The purpose of regulation 560.10 is to make you aware that you install a fire detection system to the correct British standard , in this case BS5839 part 6, not to use it as a regulation number for out of date smoke detectors
The plug has a 13 amp fuse in it so that’s not technically accurate, more like the instructions cater for the European 16amp socket arrangement where there is no fuse inside a plug.
20 amp DP switches are used on the grid for isolation/maintenance purposes only, nothing to do with having only 20 amps max through the switch or whatever as installing a fuse or a fused connection unit would be pointless considering the appliance plug has a fuse inside it.
The arrangement is acceptable as long as the conductors are adequately protected for fault protection, overload current can be omitted and in any case is afforded by the nature of the final load and fused spur
There is no regulation that specifies fire rated downlights, more a building regulation.
There’s a requirement to to seal wiring systems passing through elements of the building to restore if any the fire resistance (like a fire compartment) prescribed by the element of that particular building...
Earth it or bond it?
Bonding something because your not sure is no reason to bond anything.
It’s an exposed conductive part so earth it it , if it’s not then don’t, it’s extraneous then bond it, it’s not extraneous then don’t.
lumping a quite possibly large protective bonding conductor on to...
Did you actually measure the Ze (zdb as written on the minor works form) at the CU as required on the minor works certificate or assume the sharpie scrawled 0.32 ohms?
Depending on where the TX is , I don’t think 0.32 for a TNS is high.
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