If its coming from lv side of transformer to feed a switchboard i would have thought it would need a neutral because the star point connection would be at the transformer winding
If you went down the 3 comp.truking route you could drill drill say 20mm hole in the bottom of trunking then continue drilling in the same line through to the next compartment ect. sending conduits through to the respective compartments,but it would compromise trunking capacity.What about...
you would be looking at 3 compartment trunking prob. 150x50 and you could use manufactured cross-over tees ect. or you could just drill holes in bottom or sides and use conduit to points
Its a problem young couple only moved in this year few weeks dry weather readings might?? improve (but might come back) don,t know if they could claim from company that did survey?
Called out to house today"no power" front ring dead short switched ring mcb off reset board ,disconnected front grd.floor sockets 2 legs of ring and 1 spur dead short (god knows where spur is connected to ring ) solid floor 75mm approx screed beneath 20mm high quality t&g polished floor boards...
Only done 1 pool 25mtr at leisure centre and electrical consultants showed 2 earth bonds to re-bar under the pool taken to earth bar in pool plantroom also all sockets that were sunk int floor along sides of pool for handrails to fit into had to be bonded back to earth bar
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