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#96527 12/05/05 05:08 PM
Joined: Jan 2004
Posts: 1,507
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Member
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
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#96528 12/05/05 05:10 PM
Joined: Jan 2003
Posts: 4,391
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Moderator
A question I have asked myself more than once.

I hope an answer is presented.


Bob Badger
Construction & Maintenance Electrician
Massachusetts
#96529 12/05/05 05:31 PM
Joined: Jul 2004
Posts: 9,923
Likes: 32
G
Member
The only other reference I see is in 430.52ex2(d) and the necessity of 601a doesn't really make sense.


Greg Fretwell
#96530 12/05/05 06:45 PM
Joined: Jul 2004
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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
#96531 12/05/05 08:24 PM
Joined: Sep 2001
Posts: 806
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Member
AFAIK, the 601A fuse is used when you want to fuse an 800A disconnect at 600A.

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

#96532 12/06/05 03:55 PM
Joined: Jan 2004
Posts: 1,507
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Member
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
#96533 12/06/05 04:22 PM
Joined: Aug 2003
Posts: 1,374
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Moderator
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
#96534 12/06/05 04:49 PM
Joined: Jan 2003
Posts: 4,391
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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
#96535 12/07/05 08:08 PM
Joined: Dec 2003
Posts: 751
E
Member
because they make adapters for the smaller sizes?


Earl
#96536 12/08/05 10:10 AM
Joined: Aug 2003
Posts: 1,374
R
Moderator
???


Ryan Jackson,
Salt Lake City
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