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#123506 - 04/04/06 05:05 AM Overheated Fuse
pauluk Offline
Member
Registered: 08/11/01
Posts: 7520
Loc: Norfolk, England
Thanks to Johno12345 for the following:

Quote:
This fuse and holder was removed from one of our oil quench cooling systems which had stopped working. There seem to be 3 things wrong that may have caused the heating. The terminal screw was loose, the fuse screws were both loose and there seems to be some spring contacts misssing from the burnt side. The fact that the load cycles probably accelerated the demise of this. The fuse is still in tact. Incidentally, does anyone know the relevance of the "RED SPOT" on the fuse?






[This message has been edited by pauluk (edited 04-04-2006).]
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#123507 - 04/04/06 06:32 AM Re: Overheated Fuse
Larry Fine Offline
Member
Registered: 02/18/05
Posts: 693
Loc: Richmond, VA
If I'm not mistaken, the red spot blackens when the fuse blows.
_________________________
Larry Fine
Fine Electric Co.
fineelectricco.com
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#123508 - 04/04/06 07:58 AM Re: Overheated Fuse
Lostazhell Offline
Member
Registered: 02/21/04
Posts: 1428
Loc: Bakersfield, CA (Originally Or...
Littlefuse makes fuses (called "The Indicator") with a small window so you can see part of the element inside. If the window is blackened, it usually means a dead short occured vs. an overload.
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#123509 - 04/04/06 08:18 AM Re: Overheated Fuse
Alan Belson Offline
Member
Registered: 03/23/05
Posts: 1803
Loc: Mayenne N. France
Is that a tensile-test piece on the desk? Takes me back a few decades!

Alan
_________________________
Wood work but can't!
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#123510 - 04/04/06 05:33 PM Re: Overheated Fuse
PCBelarge Offline
Member
Registered: 06/08/03
Posts: 681
Loc: Dobbs Ferry, NY, USA
That looks like a lot of strands for such a small conductor size???
If it is not the standard number of strands for the conductor size, it may not be a Class B stranding type, which most likely would not be permitted in this type of installation.
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Pierre Belarge
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#123511 - 04/04/06 06:38 PM Re: Overheated Fuse
classicsat Offline
Member
Registered: 11/23/02
Posts: 456
Curious, what is that PC-board memory module like thingy on the desk, beside the little screw?
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#123512 - 04/04/06 09:39 PM Re: Overheated Fuse
Larry Fine Offline
Member
Registered: 02/18/05
Posts: 693
Loc: Richmond, VA
PCM-CIA board?
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Larry Fine
Fine Electric Co.
fineelectricco.com
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#123513 - 04/05/06 03:46 AM Re: Overheated Fuse
winnie Offline
Member
Registered: 09/15/03
Posts: 649
Loc: boston, ma
That does look like the sort of stranding one sees on welding cable or the conductors in SO cord. What are the issues with using this sort of stranding?

-Jon
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#123514 - 04/05/06 04:27 AM Re: Overheated Fuse
electure Offline


Member
Registered: 12/24/00
Posts: 4259
Loc: Fullerton, CA USA
Are those ribbons wrapped around your shoes?
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#123515 - 04/05/06 04:40 AM Re: Overheated Fuse
Trumpy Offline


Member
Registered: 07/05/02
Posts: 8211
Loc: SI,New Zealand
Red Spot is a brand-name.
That wire looks not unlike welding cable, with that many strands in it.
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Let's face it, these days if you're not young, you're old - Red Green grin
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