The Local Authority I work for as an Electrical Engineer is developing low carbon three story flatted residential properties with six flats in each block.

Each flat has its own single phase supply and there is 3-phase landlord's supply covering the common areas

The Mechanical Consultant has specified Air Source Heat Pumps as heating and hot water solution which is fine.

I am not at ease with the arrangement of the equipment the indoor unit is in the flat which is OK but the outdoor unt rather than being mounted on a balcony or wall of the flat it serves is located in separate out building.

This does not seem right as I have export a final circuit from the tenants consumer unit out with the boundary of their property through the common area then right outside the building to an out building.

Also the out building accommodate six final circuits all from different metered installations and also circuits from the landlords supply.

This seem highly irregular to me as all the guidance I have looked at for installed ASHP's states that in a flatted properties that ASHP's should either be a individual systems installed in the flats or a central system in which case it would be on common ground and be fed from the landlords supply.

Does anyone know of any regulations that advises against or prohibits final circuits from different DNO metered installation being mixed in the soom area / room? I have also asked this question to the DNO

Any feed back will be appreciated

Thanks

Alan Gray