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IP washers and earth continuity

thread240-484224

IP washers and earth continuity

IP washers and earth continuity

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

RE: IP washers and earth continuity

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

RE: IP washers and earth continuity

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.

RE: IP washers and earth continuity

(OP)
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?

RE: IP washers and earth continuity

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

Z

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