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Hi recently was on a job carrying out EX inspections on three phase motor at a pharmaceutical plant. The supply cable going to the motors does not have a core for the earth they have used the braid/SWA of the cable for earthing. So entering the three phase motor with EXe cable glands terminating the earth Via the gland into a threaded entry into 3 phase motor. Now my question/debate I was having with work colleague was yeah it is entering a threaded entry into enclosure where you will get your earth but the motor terminal box is bolted to the frame of the motor through the 4 fixings bolts, is this adequate to carry the earth through to the motor frame or should it really have banjos then separate earth down to the frame. There is a supplementary earth going from the frame to a local earth boss ? Thanks in advance
 
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