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Power cable connection on a mobile installation to External equipment using a MIL-DTL-38999 connector.

Samantha Rendell

So I've inherited a a mobile installation project. The power cable connection on to External control equipment uses a dedicated port with a MIL-DTL-38999 connector. 

The inrush when the charging system is engaged trips the RCD when it is set to 30mA. My predecessor determined that the connection is not classified as a socket and increased the RCD trip current to 300mA.

Given that it uses the 38999 connectors and it is solely dedicated to the dismounted control systems that form part of the system is this a valid assessment? 

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  • 0

    If BS 7671 must be used, it does not matter whether the circuit has a socket-outlet, if the equipment is (or could be) used outdoors.

    Circuits for mobile equipment for use outdoors with rated current less than 32 A must be protected by 30 mA RCD in AC systems, and exceptions are not permitted ... Regulation 411.3.3

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  • 0

    If BS 7671 must be used, it does not matter whether the circuit has a socket-outlet, if the equipment is (or could be) used outdoors.

    Circuits for mobile equipment for use outdoors with rated current less than 32 A must be protected by 30 mA RCD in AC systems, and exceptions are not permitted ... Regulation 411.3.3

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  • 0 in reply to gkenyon

    Though I could observe this is not wiring that is for supply of mobile equipment, rather this whole thing is mobile and has its own genset onboard - but of course ideally a similar safety standard should be observed. I don't think BS7671 is feels like quite the right approach.
    And there is a further thought - when was it brought into service ? It may well have been designed with the philosophy of some previous regs edition.
    Mike.

  • 0 in reply to gkenyon
    gkenyon said:
    Circuits for mobile equipment for use outdoors with rated current less than 32 A must be protected by 30 mA RCD in AC systems, and exceptions are not permitted ... Regulation 411.3.3

    A very good point! However, most things which are not planted into the ground are mobile if you have the resources.

    Fortunately, BS 7671 provides us with a definition. I doubt that Samantha's machinery falls into that category.

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