Hello Andrew
Many thanksfor such a detailed reply.
I will tryand tell you what if think we need here.
We have a100amp overhead supply into the house PME supply. The work shop in question isvery small only 20ft x 8ft on the consumer unit we have a 50amp MCB for thesmall workshop going into that we have a 3 core 10mm2 SWA cable going 70meters, at the workshop end is a 6-way consumer unit. I only need a couple ofsockets. I have a twin socket (socket 1 on a 20amp MCB) that I was thinking ofkeeping for the CNC, plugging the 4-way surge protection lead into it and then puttingthe monitor, PC and the control box into the extension lead. I only have onstrip light with a plug on the end that I was going to plug into the secondtwin socket on its own MCB. There is no ground spike at the house or workshopwe understood the PME supply to be sufficient I am not sure only going on whatthe electrician told me. The workshop is a metal container and I have an earthspike on the shelf doing nothing, if need be I could bang it in the ground. Ifso would I put the cable into the consumer unit or just fix it to the shippingcontainer itself? Perhaps I am heading in the right direction or doing a no no!

Many thanks

Steve