ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals

ECN Shout Chat
Top Posters(30 Days)
Admin 19
Recent Posts
Anyone hiring inspectors?
by HotLine1. 03/27/17 08:03 AM
Old decora style outlets
by Admin. 03/25/17 11:40 AM
ESA Arc flash course
by TheShockDoctors. 03/24/17 10:15 AM
fuse rejectors
by HotLine1. 03/24/17 07:53 AM
Another Forum Update
by Admin. 03/22/17 03:04 PM
New in the Gallery:
SE cable question
Popular Topics(Views)
231,643 Are you busy
166,537 Re: Forum
160,725 Need opinion
Who's Online Now
0 registered members (), 62 guests, and 10 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate This Thread
#180123 - 08/13/08 10:45 PM Sizing for heatstrips  
schenimann  Offline
Member
Joined: Feb 2008
Posts: 193
Western North Carolina
I'm pricing out a job for a local plant. They had a gas heater go out and they are wanting to replace it with an electric heater to seee if there are any savings.

They are installing three sets of two 25kw heaters(480v). This is 60.1 amps per set. This is for 1 machine with the pontential of adding 5 more.

I'm feeding them from a busbar to a breaker panel to the heaters. I'm going to size my wire according to this number #6THHN.

Do I need to size my wire feeding the breakers at 180 amps or can I derate?

If I add another machine am I then up to 360 amps? Or five machines and 1080amps?

Thanks for your expertise.


Work Gear for Electricians and the Trades

#180124 - 08/14/08 12:23 AM Re: Sizing for heatstrips [Re: schenimann]  
gfretwell  Offline


Member
Joined: Jul 2004
Posts: 9,059
Estero,Fl,usa
I don't see any reason why you could use anything less than 100% of connected load and if this is continuous load it would be 125%.


Greg Fretwell

#180129 - 08/14/08 06:21 AM Re: Sizing for heatstrips [Re: gfretwell]  
schenimann  Offline
Member
Joined: Feb 2008
Posts: 193
Western North Carolina
Thanks Greg, I was going the wrong way with my size.



Member Spotlight
The_Lightman
The_Lightman
Orlando, Fl, USA
Posts: 49
Joined: August 2001
Show All Member Profiles 
Featured:

2017 NEC and Related
2017 NEC
Now Available!

Shout Box
Powered by UBB.threads™ PHP Forum Software 7.6.0
Page Time: 0.010s Queries: 15 (0.003s) Memory: 0.7496 MB (Peak: 0.8742 MB) Zlib enabled. Server Time: 2017-03-28 13:59:59 UTC