IP washers and earth continuity

[Jk1996]

What is your thoughts on providing metal to metal earth continuity when fibre washers are used between a metallic gland and metal enclosure?

 

[MacGyverS2000]

If you need connectivity, why are fiber washers being used? (full disclosure, perhaps there's a code compliancy issue you're trying to resolve with the washer I'm unaware of).

EDIT: Missed the IP part in the original question... my bad.

Dan - Owner

http://www.Hi-TecDesigns.com

 

[zappedagain]

If the fiber washers are there for IP protection to keep fluids out, then you probably need a conductive gasket around the washer to make the electrical contact, or a counterbore ring for the washer so you can compress the washer adequately for IP protection, and then compress it a little more to make metal to metal contact. It can be done with the right materials and proper engineering.

 

[Jk1996]

I have seen it where the gland has a fibre washer between the gland and enclosure and inside the enclosure a earth ring is fitted then a lock nut but wasn’t sure what the general consensus was on good engineering practice?

 

[IRstuff]

It's pretty straightforward, though, isn't it? If it needs to be grounded, one runs a ground strap to it, irrespective of of the intent of the washer

TTFN (ta ta for now)
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[zappedagain]

Earth rings are good for low frequency connections (bonding), but fairly worthless if you need the connection for an RF shield.

Z