ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
ShoutChat Box
Recent Posts
Thought this was funny
by Ronny - 12/03/20 06:08 PM
From an outsider- How does tipping work?
by gfretwell - 12/02/20 02:38 PM
Happy Thanksgiving
by Trumpy - 12/02/20 04:11 AM
Where is Everyone?
by Trumpy - 12/02/20 03:51 AM
What does your work place look like?
by Trumpy - 12/02/20 03:42 AM
New in the Gallery:
Facebook follies, bad wiring
FPE in Germany pt.2
Who's Online Now
0 registered members (), 21 guests, and 14 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
Roof Mounted AC Units, Mechanical Code Rules? #153572 10/20/03 05:43 AM
Joined: Oct 2000
Posts: 2,749
Joe Tedesco Offline OP
[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
Roger Offline
Joe, I know it's common to see stat wire tied to the mechanical piping, and I've never heard of it being tagged.


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

That's true and is permitted by the NEC:

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


2020 National Electrical Code
2020 National Electrical
Code (NEC)

* * * * * * *

2020 Master Electrician Exam Preparation Combos
2020 NEC Electrician
Exam Prep Combos:
Master / Journeyman


Member Spotlight
Posts: 22
Joined: August 2009
Show All Member Profiles 
Top Posters(30 Days)
Trumpy 20
Popular Topics(Views)
272,219 Are you busy
206,111 Re: Forum
194,102 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.7.3