We are constantly debating both the best method, and trying to identify
any NEBS or ETSI type standard requirements for bonding the chassis of DC power
equipment to the mounting rack.
The debate is simply between a bonding wire held with a screw holding a
ring terminal and penetrating lock washer (could be integral to the ring
terminal) or the same arrangement but with a pressed in stud and a nut holding
the ring terminal to the chassis.
I prefer the nut/stud combination as I can apply more pressure to the
connection and have less concerns about over tightening the assembly and
stripping threads etc, and unless they mask around the screw hole prior to the
application of the powder coat, it really takes a good star washer to cut
through the coating.
The mechanical guy always likes the screw, because a tapped whole is
cheaper than a pressed stud, and it doesn't extend from the chassis like some
kind of unwanted wart.
The US standard I work with for this type of equipment is the NEB -
GR-1089, and it identifies Thread forming screws that remove paint and
non-conductive coatings. Given that most, of the equipment I run across uses
the stud/nut combinations.
Any body have any comparative data between the two to share. Does ETSI
have anything different to say about the bonding mechanism?
Thanks
Gary
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