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
230 or 345 kV transmission lines?
by Vlado
09/24/16 09:33 AM
breaker meltdown
by crselectric
09/24/16 12:42 AM
Electrical mast flashing product
by ThomasWinfrey
09/22/16 12:14 AM
What estimating software do you recommend?
by sparky
09/21/16 07:20 PM
"Dry Run" Inspection goes awry
by HotLine1
09/20/16 07:39 PM
New in the Gallery:
12.5A through 0.75mm˛ flex (just out of curiosity)
Shout Box

Top Posters (30 Days)
HotLine1 15
sparky 9
gfretwell 8
sparky66wv 8
Vlado 6
Who's Online
1 registered (Icarus), 177 Guests and 4 Spiders online.
Key: Admin, Global Mod, Mod
Topic Options
Rate This Topic
#195179 - 07/14/10 11:20 PM Hot electrical room
wacked Offline
Member

Registered: 12/19/06
Posts: 33
I was wondering if anybody knows what is the acceptable ambient air temperature for an electrical room. I did a check on a facility that I am an FSR for (that has more heat producing devices...transformers etc after a new addition) Much to my horror the temperature was 45 degrees celcius. Apparently when the construction for this new addition is totally complete there will be remediation concerning this hot electrical room.
The CEC talks about ventilation, but does anybody have a firm number or know where I can find????

Top
2014 / 2011 NEC & Related Books and Study Guides
#195198 - 07/16/10 09:20 AM Re: Hot electrical room [Re: wacked]
jay8 Offline
Member

Registered: 07/28/05
Posts: 183
Loc: Vancouver, BC
that is an interesting problem. Check 6-206 (c) which clearly states 30 degrees. Also 4-004 (8) which calls for conductor derating past 30 degrees. And as you pointed out, 2-318.

Top
#195246 - 07/21/10 03:39 PM Re: Hot electrical room [Re: jay8]
mikesh Offline
Member

Registered: 06/07/06
Posts: 614
Loc: Victoria, BC, Canada
As Jay states 30 degrees. Hotter, and the equipment must be derated.
Wire is derated per table 5A. 45 C is .85

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