This doesn't look too good

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Redpacket

Member
Joined
Feb 28, 2018
Messages
1,302
Just a touch of a heat problem here:


image_qryfrc.jpg



Maybe a reminder of why we like more copper, good crimps& spring washers!
 
Joined
Mar 7, 2018
Messages
1,054
I had a bunch of nuts from a supplier which had been threaded at an angle so the nut did not sit flat to the surface, looks like something like this as the hot spot is one side of the nut. Also looks like the lug is on an insulator or high resistance and the washer / nut is then carrying the current back to the bar via the bolt... ??? Otherwise (appart from photoshop) there is no way the nut would get that hot above the lug without the lug glowing ?
 

not2bme

Member
Joined
Oct 16, 2017
Messages
493
So what's the story there??? it can't be just the stainless bolts, because as long as the lugs and the busbar is copper it's fine. Loose bolts?
 

Korishan

Moderator
Joined
Jan 7, 2017
Messages
6,549
It's a dead short somewhere. The connection above the bolt you can see it's been burned severely.

This photo has been around before. If I'm not mistaken, the battery bank that this was on is Lead Acid.
 

Sean

Member
Joined
Oct 8, 2016
Messages
936
not2bme said:
So what's the story there??? it can't be just the stainless bolts, because as long as the lugs and the busbar is copper it's fine. Loose bolts?

Contaminated contact faces between the crimp and bar, so the fixing is taking the current - SS isn't a great conductor.


Korishan said:
It's a dead short somewhere. The connection above the bolt you can see it's been burned severely.

This photo has been around before. If I'm not mistaken, the battery bank that this was on is Lead Acid.

There's no dead short, just a high current load. The insulation is damaged due to heat being conducted from the area of poor connectivity through the crimp and wire conductors.
 
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