It is currently Wed Jul 08, 2020 7:05 am



Post new topic Reply to topic
Author Message
ekstra   ara
 Post subject: Cable and Raceway Properties and SC Studies
PostPosted: Mon Jul 15, 2019 4:53 am 

Joined: Thu Jun 09, 2016 6:17 pm
Posts: 6
Hello Everyone,

I am curious how everyone is handling cable properties (insulation/jacket types) that may not be typical within software platforms? Are you requesting actual impedance data from manufacturers? Additionally, how are you handling conductor runs that may change raceway materials? For example, a particular run changes from steel conduit to aluminum cable tray and possibly back to conduit? Are you demonstrating this as separate cables?

Thanks for the input.


Top
 Profile Send private message  
Reply with quote  
 Post subject: Re: Cable and Raceway Properties and SC Studies
PostPosted: Mon Jul 15, 2019 6:51 am 
Sparks Level

Joined: Wed Jan 28, 2009 2:19 pm
Posts: 72
Location: Georgia
As to your second question regarding conductor runs that change raceway material...I model them as separate cables.


Top
 Profile Send private message  
Reply with quote  
 Post subject: Re: Cable and Raceway Properties and SC Studies
PostPosted: Mon Jul 22, 2019 8:45 am 
Sparks Level
User avatar

Joined: Tue Oct 26, 2010 5:00 pm
Posts: 187
Location: Maple Valley, WA.
We would add a bus for the locations where the conduit transitions to another type. Conduit type (magnetic/non-magnetic) will have a slight affect on short circuit calculations. If these are short runs (less than 10 feet), I would not worry about it too much.

Insulation type has very little affect on the short circuit calculation. Conductor type (copper/aluminum), size, and length is what really impacts the SC calculations.

_________________
Robert Fuhr, P.E.; P.Eng.
PowerStudies


Top
 Profile Send private message  
Reply with quote  
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 3 posts ] 

All times are UTC - 7 hours


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Jump to:  
© 2019 Arcflash Forum / Brainfiller, Inc. | P.O. Box 12024 | Scottsdale, AZ 85267 USA | 800-874-8883