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Zs readings over limits
Former Community Member
Doing an EICR in a block of flats and quite a few of the lighting circuits have excessive Zs readings. All the circuits are on 60898 C10's without RCD protection with readings in the late 2 early 3 ohm range (max permitted 2.19). I know test result fails are generally a code 2 but these are LED panel downlighters with mostly class 2 drivers connected via choc boxes above the suspended ceiling so nothing really accessible. They would all comply with a C6 btw. Just wondered if you'd C2 this resulting in an unsatisfactory EICR
Andy, thats along the line I was thinking. Do remember if that fault was realised we would still get disconnection, just not in 0.4 seconds, as the thermal part of the MCB could come into play. Same with P/N impedance mentioned by Alan earlier, I dont think that applies as again we are in overload territory. As I see it exposed live conductive parts = 0.4s anything else = protect the cable.
I will code it C2 btw but cant help thinking its pretty safe as it is.
Andy, thats along the line I was thinking. Do remember if that fault was realised we would still get disconnection, just not in 0.4 seconds, as the thermal part of the MCB could come into play. Same with P/N impedance mentioned by Alan earlier, I dont think that applies as again we are in overload territory. As I see it exposed live conductive parts = 0.4s anything else = protect the cable.
I will code it C2 btw but cant help thinking its pretty safe as it is.
