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Got a bit of an odd one here. Have a customer with a water pump which is plugged into a socket with a 13A plug. It is controlled by a float switch and pressure switch which operate a contactor which brings on the pump.
Pump is 2.2kW 10A FLC
He phoned to say it was blowing fuses every so often (perhaps one every 2 days)
He has changed the plug with a new one. All OK inside that.
I get there check the motor - all OK there nothing down to earth and windings seemingly ok. The only thing was the line and neutral in the terminal box had got hot and blackened so re-terminated these.
I also fitted a 10A motor overload as there wasn't one previously.
Replaced fuse 13A and all OK, drawing between 8-9A.
Customer phoned this morning to say the pump had stopped again, but the fuse had blown, and the overload stayed ON.
Why would this happen? Surely a motor overload set to 10A is going to operate before a 13A fuse (unless a dead short appeared perhaps) but I can't see that has happened. He replaced the fuse again and its all running again.
Ideas what to look at? Thanks.
Pump is 2.2kW 10A FLC
He phoned to say it was blowing fuses every so often (perhaps one every 2 days)
He has changed the plug with a new one. All OK inside that.
I get there check the motor - all OK there nothing down to earth and windings seemingly ok. The only thing was the line and neutral in the terminal box had got hot and blackened so re-terminated these.
I also fitted a 10A motor overload as there wasn't one previously.
Replaced fuse 13A and all OK, drawing between 8-9A.
Customer phoned this morning to say the pump had stopped again, but the fuse had blown, and the overload stayed ON.
Why would this happen? Surely a motor overload set to 10A is going to operate before a 13A fuse (unless a dead short appeared perhaps) but I can't see that has happened. He replaced the fuse again and its all running again.
Ideas what to look at? Thanks.