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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
... but what would you code a standard class 2 lighting pendent that had no earth connected? there are no exposed conductive parts on the circuit to get a shock from ...
This topic came up this afternoon when my self-building chum and I discussed the apparent futility of terminating the CPC in the otherwise empty terminal in a ceiling rose with a standard pendant fitting (2-way, so not looped at the rose). Leaving aside the requirement in Bs 7671 to provide a CPC, there is always the possibility that the fitting may be replaced by a class 1 one.
In answer to the above, if class 2 fitted and CPC terminated correctly => no code; if class 2 fitted and CPC snipped off => C3 (couldn't be worse because no fault to danger); if class 1 fitted and CPC snipped off => C2.
... but what would you code a standard class 2 lighting pendent that had no earth connected? there are no exposed conductive parts on the circuit to get a shock from ...
This topic came up this afternoon when my self-building chum and I discussed the apparent futility of terminating the CPC in the otherwise empty terminal in a ceiling rose with a standard pendant fitting (2-way, so not looped at the rose). Leaving aside the requirement in Bs 7671 to provide a CPC, there is always the possibility that the fitting may be replaced by a class 1 one.
In answer to the above, if class 2 fitted and CPC terminated correctly => no code; if class 2 fitted and CPC snipped off => C3 (couldn't be worse because no fault to danger); if class 1 fitted and CPC snipped off => C2.
