code for wiring compressor disconnect - Contractor Talk - Professional Construction and Remodeling Forum

72chevy4x4 · 10-01-2009, 05:15 PM

what is the code for wiring the AC compressor disconnect? height of the disconnect box and is the lead to the compressor from disconnect supposed to be armored?

spdtrx · 10-01-2009, 05:32 PM

Quote:

Originally Posted by 72chevy4x4

what is the code for wiring the AC compressor disconnect? height of the disconnect box and is the lead to the compressor from disconnect supposed to be armored?

Yes. Protected.
Disconnect in sight of condenser
Disconnect clearance min 30" wide 36" deep. NOT directly behind unit.
Disconnect max height is 79" to switch or breaker.

TimelessQuality · 10-01-2009, 05:47 PM

Quote:

Originally Posted by spdtrx

Yes. Protected.
Disconnect in sight of condenser
Disconnect clearance min 30" wide 36" deep. NOT directly behind unit.
Disconnect max height is 79" to switch or breaker.

Is there a disconnect min height?

Celtic · 10-01-2009, 10:39 PM

Quote:

Originally Posted by spdtrx

Disconnect clearance min 30" wide 36" deep.

Where is this coming from?

72chevy4x4 · 10-02-2009, 06:47 AM

Quote:

Originally Posted by spdtrx

Disconnect clearance min 30" wide 36" deep. NOT directly behind unit.

does this mean wherever the disconnect is mounted there must be open space 18" up and down (of center) and 15" left and right? what about a minimum height from ground-would that be 18"?

Magnettica · 10-05-2009, 05:46 PM

Quote:

Originally Posted by 72chevy4x4

what is the code for wiring the AC compressor disconnect? height of the disconnect box and is the lead to the compressor from disconnect supposed to be armored?

The disconnect must be placed in a readily accessible location and within sight of the equipment it is supplying. NEC 440.14

Readily accessible mostly means not higher than 6' 7" off the ground, and not behind the condensing unit where servicing the disconnect would be a PITA.

The "whip" from the disconnect to the C/U must be identified for the use and the C/U must be properly bonded using an equipment grounding conductor.

spdtrx · 10-05-2009, 06:04 PM

Quote:

Originally Posted by Magnettica

The disconnect must be placed in a readily accessible location and within sight of the equipment it is supplying. NEC 440.14

Readily accessible mostly means not higher than 6' 7" off the ground, and not behind the condensing unit where servicing the disconnect would be a PITA.

The "whip" from the disconnect to the C/U must be identified for the use and the C/U must be properly bonded using an equipment grounding conductor.

Magnettica
Thanks for your help with explaining the clearance.

I guess I need to learn how explain better.