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Overheated Fuse #123506
04/04/06 07:05 AM
04/04/06 07:05 AM
P
pauluk  Offline OP
Member
Joined: Aug 2001
Posts: 7,520
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?


[Linked Image]
[Linked Image]


[This message has been edited by pauluk (edited 04-04-2006).]

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Re: Overheated Fuse #123507
04/04/06 08:32 AM
04/04/06 08:32 AM
L
Larry Fine  Offline
Member
Joined: Feb 2005
Posts: 693
Richmond, VA
If I'm not mistaken, the red spot blackens when the fuse blows.


Larry Fine
Fine Electric Co.
fineelectricco.com
Re: Overheated Fuse #123508
04/04/06 09:58 AM
04/04/06 09:58 AM
Lostazhell  Offline
Member
Joined: Feb 2004
Posts: 1,431
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.

Re: Overheated Fuse #123509
04/04/06 10:18 AM
04/04/06 10:18 AM
Alan Belson  Offline
Member
Joined: Mar 2005
Posts: 1,803
Mayenne N. France
Is that a tensile-test piece on the desk? Takes me back a few decades!

Alan


Wood work but can't!
Re: Overheated Fuse #123510
04/04/06 07:33 PM
04/04/06 07:33 PM
P
PCBelarge  Offline
Member
Joined: Jun 2003
Posts: 681
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.


Pierre Belarge
Re: Overheated Fuse #123511
04/04/06 08:38 PM
04/04/06 08:38 PM
C
classicsat  Offline
Member
Joined: Nov 2002
Posts: 456
Curious, what is that PC-board memory module like thingy on the desk, beside the little screw?

Re: Overheated Fuse #123512
04/04/06 11:39 PM
04/04/06 11:39 PM
L
Larry Fine  Offline
Member
Joined: Feb 2005
Posts: 693
Richmond, VA
PCM-CIA board?


Larry Fine
Fine Electric Co.
fineelectricco.com
Re: Overheated Fuse #123513
04/05/06 05:46 AM
04/05/06 05:46 AM
W
winnie  Offline
Member
Joined: Sep 2003
Posts: 649
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

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

Member
Joined: Dec 2000
Posts: 4,275
Fullerton, CA USA
Are those ribbons wrapped around your shoes?

Re: Overheated Fuse #123515
04/05/06 06:40 AM
04/05/06 06:40 AM
Trumpy  Offline

Member
Joined: Jul 2002
Posts: 8,250
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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