A customer asked me to check the earthling of his installation after a short on an appliance did not trip anything in the DB. Tests at the socket outlets showed an earth fault. Measuring at the inverter outlet terminals I got a reading of 37 volts between neutral and earth. Is the fault with the inverter
or is it possible that the earthing is not correct, ( he has used a steel fencing post as a earth spike .) Also is it safe for me to do an earth loop test at the DB, not sure if it will have any adverse effects on inverter? Any advice will be appreciated.