Quote:
Originally Posted by russell_w_b
I well remember open-wire cadmium-copper wires to pot-heads on the premises, but I can't remember what went from pot-head on the wall to lightning arrestor in the hall. Was it two single-core lead-sheathed secured by lead cleats on steel wedges? Or was it twin lead-sheathed cable secured similarly?
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Originally two core lead, but later replaced by some kind of plastic flat or figure of eight cable whose name I forget. I have a feeling one wire was tinned to indicate polarity.
When I started my apprenticeship in 1967 the use of drop wire for new installations or replacements was almost universal. However the training schools (Bletchley Park in my case) still taught the installation of bare copper drops and then cable from the insulator to the protector, in addition to the use of drop wire. A case of overlapping syllabuses like valves and transistors.