Thats great, i really appreciate your timely response. Thank you. I was thinking about getting a multimeter (fluke or klein tools), so i will definitely test the earth. What is the desired range for resistance in this setup please? What exactly is the difference between mains neutral to earth busbar first, as per regs, or as in my case, both mains to breaker with a link between earth bar and neutral please? Im not planning on using an rcbo main breaker, but singular rcbo's after the 100a main breaker. I think if im right, that i would need a CU case with a 2nd neutral bar, so as to keep them separate or downstream of the ne link, as you mention. One more question if I may? I would like to fit a 100a modular isolation switch(cut off) between the meter and the CU because those chunky main tails barely make it through the wall. My thoughts were i could use a 100a cut off in place of the old CU case to change from the thw-a 50mm sq aluminium cable on one end to THW 35mm sq copper tails to the CU, giving me more length on the tails into the new CU, with the ability to work on the CU without asking the MEA to disconnect everytime this was needed. Do you think this would work? If so, do you know of any such devices, other than the chang lever style 100a crab arm switches because i generally cant find anything other than this or cheaper chinese switches like the The TOMZN TOG100 (often designated as TOBIZ-100 or TOB1Z-100) is a high-capacity DIN-rail miniature circuit breaker (MCB) or isolator cut-off switch. It safely isolates circuits. Many thanks again.
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