Think it was more that 15A suited some of the long runs of cables, likely
appliances and size combinations in the olden days. I think 20A became
more popular with the advent of more\higher rated appliances, and then
ring mains became the norm.
Was'nt it commercial/industry that always used 20A for radial
circuits and its filtered down ?
Dave
--
Some people use windows, others have a life.
|