Originally Posted by
JohnJo
Thanks Ali. I think there was some confusion (certainly in my head) reading other posts as some of these power supplies seem to be designed for double insulated only equipment and are a pure isolating (from earth) transformer albeit with +115/-115 balanced output and do not have the centre tapping on the secondary tied to earth and connected to the outlet sockets which is different from yours. Might build one of these myself as all my equipment is double insulated. In this type any type of RCD on the secondary would be pointless.
I don't think there is any need further protective devices (MCB or fuses) on the secondary side as there are the fuses in the 13A plugs supplying the equipment and in the back of the equipment itself and any faults in the transformer secondary winding/wiring would be seen and interrupted by the mains supply fuse on the primary, I think :scratch: