Brass bolts? Avoiding bi-metal corrosion on SWA glands

[jakesmith]

There’s a junction box outside that has SWA glands

There is severe corrosion where the non-brass crimp contacts the earthing nut inside the box, and the supplied screw in the earthing nut is also badly corroded.

so I’m planning on replacing them, how do I avoid this corrosion? Surely it’s caused by 2 different metals in contact. Are there brass crimps?

It looks like everything was installed as per the kit. Confused.

Edited by jakesmith on Thursday 26th May 23:52

[jakesmith]

smifffymoto said:

I would sack that off and get a gland kit with the ring type earth,the type that is between the gland and your adaptable box.

Might sound like a stupid question but I have those too and same issue - the nut and bolt I used to connect the ring to the crimp has badly corroded. What type of nut and bolt should I use? Think I used stainless steel as I had some on hand that fitted, guessing that’s the issue.

[jakesmith]

smifffymoto said:

I would sack that off and get a gland kit with the ring type earth,the type that is between the gland and your adaptable box.

Might sound like a stupid question but I have those too and same issue - the nut and bolt I used to connect the ring to the crimp has badly corroded. What type of nut and bolt should I use? Think I used stainless steel as I had some on hand that fitted, guessing that’s the issue.

[jakesmith]

Thanks all, seems my issue is inadvertently using internal gland kits, using stainless bolts.
The junction box has the correct IP rating
I will replace following the suggestions above