Existing REC & house supply

[cliffed]

just thoughts on this one.
Existing supply to barns from REC,300 amp Tncs 3p,cabling to House,fused of this via 100 amp cutout,by REC
Sub main 16 mm 2 core,to house.
Will the main bonding conductors be the size of the existing supply ie: 300 Amps regarding the neutral.

 

[cliffed]

Is the 'submain' a private cable or DNO? If DNO they may be able to provide a TNCS connection at the load end if you enquire and you could then treat it as a 100a TNCS incomer..

Submain swa 2 core

 

[Wilko]

Hi - I think it's likely 25mm or 35mm would be needed (from Table 54.8). Not much help if it's all been installed and paved over, sorry ...

 

[cliffed]

Thanks,it frustrating,it’s been in forever,I’ve spotted it,but ain’t sure what’s gonna happen,most probably stay like it is