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Joined: Aug 2001
Posts: 7,520
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Thanks to Johno12345 for the following: 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]](https://www.electrical-contractor.net/PC/HPIM1296.JPG) ![[Linked Image]](https://www.electrical-contractor.net/PC/HPIM1294.JPG) [This message has been edited by pauluk (edited 04-04-2006).]
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Joined: Feb 2005
Posts: 693
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If I'm not mistaken, the red spot blackens when the fuse blows.
Larry Fine
Fine Electric Co.
fineelectricco.com
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Joined: Feb 2004
Posts: 1,440
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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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Joined: Mar 2005
Posts: 1,803
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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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Joined: Jun 2003
Posts: 681
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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
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Joined: Nov 2002
Posts: 456
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Curious, what is that PC-board memory module like thingy on the desk, beside the little screw?
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Joined: Feb 2005
Posts: 693
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Larry Fine
Fine Electric Co.
fineelectricco.com
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Joined: Sep 2003
Posts: 650
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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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Joined: Dec 2000
Posts: 4,293
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Are those ribbons wrapped around your shoes?
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Joined: Jul 2002
Posts: 8,441 Likes: 4
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Red Spot is a brand-name.
That wire looks not unlike welding cable, with that many strands in it.
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Posts: 5,476
Joined: January 2005
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