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A smear of Vaseline?

AncientMariner

Opened up a 32A rotary isolator (IP65) mounted on an outside wall and found traces of condensation within and corroded terminals/cable ends; not helped by the use of steel screws and I suspect the cage. 

I will be replacing the isolator, but how to prevent or lessen corrosion?

A good smear of Vaseline before tightening the terminals comes to mind, but is that a good idea?  I guess Vaseline is an insulator (Google seems to suggest it is and it isn't), but when used during the connection of a car starter battery, any reduction in surface contact must be minimal since I have never seen signs of overheating.

If not Vaseline, how about Copperslip?

Clive

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  • 0

    If you really want to go to town Clive a little Calcium based underwater grease will probably prevent corrosion forever. I expect you have a tin of stern tube lubricant somewhere? It has the advantage of being difficult to burn too Mike. It is often suggested that silicones are a bad idea on electrics, but I have at last discovered that some high temperature silicone oil actually fixes EGR valves on my Vauxhall engine (actually Isuzu) for a useful period, where petroleum based ones burn off very quickly!

  • 0 in reply to David Stone

    Technical_Data_Sheet_Multi_Purpose_Grease.pdf (super-lube.com)

    Z.

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