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2 x 100% - Lighting

Nick Parker

The Specification says, "The emergency lighting system shall be redundant (2x100%)". The minimum average illumination level provided by the emergency lighting shall be 30% of the level provided by the normal lighting system.

Say, I have designed to meet the requirements of 30% of the level provided by the normal lighting system and I have the below questions
Do I have to duplicate the number of emergency fixtures to meet the redundancy? (or)
Do I have to supply the emergency light fixtures which can accept power from two different emergency sources? (or)
Do I have to supply the emergency light fixtures with inbuilt battery backup to meet the redundancy (or)
Do I need to provide ATS that can combine from two different emergency power sources; with this, Emergency light fixture which can accept one power source can be powered.

Parents

  • If that is all  it says then I agree it is not at all clear what it means.  There is little you can do except request clarification - by the way as a 4th meaning it could also mean that you provide battery EM at 60% of normal lighting levels and then the failure of any one fitting drops you to 30%.

    It is not a standard phrase I have ever seen either, but EM is not something I get involved in much.

    Mike.

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  • If that is all  it says then I agree it is not at all clear what it means.  There is little you can do except request clarification - by the way as a 4th meaning it could also mean that you provide battery EM at 60% of normal lighting levels and then the failure of any one fitting drops you to 30%.

    It is not a standard phrase I have ever seen either, but EM is not something I get involved in much.

    Mike.

Children
  • in reply to mapj1

    I'd read "(2x100%)" as meaning two complete systems - i.e. having no common components or shared points of failure, but would agree it's far from clear and would seek clarification.

       - Andy.

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