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Plumber meets Electrician
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#123506 04/04/06 08:05 AM
Joined: Aug 2001
Posts: 7,520
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pauluk Offline OP
Member
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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#123507 04/04/06 09:32 AM
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
#123508 04/04/06 10:58 AM
Joined: Feb 2004
Posts: 1,440
Member
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.

#123509 04/04/06 11:18 AM
Joined: Mar 2005
Posts: 1,803
Member
Is that a tensile-test piece on the desk? Takes me back a few decades!

Alan


Wood work but can't!
#123510 04/04/06 08:33 PM
Joined: Jun 2003
Posts: 681
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Member
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
#123511 04/04/06 09:38 PM
Joined: Nov 2002
Posts: 456
C
Member
Curious, what is that PC-board memory module like thingy on the desk, beside the little screw?

#123512 04/05/06 12:39 AM
Joined: Feb 2005
Posts: 693
L
Member
PCM-CIA board?


Larry Fine
Fine Electric Co.
fineelectricco.com
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#123513 04/05/06 06:46 AM
Joined: Sep 2003
Posts: 650
W
Member
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

#123514 04/05/06 07:27 AM
Joined: Dec 2000
Posts: 4,293
Member
Are those ribbons wrapped around your shoes?

#123515 04/05/06 07:40 AM
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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