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Grid switch ratings enquiry

Farmboy
Had an interesting chat with a tech dept this afternoon after coming across some grid switches in a domestic kitchen.


Four grid switches (sharing a common backbox) are each fed via their own 16A cb's, and each feeds 1G sockets (for a cooker hood, fridge freezer, etc). Ignoring the cable sizes (the focus being on the grid switches), given the 13A plug fuses limits the loads in each cct, would you have the current rating of the grid switches equal to or higher than the 16A cb's (e.g. 20A), or lower (but equal to or higher than the socket rating e.g. 13A/14A)?


F
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    -2400-:

    To add to the chance of confusion, the MK technical data for Logic Plus range states:


    Current rating

    13A

    (3 Gang Switchsocket 13A total)


    which without any further information, it would be reasonable to interpret as though the 2 gang was 2 x 13A, otherwise they might have written

    (2 Gang and 3 Gang are 13A total)

     






    BS 1363-2 requires the manufacturer to mark the rating of the accessory on it ... and this has been done.


    So "it would be reasonable to interpret" is in my opinion an assumption at best. I'm sure I needn't complete the popular engineering saying that begins "Assumption is the mother of all ..."

    I believe it's been clearly demonstrated that the "stress" test in BS 1363-2 isn't even carried out at 26 A (2 x 13 A)


    The data is clearly telling you quite simply that, despite the fact there are three outlets, this still means the whole unit is only rated at 13 A - but it does NOT in any way say that the rating of the double socket-outlet is rated for anything other than its stated rating.

Reply
  • 0

    -2400-:

    To add to the chance of confusion, the MK technical data for Logic Plus range states:


    Current rating

    13A

    (3 Gang Switchsocket 13A total)


    which without any further information, it would be reasonable to interpret as though the 2 gang was 2 x 13A, otherwise they might have written

    (2 Gang and 3 Gang are 13A total)

     






    BS 1363-2 requires the manufacturer to mark the rating of the accessory on it ... and this has been done.


    So "it would be reasonable to interpret" is in my opinion an assumption at best. I'm sure I needn't complete the popular engineering saying that begins "Assumption is the mother of all ..."

    I believe it's been clearly demonstrated that the "stress" test in BS 1363-2 isn't even carried out at 26 A (2 x 13 A)


    The data is clearly telling you quite simply that, despite the fact there are three outlets, this still means the whole unit is only rated at 13 A - but it does NOT in any way say that the rating of the double socket-outlet is rated for anything other than its stated rating.

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