imperial freezer inquires

imperial freezer
i do not know, do i need rewire this shop or not and explain WHY?

i need write a clear recommendation, not a report, to the owner.
certain information is:
the cables are all PVC/PVC imperial size.
the protective devices are all BS3036 semi - enclosed fuses,
many existing cables are surface - mounted and within touching distance of the people using the shop,
there are a number of long trailing extention leads,
the supply is three - phase, four - wire and the earthing system is TN-S.

beside:
1. there is a freezer in this shop with existing 7/044 twin cable, which is considere to be too small. a design has been carried out and the new cable will be a 10/4mm squares twin+c.p.c cable. the cable is to be installed within the fabric of the building, but all current system must remain in place.
2.the local distributor is upgrading its system to a TN-C-S system increasing the prospective fault to 9kA.
i want to investicate the appropriare type/s of protective device that might be used giving reasones for my choice/s.

Here in the UK, what you have got is highly illegal, if anyone in authority saw it, they would close you down immediately, and prosecute you, Three phase close to anyone, who knows nothing about it, is highly dangerous.

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NycroO A1's SF

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