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801a. Fuse #96527
12/05/05 05:08 PM
12/05/05 05:08 PM
G
George Little  Offline OP
Member
Joined: Jan 2004
Posts: 1,489
Michigan USA
What good is an 601a. fuse?

Meant to 601a in the Subject line :0

[This message has been edited by George Little (edited 12-05-2005).]


George Little
2017 / 2014 NEC & Related Books and Study Guides
Re: 801a. Fuse #96528
12/05/05 05:10 PM
12/05/05 05:10 PM
I
iwire  Offline
Moderator
Joined: Jan 2003
Posts: 4,391
North Attleboro, MA USA
A question I have asked myself more than once.

I hope an answer is presented.


Bob Badger
Construction & Maintenance Electrician
Massachusetts
Re: 801a. Fuse #96529
12/05/05 05:31 PM
12/05/05 05:31 PM
G
gfretwell  Offline

Member
Joined: Jul 2004
Posts: 9,242
Estero,Fl,usa
The only other reference I see is in 430.52ex2(d) and the necessity of 601a doesn't really make sense.


Greg Fretwell
Re: 801a. Fuse #96530
12/05/05 06:45 PM
12/05/05 06:45 PM
G
gfretwell  Offline

Member
Joined: Jul 2004
Posts: 9,242
Estero,Fl,usa
Are they really saying I could use a 601a time delay Type L fuse at up to 300% of FLA vs 175% for 600a or less? (when the rest of 430.52 Ex1 & Ex2 is met)

I don't know and I have never seen a 125 HP motor


Greg Fretwell
Re: 801a. Fuse #96531
12/05/05 08:24 PM
12/05/05 08:24 PM
N
NJwirenut  Offline
Member
Joined: Sep 2001
Posts: 806
Bergen County, NJ
AFAIK, the 601A fuse is used when you want to fuse an 800A disconnect at 600A.

Essentially, a 600A fuse in the 800A package.

Re: 801a. Fuse #96532
12/06/05 03:55 PM
12/06/05 03:55 PM
G
George Little  Offline OP
Member
Joined: Jan 2004
Posts: 1,489
Michigan USA
We have an IAEI Seminar 12/8 & 9 and the Bussman rep is scheduled to be there. I'll bounce it off him and bring back the info.


George Little
Re: 801a. Fuse #96533
12/06/05 04:22 PM
12/06/05 04:22 PM
R
Ryan_J  Offline
Moderator
Joined: Aug 2003
Posts: 1,374
West Jordan, Utah, USA
I have been told that the after 600 amps, the physical size of fuses changes. If you have equipment that willonly accept fuses greater tahn 600 amps, but you want 600 amp protection, you use a 601 amp fuse.


Ryan Jackson,
Salt Lake City
Re: 801a. Fuse #96534
12/06/05 04:49 PM
12/06/05 04:49 PM
I
iwire  Offline
Moderator
Joined: Jan 2003
Posts: 4,391
North Attleboro, MA USA
Ryan that makes sense but why do we not have 101, 201, 401, 801 amp fuses as well for the same reason?


Bob Badger
Construction & Maintenance Electrician
Massachusetts
Re: 801a. Fuse #96535
12/07/05 08:08 PM
12/07/05 08:08 PM
E
earlydean  Offline
Member
Joined: Dec 2003
Posts: 751
Griswold, CT, USA
because they make adapters for the smaller sizes?


Earl
Re: 801a. Fuse #96536
12/08/05 10:10 AM
12/08/05 10:10 AM
R
Ryan_J  Offline
Moderator
Joined: Aug 2003
Posts: 1,374
West Jordan, Utah, USA
???


Ryan Jackson,
Salt Lake City
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