OP
tony.towa
It all depends whether its out on a short circuit or an overload.
If you have come off a final ring circuit, or the appliance is plugged into a final ring circuit the protection will be 32amp at the CU. An overload on the appliance will only need to exceed the capabilities of a 13amp fuse (Maximum of 20amp if slow build up) so the mcb will not trip.
On short circuit it depends on the individual charactersitic of the fuse but generally both the mcb and the fuse will operate as the fuse will normally react fractionally slower than the mcb.
If you have come off a final ring circuit, or the appliance is plugged into a final ring circuit the protection will be 32amp at the CU. An overload on the appliance will only need to exceed the capabilities of a 13amp fuse (Maximum of 20amp if slow build up) so the mcb will not trip.
On short circuit it depends on the individual charactersitic of the fuse but generally both the mcb and the fuse will operate as the fuse will normally react fractionally slower than the mcb.
