You posted a very good table above. Could this not be fettled and honed and go in to Part 6 as it would take out all the ambiguity? You might want to submit it in the next DPC?
As for the test that produces a 220ms for a final circuit on a TT system requiring a 0.2s disconnection time that is for once clear in 643.7.1 as it says, " The effectiveness of the automatic disconnection of the supply by RCDs shall be verified using a suitable test equipment according to BS EN 61557-6 to confirm that the relevant requirements of Chapter 41 are met, taking account of the operating characteristics of the device". So a 220ms time would not meet the requirements of Chapter 41 although it would meet the product standard. The same would apply to RCDs to the older BS 4293 standard.
You posted a very good table above. Could this not be fettled and honed and go in to Part 6 as it would take out all the ambiguity? You might want to submit it in the next DPC?
As for the test that produces a 220ms for a final circuit on a TT system requiring a 0.2s disconnection time that is for once clear in 643.7.1 as it says, " The effectiveness of the automatic disconnection of the supply by RCDs shall be verified using a suitable test equipment according to BS EN 61557-6 to confirm that the relevant requirements of Chapter 41 are met, taking account of the operating characteristics of the device". So a 220ms time would not meet the requirements of Chapter 41 although it would meet the product standard. The same would apply to RCDs to the older BS 4293 standard.
