Quote:
Originally Posted by Ed_Dinning
Hi Brigham, that dates the equipment a bit: 40Hz was the old NESCo frequency and was upped to 50Hz in the 30's when a grid system (proposed originally by NESCo) was introduced nationally
Ed
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It's mainly 1960s gear. Although NESCo went to 50 cycles pre-war, ICI Billingham remained on 40 c/s until the mid-sixties at least.
There were more homes on the ICI power station than on NESCo until the end of the '50s!