240v outdoor plugs/socket regs or guidance for industrial work areas

Can someone point me in the direction of regs or good guidance relating to outdoor use of a 16a commando type socket vs 13a standard outdoor domestic socket in an outdoor industrial setting. We have an electrician who is arguing that because of rcd protection the 16a blue sockets are overkill. My view is the 13a plugs/sockets are dangerous in the wet - where the socket has little ip rating once the cover is opened. I’m struggling to find good guidance that supports my arguments.

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  • One of two Walsall Sockets installed outdoors I have seen today, barely under cover. 

    These "oddities" are about if you keep your eyes open and I bet at least one forum member knows where they are.

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  • One of two Walsall Sockets installed outdoors I have seen today, barely under cover. 

    These "oddities" are about if you keep your eyes open and I bet at least one forum member knows where they are.

Children