R

R1CH-G

Just a bit of history first. The following occurred in what is classed as a bunker in the military sense of the word, and all works were carried out to JSP military regs.

Cable used was 2H10 orange sheathed pyro (low smoke zero halides). Cables was potted and glanded and insulation resistance readings taken (500 volts on Fluke 1652) and came back at >500 MegOhms. This cable sat there happily for over 4 months until I got a call saying the DB had gone bang!!

On inspection, the pot was blown to bits! The only thing I can put this down to was dodgy compound and tracking.

Anyone out there who could suggest any alternatives, because for the life of me, I can't work this one out!
 
Only time I've seen this happen the pot had not been completely filled with compound at the time the only reason I could suggest was condensation had formed in the air pocket thus causing a short
 

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Pyro Cable
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Australia
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R1CH-G,
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Knobhead,
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