A friend asked me why the lights in his house always seemed so dim. A quick investigation found that below spec voltage was the primary cause since although getting something in the region of 230V mid morning, it fell to about 205V at 7pm. This is obviously below the minimum threshold and probably worthy of complaint to someone.
However, some more testing also revealed that the supply impedance was also pretty poor at the house - getting on for 0.5 ohms in fact. Hence at maximum load he could be looking at a supply voltage of just over
100V! (not that you would eve be able to reach 100A loading given the available voltage).I also noticed that the supplier had fitted a meter rated at 40A after the 100A main fuse. How common is this?
The supply looks like it starts life at a power pole with its own transformer supplying about four houses. The last few meters of cable running underground before it reaches the house. House earthing is PME, and this is a reasonably recent install - less than 15 years old.