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BEAMA guide to CB/RCBO selection for use with LED lighting



BEAMA have produced a guide to CB/RCBO selection for use with LED lighting, found here:
https://www.beama.org.uk/resourceLibrary/beama-guide-to-circuit-breaker-selection-for-led-lighting-.html
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  • I suspect we can, though it is not not quite a simple current scaling.

    Let us see what the curves are telling us.


    Firstly important to note that  the inrush problem is more serious when large numbers of small lamps are switched together compared to a few big ones.

    ( so 300W of 10W fittings may be the same inrush as more like 1kW of 75 watt ones - looking at the C10)


    Comparing 10A and 16A curves they give,and looking at the ends of the curves, we see

    15 *10W and 4*75W  for the B10 and

    These become

    22* 10W and 8* 75W for the B16


    30*10W and 5*150W for the C10

    These become 22* 10W and 8* 150W for the C16


    not quite 1.6 to one from 10A to 16  however -  15/22 is more like 1.4


    So I'd expect the 6A C type numbers to be more like 0.4 of the 10A ones, not 0.6 as you may expect

    I'd also expect a 6A B type to be troublesome with more  than about 50W of low wattage  LED loads ,. and therefore not recommended for very much beyond the smallest set-up.



    8aad423c99a4a6fd99579c393427fea1-original-10a-led_inrush.pnge670c41a0e1fcb00d07cf9f029312f77-original-16amcb_ledinrush.png

    M.
Reply


  • I suspect we can, though it is not not quite a simple current scaling.

    Let us see what the curves are telling us.


    Firstly important to note that  the inrush problem is more serious when large numbers of small lamps are switched together compared to a few big ones.

    ( so 300W of 10W fittings may be the same inrush as more like 1kW of 75 watt ones - looking at the C10)


    Comparing 10A and 16A curves they give,and looking at the ends of the curves, we see

    15 *10W and 4*75W  for the B10 and

    These become

    22* 10W and 8* 75W for the B16


    30*10W and 5*150W for the C10

    These become 22* 10W and 8* 150W for the C16


    not quite 1.6 to one from 10A to 16  however -  15/22 is more like 1.4


    So I'd expect the 6A C type numbers to be more like 0.4 of the 10A ones, not 0.6 as you may expect

    I'd also expect a 6A B type to be troublesome with more  than about 50W of low wattage  LED loads ,. and therefore not recommended for very much beyond the smallest set-up.



    8aad423c99a4a6fd99579c393427fea1-original-10a-led_inrush.pnge670c41a0e1fcb00d07cf9f029312f77-original-16amcb_ledinrush.png

    M.
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