I’m putting together some junction boxes for domestic lighting using RS own brand DIN terminals in a suitable enclosure (home automation later would favour grouping the wiring into a limited number of JBs with space to accept relays later).
One thing that came to mind was to do with these:
They are the special DIN terminals that have a screw operated clamp to the DIN rail which claims to provide electrical continuity.
How might I decide if these would provide suitable and reliable continuity for the circuit CPC on say a circuit protected by a C10 RCBO? Or do you reckon they are just fine?
Points I’ve considered:
Reliability – these clamp to a plated steel rail – so providing the plating holds and the rail does not corrode, then OK Clamping action seems positive.
Contact resistance: haven’t attempted to measure yet, but I suspect it would be off the bottom of the range of my Megger.
Fault current – worst case scenario: hundreds of amps but no more than 1kA for a very short time.
There is a little leeway in that the circuit is RCD protected, but I feel it would be bad practice to factor that in as a key design consideration.
What do you folk think of such devices?