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6A lighting cct to supply a 13A socket

Farmboy
So, we all know about feeding lights from a socket cct, but would you do it the other way around, running on to a single 13A socket from a 6A lighting cct (which is wired in 1.5mm2, to run a few LED's) to supply a lawn mower and similar items? Somebody was given a quote to install the socket.


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    AJJewsbury:

    A few subtleties to consider...




    There is nothing to stop you fitting a light bulb to a 100A circuit as long as the cable can withstand the possible short circuit condition.



    If by a "light bulb" you mean something that fits into a the the usual sizes of BC or ES lampholders, then BS 7671 stipulates a maximum of 16A (559.5.1.204).

     

    Could you have a 20A/1.5sq.mm. (method C)  lawn mower circuit with some lights on it?



    You might also have to consider the (probably 6A rated) lightswitches on the circuit as well as the cables - even though they're not in the path to the lawnmower (or whatever) they and so overload isn't a worry, the still need to be protected from faults, using a higher rated OPD could undermine that. The rewritten section 536 in the 18th makes that requirement more explicit that it used to be.


      - Andy.

     




    Now now Andy, did I suggest any of those things?

    The basis of the question is about circuit ratings, perhaps you need to study the bigger picture.

    This is not about anything but correct use of the regulations, and these are not there to make any safe circuit design unusable. Whatever load is applied in the OP example is quite safe, it may just trip the CPD, which is the only point in question. I have no idea where lawnmowers and stair wells came from, and as for electric vehicle charging? Strangely no mention of RCDs....or even TT..........

    Regards

    David

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  • 0

    AJJewsbury:

    A few subtleties to consider...




    There is nothing to stop you fitting a light bulb to a 100A circuit as long as the cable can withstand the possible short circuit condition.



    If by a "light bulb" you mean something that fits into a the the usual sizes of BC or ES lampholders, then BS 7671 stipulates a maximum of 16A (559.5.1.204).

     

    Could you have a 20A/1.5sq.mm. (method C)  lawn mower circuit with some lights on it?



    You might also have to consider the (probably 6A rated) lightswitches on the circuit as well as the cables - even though they're not in the path to the lawnmower (or whatever) they and so overload isn't a worry, the still need to be protected from faults, using a higher rated OPD could undermine that. The rewritten section 536 in the 18th makes that requirement more explicit that it used to be.


      - Andy.

     




    Now now Andy, did I suggest any of those things?

    The basis of the question is about circuit ratings, perhaps you need to study the bigger picture.

    This is not about anything but correct use of the regulations, and these are not there to make any safe circuit design unusable. Whatever load is applied in the OP example is quite safe, it may just trip the CPD, which is the only point in question. I have no idea where lawnmowers and stair wells came from, and as for electric vehicle charging? Strangely no mention of RCDs....or even TT..........

    Regards

    David

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