Requirements for RCD protection on a 32a Socket supplying Mobile Equipment

I have been presented an EICR with a code 2 referencing Regulation 411.3.3, no 30mA RCD protection for socket outlets under 32amp. The 32a socket has a 100mA Time Delay RCD fitted, as it's being used to supply a local DB within a cabin. My initial thoughts were this was satisfactory and shouldn't have been coded a C2 due to the requirement for discrimination between the RCD's to avoid nuisance tripping, now I am not so sure. 

Parents
  • Why was the 32-amp socket installed and why is it being used to supply the cabin, instead of the cabin supply being hard wired?

    What type of premises is it installed at and how are the premises and the cabin used?

  • I assumed installed with regards to a bit of flexibility of location of these porta cabins (installed before I took over the site). Contractor site office. 

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