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#96527 - 12/05/05 01:08 PM 801a. Fuse
George Little Offline
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Registered: 01/18/04
Posts: 1488
Loc: 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).]
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George Little
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#96528 - 12/05/05 01:10 PM Re: 801a. Fuse
iwire Offline
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Registered: 01/05/03
Posts: 4391
Loc: North Attleboro, MA USA
A question I have asked myself more than once.

I hope an answer is presented.
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#96529 - 12/05/05 01:31 PM Re: 801a. Fuse
gfretwell Offline


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Registered: 07/20/04
Posts: 9039
Loc: Estero,Fl,usa
The only other reference I see is in 430.52ex2(d) and the necessity of 601a doesn't really make sense.
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#96530 - 12/05/05 02:45 PM Re: 801a. Fuse
gfretwell Offline


Member
Registered: 07/20/04
Posts: 9039
Loc: 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
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#96531 - 12/05/05 04:24 PM Re: 801a. Fuse
NJwirenut Offline
Member
Registered: 09/15/01
Posts: 806
Loc: 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.
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#96532 - 12/06/05 11:55 AM Re: 801a. Fuse
George Little Offline
Member
Registered: 01/18/04
Posts: 1488
Loc: 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.
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#96533 - 12/06/05 12:22 PM Re: 801a. Fuse
Ryan_J Offline
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Registered: 08/19/03
Posts: 1374
Loc: 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.
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#96534 - 12/06/05 12:49 PM Re: 801a. Fuse
iwire Offline
Moderator
Registered: 01/05/03
Posts: 4391
Loc: 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?
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Bob Badger
Construction & Maintenance Electrician
Massachusetts
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#96535 - 12/07/05 04:08 PM Re: 801a. Fuse
earlydean Offline
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Registered: 12/22/03
Posts: 751
Loc: Griswold, CT, USA
because they make adapters for the smaller sizes?
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Earl
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#96536 - 12/08/05 06:10 AM Re: 801a. Fuse
Ryan_J Offline
Moderator
Registered: 08/19/03
Posts: 1374
Loc: West Jordan, Utah, USA
???
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Salt Lake City
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