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Roof Mounted AC Units, Mechanical Code Rules? #153572 10/20/03 05:43 AM
Joined: Oct 2000
Posts: 2,749
Joe Tedesco Offline OP
Member
[Linked Image]

NEC working space violations are clear, but what about the other systems used here, do they violate some other rules?

Also, how does the Mechanical Code cover the required rooftop receptacle and protection for the thermostat wires?


Joe Tedesco, NEC Consultant
Building Codes & Related References
Re: Roof Mounted AC Units, Mechanical Code Rules? #153573 10/20/03 11:22 AM
Joined: May 2002
Posts: 1,716
R
Roger Offline
Member
Joe, I know it's common to see stat wire tied to the mechanical piping, and I've never heard of it being tagged.

Roger

Re: Roof Mounted AC Units, Mechanical Code Rules? #153574 10/20/03 12:24 PM
Joined: Oct 2000
Posts: 2,749
Joe Tedesco Offline OP
Member
Roger:

That's true and is permitted by the NEC:

Quote
300.11(B)(2) Where the raceway contains power supply conductors for electrically controlled equipment and is used to support Class 2 circuit conductors or cables that are solely for the purpose of connection to the equipment control circuits

My question was related to a rule I remember being in the UMC calling for protection in a raceway.

Personally, I don't like seeing the thermostat wires installed as you describe, and as the code will permit, because it can be cut easily and may be the cause of a loss of life when someone is relying on AC or Heat to stay alive. That's one of the reasons why those circuit cannot be put into the same raceway as described in the reference in the FPN to 300.3(C)(1) .....


Joe Tedesco, NEC Consultant

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