The Electrical Contractor Network

ECN Electrical Forum
Discussion Forums for Electricians, Inspectors and Related Professionals

Books, Tools and Test Equipment for Electrical and Construction Trades

Register Now!

Register Now!

We want your input!

Featured:
   

2017 NEC and Related
2017 NEC
Now Available!

   
Recent Posts
Industrail Control Panel bonding per 409.108
by sparkyinak
Yesterday at 06:29 PM
Calling all Non-US members!! (Non-US only)
by aussie240
12/07/16 02:39 AM
Photo Upload Tutorial
by DanK
12/06/16 11:35 PM
Sprinklered equipment 26-008
by bigpapa
12/02/16 04:24 PM
On Delay Relay with Auto Reset
by Potseal
12/01/16 09:59 AM
New in the Gallery:
12.5A through 0.75mm˛ flex (just out of curiosity)
Shout Box

Top Posters (30 Days)
gfretwell 13
HotLine1 10
Texas_Ranger 8
sparkyinak 8
Potseal 6
Who's Online
2 registered (crselectric, mbhydro), 232 Guests and 4 Spiders online.
Key: Admin, Global Mod, Mod
Topic Options
Rate This Topic
#153572 - 10/20/03 03:43 AM Roof Mounted AC Units, Mechanical Code Rules?
Joe Tedesco Offline
Member

Registered: 10/07/00
Posts: 3325
Loc: Boston, Massachusetts USA


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

Top
Building Codes & Related References
#153573 - 10/20/03 09:22 AM Re: Roof Mounted AC Units, Mechanical Code Rules?
Roger Offline
Member

Registered: 05/18/02
Posts: 1779
Loc: N.C.
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

Top
#153574 - 10/20/03 10:24 AM Re: Roof Mounted AC Units, Mechanical Code Rules?
Joe Tedesco Offline
Member

Registered: 10/07/00
Posts: 3325
Loc: Boston, Massachusetts USA
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

Top



ECN Electrical Forums - sponsored by Electrical Contractor Network - Electrical and Code Related Discussion for Electrical Contractors, Electricians, Inspectors, Instructors, Engineers and other related Professionals