Figure Q1 shows a school roof on which it is proposed to fit a Photo Voltaic (PV) array upon. It is proposed to use both aspects of the roof elevations. There are no special planning regulations in this location. The site has a three-phase supply. (a) i) Comment on the maximum size of array that can be fitted. How may building regulations and good practice limit the array size? (10 marks) ii) By calculation determine if this scheme would fall under the G98 or G99 regulations. Justify your decision. (5 marks) (b) The client is proposing a single-phase installation at the G98 current limit to maximise the yield. The cable run between the inverter and the service head is 15m. Determine using the table provided in the data book the size of cable that is required. The cable being used is 70C thermoplastic insulated and sheathed flat cable. The method of installation is clipped direct. Explain the assumptions you have used when determining the cable size. You must clearly show all workings and explain each stage of the process. (10 marks) Ridge 45 South I 10m Roof area 50m (10mx5m) Roof area 50m?(10mx5m) Figure Q1. Plan view of school roof (not to scale). END OF QUESTION 1 XE639) 2020/2021 ref Page 2 of 9 Printing date Figure Q1 shows a school roof on which it is proposed to fit a Photo Voltaic (PV) array upon. It is proposed to use both aspects of the roof elevations. There are no special planning regulations in this location. The site has a three-phase supply. (a) i) Comment on the maximum size of array that can be fitted. How may building regulations and good practice limit the array size? (10 marks) ii) By calculation determine if this scheme would fall under the G98 or G99 regulations. Justify your decision. (5 marks) (b) The client is proposing a single-phase installation at the G98 current limit to maximise the yield. The cable run between the inverter and the service head is 15m. Determine using the table provided in the data book the size of cable that is required. The cable being used is 70C thermoplastic insulated and sheathed flat cable. The method of installation is clipped direct. Explain the assumptions you have used when determining the cable size. You must clearly show all workings and explain each stage of the process. (10 marks) Ridge 45 South I 10m Roof area 50m (10mx5m) Roof area 50m?(10mx5m) Figure Q1. Plan view of school roof (not to scale). END OF QUESTION 1 XE639) 2020/2021 ref Page 2 of 9 Printing date