Can someone confirm, whether this diagram is ok for wiring up a maintained emergency light switch please. It took me a while to figure out what was what. View attachment 9248
No. Just switch L1 and L2 separately. No need for the test switch to isolate everything. Your Three Core + E colours don't make sense ;-)
Forgot to change the colours. This is the latest drawing. HARMONISED COLOURS I understand that it would still work without the key switch, but just wanted one as the switch is at the top stairs of a basement, so it can be safely checked from there.
In the last one, the blue should have black sleeve, but it was rarely done. You just link the coms, no need for the key switch to drop power to the normal switch.
The OPs link doesn't work so I don't know what sort of light he has, however why all this talk of 3 core, the only difference between maintained and non maintained is one is lit 24 hrs a day and the other only comes on in a power failure, some EM fittings have a link you remove to make it non maintained, still only need a twin and earth to them. Or has the OP got an normal on/off light with emergency backup.
I have upload a circuit diagram below, I have purchased a Fern Howard emergency light maintained. This is the datasheet for the luminarire. It would still require a 3 core cable as it needs a permanent live and switched live.
So it operates as a normal light as well then. Although I agree with Lec about only using the fish switch on the permanent live to enable the test, the instructions for the fitting say this:- The switched line must be wired so that it disconnects from the luminaire if the Key Switch is switched off (no power to the fitting). NOTE: - Both luminaire supplies must be broken simultaneously (switched and unswitched) when testing They seem to be treating the fish switch as an isolator.
That makes sense. took me a while to figure out. most emergency lights I have seen have been fitted public places or commercial environments, have been wired in single core. I will be installing 3 or 4 emergency maintained lights in the basement, they operate as a normal light so are dual purpose. The grid switch will be located at the top of the stairs, so it can be tested when leading down the stairs.
I have seen a few like this, but would steer clear TBH. The whole point in a test switch is that you can isolate just the perm feed, leaving the switched feed on for the remaining standard light fittings. Maintained fittings it wouldn't matter too much either way, unless mixed with standard fittings.
And bear in mind that the key switch must not cause the supply to the normal lighting to be interrupted.
You wouldn't happen to have a diagram on how to wire up normal lights with maintained em lighting where the key switch will only effect the em lights would you?
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