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Self-testing emergency lights BS 5266-1:2016

Tom D

I just need confirmation as I couldn't find the info in the BS5266 book.

If I choose self-testing emergency lights for my project do I still need an "old fashioned" emergency lighting test key switch to do regular monthly or annual tests?

Self-testing lights are smart enough to indicate visually or audibly once the problem has been detected so I guess it is not necessary to have test key switches as well but some places still do it, why?

  • 0 in reply to AJJewsbury

    On the ones I have been looking at they have used MK double pole grid switches with the neutral passing through the switches too.

  • 0 in reply to whjohnson

    I think isolation is more to do with the clearance and creepage distances - N often doesn't need to be broken for isolation in TN systems.

      - Andy.

  • 0 in reply to whjohnson

    Might be worth looking at using a contactor per floor of the building to achieve isolation and then a key switch for manual testing even if it is a Self testing system. The flip side of that is the cost but if the customer is happy to pay

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