7711 Primary power supply (0) The distribution of the LV supply from the site generating plant, the supply authority's main or from the site transformers, including termination of the LV cables to the transformer, to the building main switchgear panel, with all associated work, materials and equipment including any pillar and meter boxes 7712 HV supply (0) The distribution of high voltage electricity from the supply authorities main or from the site generated supply to the on-site transformer sub-station 7713 Substation equipment (0) The provision of substation equipment for receiving a HV supply and transforming it for LV distribution 7714 HV site reticulation (0) The distribution of high voltage electricity around a site 7715 Prime mover plant for generating electrical energy (1) Prime movers for electricity generation 7716 Generators and alternators (3) Generators and alternators for the production of electrical energy 7717 Solar cells (5) Assemblies of solar cells, used to produce direct current electricity, distributed to user points from storage batteries and/or converted to a.c. current and connected back to the grid 7718 Wind-impelled generator sets (17) Wind-impelled generator sets, used to produce direct or alternating current