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BS 1363 13A Socket Continuous Max Load

sparkiemike

Let me start by saying this is NOT about the maximum load of a double socket outlet, that has been done before!

At a recent Elex “seminar” Darren Staniforth from Scolmore made a comment that BS1363 socket outlets were only tested for 8A continuous load. This was news to me because my 1995 version of BS1363-2 says for the Temperature rise test the connected load will be 14A for a minimum continuous period of 4hours or longer until stability is reached and max duration of 8hours. 

If I recall the comments at Elex correctly, he then went on to say the latest version of BS1363 made provision for socket outlets to have a continuous load of 13A to cater for equipment like EV chargers ("granny cable") and these “plug and play” 13A hot tubs that seem so popular now. Also that some manufacturers (maybe Scolmore?) were now making socket outlets to accommodate these large loads of long continuous periods.

So my question is, does anybody know what BS 1363-2:2016+A1:2018 says about continuous loads that is different from before? And if there is a change which manufacturers are making socket outlets to the latest standard?

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    Chris Pearson: 
     

    Sparkingchip: 
    A 10 amp RCBO or MCB cannot be run fully loaded at 10 amps for an extended period, it has to be derated, therefore a 10 amp EV charger needs a 16 amp protective device.

    433.1.1 does not say that. It simply says Ib ≤ In ≤ Iz so Ib and In are allowed to be equal.

    What is not permitted is a small overload of long duration - 433.1.

    If a nominally 10 A MCB could only carry a sustained load of say 8 A, it should be rated at 8 A.

    First off the Masterplug unit has a 13 amp socket outlet that is not restricted to charging an EV at 10 amps, so a 10 amp OCD is not suitable as it could easily be overloaded by 30% with a 13 amp load.

    Secondly, BS7671 doesn’t tell you how to select MCBs, you need to look beyond the regs book and refer to manufacturers data and derate MCBs accordingly.

    2d5661ce1040b65c6ae751ac97b2f222-huge-1754a566-4736-4049-901a-7d5187936ad5.jpg

     

    https://www.hagerelectro.com.au/files/download/0/32587_1/0/TECHINFO_MCBS.PDF

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  • 0

    Chris Pearson: 
     

    Sparkingchip: 
    A 10 amp RCBO or MCB cannot be run fully loaded at 10 amps for an extended period, it has to be derated, therefore a 10 amp EV charger needs a 16 amp protective device.

    433.1.1 does not say that. It simply says Ib ≤ In ≤ Iz so Ib and In are allowed to be equal.

    What is not permitted is a small overload of long duration - 433.1.

    If a nominally 10 A MCB could only carry a sustained load of say 8 A, it should be rated at 8 A.

    First off the Masterplug unit has a 13 amp socket outlet that is not restricted to charging an EV at 10 amps, so a 10 amp OCD is not suitable as it could easily be overloaded by 30% with a 13 amp load.

    Secondly, BS7671 doesn’t tell you how to select MCBs, you need to look beyond the regs book and refer to manufacturers data and derate MCBs accordingly.

    2d5661ce1040b65c6ae751ac97b2f222-huge-1754a566-4736-4049-901a-7d5187936ad5.jpg

     

    https://www.hagerelectro.com.au/files/download/0/32587_1/0/TECHINFO_MCBS.PDF

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