The screw torque is specified in several standards, but the acceptance
criterion is usually the high-current resistance test. It's really up to
the manufacturer of the product to specify the requirements of the
washer, which must be double-sided so that it doesn't matter which way
up it is installed.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2018-08-08 14:21, Scott Xe wrote:
Notice that it is common to use external toothed star washer to
cut through the paint on metal enclosure instead of removing the paint
for earthing. The connection effectiveness may be affected with
following things
* Sharpness of teeth on washer (some toothed washers are single
sided instead of 2-sided)
* Material of washer
* Paint thickness
* Screw torque
Is there any standard to give the guidance of minimum requirement for
this purpose?
Thanks and regards,
Scott
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