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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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    Chris Pearson:




    -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)




    Glad not to be alone on this one, but equally well they have not specified 2 x 13 A.


    I maintain that a twin socket is rated at 14 A + 6 A. That is not necessarily the same as, for example, 10 A + 10 A. It may be more or less onerous.


     




    The standard does not say that. It says:


    • The double socket-outlet is stress tested with 14 A + 6 A loads connected.

    • The manufacturer marks the rating on the accessory


    In the case of a double socket-outlet, the rating is clearly marked (on the rear) with, usually, 13 A these days.

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  • 0

    Chris Pearson:




    -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)




    Glad not to be alone on this one, but equally well they have not specified 2 x 13 A.


    I maintain that a twin socket is rated at 14 A + 6 A. That is not necessarily the same as, for example, 10 A + 10 A. It may be more or less onerous.


     




    The standard does not say that. It says:


    • The double socket-outlet is stress tested with 14 A + 6 A loads connected.

    • The manufacturer marks the rating on the accessory


    In the case of a double socket-outlet, the rating is clearly marked (on the rear) with, usually, 13 A these days.

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