ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
ShoutChat Box
Recent Posts
Lock-down Thread
by HotLine1 - 03/02/21 02:14 PM
Northern Tool Recalls Powerhorse Generators
by Admin - 02/25/21 09:49 PM
You will never guess
by gfretwell - 02/25/21 07:48 PM
New tool
by SMOKEYBOB - 02/15/21 04:59 PM
New in the Gallery:
Facebook follies, bad wiring
FPE in Germany pt.2
Who's Online Now
0 registered members (), 33 guests, and 18 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
Rate this fused disconnect #206660 07/29/12 05:34 PM
Joined: Apr 2002
Posts: 7,234
HotLine1 Offline OP
Member
With the parallel fuses, what would the amperage rating of this disco be??

[Linked Image]

(larger pics in Photo Area)

Last edited by HotLine1; 07/29/12 05:35 PM.

John
Work Gear for Electricians and the Trades
Re: Rate this fused disconnect [Re: HotLine1] #206662 07/30/12 02:05 AM
Joined: Jul 2004
Posts: 9,569
G
gfretwell Offline
Member
2x the size of the fuse ... nominally. The fuses have to be very closely matched for it to work that way.


Greg Fretwell
Re: Rate this fused disconnect [Re: HotLine1] #206663 07/30/12 02:11 AM
Joined: Jun 2004
Posts: 1,273
T
Tesla Offline
Member
1200A Frame Size...

The chassis to neutral bond is striking as is the apparent lack of any dead front assembly.

The bus separation is consistent with 208Y120 voltages...

The neutral is sized to carry only an unbalanced fraction of the return current; hence its reduced cross section.

Just an eyeball hunch.


Tesla
Re: Rate this fused disconnect [Re: HotLine1] #206670 07/30/12 06:38 PM
Joined: Apr 2002
Posts: 7,234
HotLine1 Offline OP
Member
The building this was the main for was gutted in Feb '03, a little over 2 months from when I took this photo. The line side of this 'main' (buss thru back to xfr vault). 'Vault' was determined to be POCO owned, with pots that had a PCB issue. BTW, it was a FPE disco, and the fuses seem to be 'original equipment.

We had many discussions on the rated capacity of the parallel fuses. This being the only one I have come upon.

Tesla, yes it is 120/208 Y, and I think it dates back to the early 1050s. Occupant was a two story, department store that was the original occupant of the bldg.

The electrical distribution, panels, & majority of the wiring looked like '50s, except the IG panel for the POS equipment.

Alas, it was all gone; I found this pic in my files. Posted it to get some discussion going.


John
Re: Rate this fused disconnect [Re: HotLine1] #206675 07/31/12 02:19 AM
Joined: Mar 2007
Posts: 404
noderaser Offline
Member
That's some pretty advanced technology for 1050... I would have expected an oil distribution system to be par for the time.

Re: Rate this fused disconnect [Re: HotLine1] #206678 07/31/12 08:28 AM
Joined: Apr 2002
Posts: 7,234
HotLine1 Offline OP
Member
OK, ya got me....should be 1950s!! Sorry guys, that is what happens when you don't proof read.


John

Featured:

2020 National Electrical Code
2020 National Electrical
Code (NEC)

* * * * * * *

2020 Master Electrician Exam Preparation Combos
2020 NEC Electrician
Exam Prep Combos:
Master / Journeyman

 

Member Spotlight
Lostazhell
Lostazhell
Bakersfield, CA (Originally Orange Co.)
Posts: 1,437
Joined: February 2004
Show All Member Profiles 
Top Posters(30 Days)
Popular Topics(Views)
275,551 Are you busy
209,467 Re: Forum
196,852 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.7.3