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I use black as permanent live, and brown as switched live, to stay consistent with the lighting.
Same with emergency lighting.
Using 3 core:
Brown - switched live
Black - permanent (auxiliary) live
Grey (or blue) - neutral.
Using 2 core:
Brown - switched live
Blue - neutral
that's my preference as well. reason is so that all non-em lighting has brown for switch live as you'd expect.