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Lift power supply disconnection time

Apostolos
Good morning.

Would you classify the power supply from the main distribution panel to the lift as a sub main (5 sec disconnection time) or as a final circuit (0.4 sec disconnection time)?

The lift will take this power supply and ......if I am not wrong ..... distribute it further to lights and other automation components, so doesn't this mean that this is not a final circuit?

Thanks
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  • Former Community Member
    0 Former Community Member
    Well, I guess you could interpret it every way you want - for me, for simple compliance, if you assume the lift is a "black box" covered by it's own standards, then you are putting a final circuit in to supply that box.


    As the rating is less than 32A, then BS 7671 would suggest that you use 0.4 seconds as the TN disconnection time


    Given that you have a 16A MCCB proposed, unless you have a particularly ropey supply source, then achieving 0.4 seconds shouldn't be a drama


    I've no idea where you intend supplying the shaft lighting and pit and car top control sockets (or is it part of the lift specialist contract) but if you look at (i) of the regulation, you might conclude that you need 0.4 seconds anyway (although you could expect that the lift supplier does have protection on that socket outlet that would comply in all respects with BS 7671 and the major parts of EN 81)



    Your circus, your monkeys - so up to you as the designer which way you go. I'd err towards simple compliance personally


    regards


    OMS
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  • Former Community Member
    0 Former Community Member
    Well, I guess you could interpret it every way you want - for me, for simple compliance, if you assume the lift is a "black box" covered by it's own standards, then you are putting a final circuit in to supply that box.


    As the rating is less than 32A, then BS 7671 would suggest that you use 0.4 seconds as the TN disconnection time


    Given that you have a 16A MCCB proposed, unless you have a particularly ropey supply source, then achieving 0.4 seconds shouldn't be a drama


    I've no idea where you intend supplying the shaft lighting and pit and car top control sockets (or is it part of the lift specialist contract) but if you look at (i) of the regulation, you might conclude that you need 0.4 seconds anyway (although you could expect that the lift supplier does have protection on that socket outlet that would comply in all respects with BS 7671 and the major parts of EN 81)



    Your circus, your monkeys - so up to you as the designer which way you go. I'd err towards simple compliance personally


    regards


    OMS
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