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Carried out an eicr and noticed x2 double sockets have reverse polarity that supply a frying machine at high level. (this was a return visit to correct the faults)
After correcting the reverse polarity on the two sockets i plugged the fryer back in and the circuit MCB tripped out and the appliance popped.

I am unable to open the fryer up as its fixed into the unit.

I cant seem to work out why the original appliances required the sockets to have incorrect polarity at the socket, and after correcting the reverse polarity the appliance tripped the fuse.

I checked the newly configured polarity and the sockets were correctly wired wheres before the L-N had been reversed.
 

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