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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
At 3ohms you are likely to get around 70 to 80A and push disconnection to around 6 to 7 seconds. Providing I2t is ok then the risk is minimal for what you describe.
At 3ohms you are likely to get around 70 to 80A and push disconnection to around 6 to 7 seconds. Providing I2t is ok then the risk is minimal for what you describe.
