I am looking for an adapter to enable connection of 4mm shrouded plugs to a BS socket so a multimeter can safely be plugged into a socket and if the adapter is left it would not represent a hazard to a user of the installation due to it's IP rating. A 13A BS plug with 4mm sockets suitable for shrouded plugs will do. Does any test equipment manufacturer make such an adaptor.
Also looking for BS plug with P connected (v. low Z) to E, but with a
*resettable* circuit breaker incorporated. This is for measurement of R1 plus R2 during faultfinding. The circuit breaker on plug required in case the unit is left plugged in by mistake and the circuit is energised. The circuit breaker for the final circuit will not necessarily trip before the supply company fuse on some of the installations worked on.