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Interlocked sockets

Neil1980
Hi all.


Recently had a contractor carry out a periodic inspection on our site (warehousing and workshops) and they have specified that all the 16A and 32A (1ph & 3ph) sockets need to be interlocked.


Is this true, or are they just finding £5k of additional work to carry out?


I can only find reference to caravan sites (Sec. 708) requiring interlocked sockets. 


Any other sections that reference this requirement on industrial and commercial installations?


Thanks in advance,

Neil

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    Neil,

    I did realise that the paragraph I mentioned referred to auxiliary circuits, but I was struggling as much as you are to find any basis for the contractor specifying interlocking. However I have given it a bit more thought and think it may be 553.1.1, along with table 55.1.  This does not mention interlocking so it is a bit of a jump, but industrial plugs and sockets to BS EN 60309 can be produced  as "interlocked" and "non-interlocked" options (BS EN 60309-2 Clause 12 applies) so it may be this that the contractor is thinking of.

    Anyway, I will be interested to learn what the contractor says.

    Alasdair
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  • 0
    Neil,

    I did realise that the paragraph I mentioned referred to auxiliary circuits, but I was struggling as much as you are to find any basis for the contractor specifying interlocking. However I have given it a bit more thought and think it may be 553.1.1, along with table 55.1.  This does not mention interlocking so it is a bit of a jump, but industrial plugs and sockets to BS EN 60309 can be produced  as "interlocked" and "non-interlocked" options (BS EN 60309-2 Clause 12 applies) so it may be this that the contractor is thinking of.

    Anyway, I will be interested to learn what the contractor says.

    Alasdair
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