circuits considered to be current carrying conductors?

Example:12AWG 6 conductor sow where three conductors are power, one conductor is equipment ground and two conductors connect thermal switches in a motor to a 120v control circuit in an MCC.

Mark
 
What is the control circuit fused at? Usually that would be low enough where you would not heat those 2 wires for the control. I would consider that as 3 current carrying conductors.

How far is motor from MCC? We typically have conduit run to close proximity of motor with last short distance in FNC or junction box with SOW to motor.
 
Multiconductor flexible cord

Multiconductor flexible cord

don_resqcapt19 said:
Take a look at Exception #1 to 310.15(B)(2)(a).
Click to expand...
Don,
Exception 1 uses the term "lighting", am I correct in assuming that a control circuit does not constitute a lighting or power (including ground) circuit?
My original question is derived from having to size cable for submersible electric pumps, where cable diameters become critical due to the fact that the diameters involve seals for the cable entry.
Cable manufacturers list ampacity based on NEC tables, where an increase in the number of conductors will decrease the published ampacity.
There are multiconductor cables with mixed conductor sizes ( hard to get) and difficult (for me) to size correctly.
 
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