ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Shout Box
Recent Posts
Video door bell causing chime activation of coil
by gfretwell. 12/16/18 09:01 PM
Pull out fuse panel?
by wa2ise. 12/14/18 05:09 PM
Conduit fill Calculations
by gfretwell. 12/08/18 08:39 PM
Swimming Pool question
by HotLine1. 12/05/18 12:37 PM
Tingle off the water spigot
by rmiell. 11/30/18 01:03 PM
New in the Gallery:
What is this for?
Plug terminals
Who's Online Now
0 registered members (), 7 guests, and 9 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
Breaker Rating, Iu vs In #169143
09/27/07 06:07 AM
09/27/07 06:07 AM
S
SteveFehr  Offline OP
Member
Joined: Mar 2005
Posts: 1,213
Chesapeake, VA
I'm used to seeing either Iu or In, or the two identical, but I recently came across a molded case breaker (GE D125) that had an Iu=125A and In=100A, (adjustible from 75-100A). It's not a plug, it's built into the breaker and can't be changed beyond the pot. What, exactly, does this mean? As I understand it, Iu=125A means the contacts are rated for 125A... but with a 100A trip setting, why does that matter in the least? Why would they even bother labeling it? Am I missing something here?

Work Gear for Electricians and the Trades
Re: Breaker Rating, Iu vs In [Re: SteveFehr] #169227
09/29/07 05:36 AM
09/29/07 05:36 AM
Scott35  Offline

Broom Pusher and
Member
Joined: Oct 2000
Posts: 2,713
Anaheim, CA. USA
Could this be a 125 Amp frame, with a 100 Amp trip?

Kind of looks that way from the Spec # (GE D 125), but who knows.

Let me check the GE catalog, then reply later.

Scott


Scott " 35 " Thompson
Just Say NO To Green Eggs And Ham!
Re: Breaker Rating, Iu vs In [Re: Scott35] #169251
09/29/07 09:46 PM
09/29/07 09:46 PM
S
SteveFehr  Offline OP
Member
Joined: Mar 2005
Posts: 1,213
Chesapeake, VA
That's my working assumption, too, Scott. I hate guessing about things like this, though.


Featured:

2017 Master Electrician Exam Preparation Combos
2017 NEC Electrician
Exam Prep Combos:
Master / Journeyman

 

Member Spotlight
HCE727
HCE727
Delaware County, PA, USA
Posts: 186
Joined: November 2005
Show All Member Profiles 
Top Posters(30 Days)
Popular Topics(Views)
252,252 Are you busy
189,209 Re: Forum
178,892 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.6.1
(Release build 20180101)
Page Time: 0.015s Queries: 15 (0.003s) Memory: 0.9514 MB (Peak: 1.0773 MB) Zlib enabled. Server Time: 2018-12-17 09:47:20 UTC