The Inspector's Journal Forums
Username:
Password:
Save Password


Join TIJ Forums
Lost Password?
Subscribe to TIJ's Newsletter

All Forums > Technical Forums > Attics & Insulation >

Sprayed Foam Attic #2

Previous Topic: accepted application? - Topic - Next Topic: Sprayed Foam Attic #3 New TopicReply to TopicShare Topic
Posted By  
Peoria, Arizona
Posts: 136
Joined: Feb, 2004
Currently offline offline
  
Thread Start First Page
[#1] Posted: 01/28/2012 - 6:55:35 PM
Reply with Quote
In the garage area of this attic, the electrical cables got coated with sprayed polyurethane foam. It is not uncommon for attic temperatures here to reach over 140 degrees in the summer time. Is it safe to assume that all these cables should now be derated or how would you go about fixing the problem?

Thanks,

Jeff Euriech
Peoria Arizona


Download Attachment: 1A SF 6.JPG
447.49 KB

Download Attachment: 1A SF 7.JPG
515.17 KB

View Profile
Gaston, Oregon
Posts: 8790
Joined: Dec, 2003
Currently offline offline
  
Sprayed Foam Attic #2
[#2] Posted: 01/29/2012 - 1:14:03 PM
Reply with Quote
How would this be any different from any other garage attic in your area?

Those are modern romex cables with 90-degree conductors inside, and it's unlikely that the amibient temperature down low in the attic in that picture gets much above 140 degrees. So to apply that derating, you'd take 71% of the 90-degree ampacity for those wires. That would yield an ampacity that's still well above the orginal ampacity for the romex cable assemblies.

So derating for temperature, in this case, wouldn't have any effect on the installation.

Jim Katen, Oregon
www.amipdx.com
   
Previous Topic: accepted application? - Topic - Next Topic: Sprayed Foam Attic #3 New TopicReply to TopicShare Topic
Jump To:
The Inspector's Journal Forums © 2002-2013 all topics or replies that are posted on The Inspector's Journal
are copyrighted material of the original author that posted the topic or reply.
Go To Top Of Page 
 
Pick an RSS Feed

The views expressed on this website are the views of the authors and
do not necessarily reflect the views or policies of the sponsors.
© 2002-2013 Copyright DevWave Software Inc.
Find a Home Inspector

Powered By: Snitz Forums 2000