A generous cable size is good practice to reduce voltage drop at the load end, and in particular to avoid obtrusive lamp flicker when motors or large heaters such as electric showers are switched.

Also as this is a DNO cable, THEY are paying for the losses between transformer and meter.

If you, or a future customer use a substantial and long hour load the cost of losses are significant.

Finally, they may wish to use this new cable to supply other customers in future.


Hopefully they are replacing the transformer ? DNOs take an optimistic view of transformer ratings, but adding a three phase 100 amp load of about 72 KVA to an existing 50 KVA transformer might be a bit over optimistic, since it may be presumed that significant load is already connected.

A generous cable size is good practice to reduce voltage drop at the load end, and in particular to avoid obtrusive lamp flicker when motors or large heaters such as electric showers are switched.

Also as this is a DNO cable, THEY are paying for the losses between transformer and meter.

If you, or a future customer use a substantial and long hour load the cost of losses are significant.

Finally, they may wish to use this new cable to supply other customers in future.


Hopefully they are replacing the transformer ? DNOs take an optimistic view of transformer ratings, but adding a three phase 100 amp load of about 72 KVA to an existing 50 KVA transformer might be a bit over optimistic, since it may be presumed that significant load is already connected.