Hi all, new to the forum
hoping for some help with my following questions.
I have been asked to take on a project that has had a new 800kva transformer installed by northern power grid and the supply conductors have been installed from the new switchboard underground in 2x sets of 400mm AWA per phase, 1 x 400mm AWA neutral and 240mm cpc. The sets of phase conductors are installed in 2 x 4m of ducting in trefoil along with neutral conductor in single duct between the above two ducts and cpc in separate duct.
the sizing of the conductors appear to have been sized for an 800amp 3phase fused supply from the transformer although I have asked for 500amp fuses as at present 800 amps is not required and I believe it was to allow for future development of the site. The site is going to house 120 residential park homes with ev charger on all homes.
my question is will the neutral need to be larger size for future expansion to allow for an 800 amp supply and should the cpc be larger than 240mm.
From my calculations the phase conductors are fine but correct me if I am wrong just trying to make sure all is correct before I take on the project.
