agencies ?
It's indirectly because of the resistance - at a certain current level,
the I^2R will heat up the solder, which _could_ melt and leave
you with an open ground, which depending on the fault, could make
the equipment dangerous to touch.
Cheers!
Rich
It is also easier to visually determine the quality of the ground
connection where a mechanical type solid connection eg. stud/screw,
shakeproof washer and nut, is used. A soldered joint is harder to
perform properly and the quality of connection is not easily
determined by visual inspection. For safety ground connections in
particular, I think you will find that a mechanical connection is
specified as the standard by most safety authorities.
I have seen quick connect (QC) tabs and push-on terminals used for the
safety ground connection on domestic appliances such as fridges, but I
am not sure if they are acceptable unless the cable end connector is a
locking type which cannot dislodge due to vibration or other accident.