Previous in Forum: Configuration of Lightning Arrestor With Fuse Drop Out in a Distribution Transformer   Next in Forum: When to Go for Neutral Grounding Through Resistance
Close

Comments Format:






Change Mode
Close

Subscribe to Discussion:

CR4 allows you to "subscribe" to a discussion
so that you can be notified of new comments to
the discussion via email.

Close

Rating Vote:







Add Vote
4 comments
Rate Comments: Nested
samsam_sam45
Associate

Join Date: May 2011
Posts: 38

Cable Derating Factors

02/14/2013 4:51 AM

dear friends, I want to lay 9 duty cable (multi core) on cable tray , the cable tray is perforated unarmoured cable XLPE insulated PVC sheated what could be the arrangement or what will be the derating factor as per NEC codes .please give me the reference. thanks sam.
Register to Reply
Interested in this topic? By joining CR4 you can "subscribe" to
this discussion and receive notification when new comments are added.
7anoter4
Guru

Join Date: Oct 2012
Location: 100 miles North from the World Center
Posts: 879
Good Answers: 42
#1

Re: cable derating factors

02/14/2013 6:51 AM

See NEC 392.17 Ampacity of Conductors

__________________
 Julius
Register to Reply
samsam_sam45
Associate

Join Date: May 2011
Posts: 38
#3
In reply to #1

Re: cable derating factors

02/14/2013 5:41 PM

Dear 7anote4, to ur reply NEC 392.17 still it is not clear to me as per.my information can u please.help me.to the posted.comment for derating factor thanks sam
Register to Reply
nobodysomebody47
Power-User

Join Date: Nov 2011
Posts: 171
Good Answers: 1
#2

Re: Cable Derating Factors

02/14/2013 10:35 AM

check this

Cable Derating Factors
Register to Reply
7anoter4
Guru

Join Date: Oct 2012
Location: 100 miles North from the World Center
Posts: 879
Good Answers: 42
#4

Re: Cable Derating Factors

02/15/2013 2:45 AM

It is not sufficient data in order to state the ampacity. You have to choose how you will install the cables according art. 392.22.For instance ,let's say the cable tray is dedicated only for these 9 cables: 3*C [rated 2000 V or less] XLPE insulated PVC sheathed cables, and sum of diameters of all cables will not exceed cable tray width [392.22(A)] then you can follow the 310.15(B)16 Table for 90 dgr.C [copper column 3 or aluminum column 6].

__________________
 Julius
Register to Reply
Register to Reply
Have a Different Question?
4 comments
Copy to Clipboard

Users who posted comments:

7anoter4 (2); nobodysomebody47 (1); samsam_sam45 (1)

Previous in Forum: Configuration of Lightning Arrestor With Fuse Drop Out in a Distribution Transformer   Next in Forum: When to Go for Neutral Grounding Through Resistance

Advertisement

Got Something to Say?
Ask a Question
Start a Discussion

Search this Forum
Electrical Engineering:
Go

CR4 Sections
Aerospace
BioMech & BioMed
Chemical & Material Science
Civil Engineering
Communications & Electronics
Education and Engineering Careers
Electrical Engineering
General Discussion
Instrumentation
Manufacturing
Mechanical Engineering
New Technologies & Research
Software & Programming
Sustainable Engineering
Transportation

Site Directories
Forum Directory
Blog Directory
User Group Directory
RSS Feeds

CR4 Rules of Conduct
CR4 FAQ
Site Glossary

Who's Online (148 right now)
Show Members
Advertisement