having a "debate" with engineers ,consultants+electrician . its a new factory installation incorporating lots of motors,conveyors,plcs etc. they want me to inspect and issue the coc.the engineer designed the system where the 230 volt contactors/relays have most of the switching on the live side of the relay,but the limit switches are all switching the neutral side.
i failed it. they reckon its safer as you only get a tickle instead of the full 230 volts as the coil of the relay will drop the voltage. i say if the cable is damaged to earth then the limit switch is bypassed and the relay is energised(from the 1 side anyway)