Re: Another unusual plug and some other questions
Double-pole fusing was quite common - I grew up in a house built in 1959 which had double-pole fuses in the main fusebox. Everything - 5-amp circuits for upstairs/downstairs and outside lights, two 30-amp ring-mains, a 15-amp circuit for the immersion-heater, a 60-amp(!) circuit for the kitchen/scullery and a 30-amp feed to the garage/workshop - all were double-fused.
These were all on GEC porcelain rewireable fuse-carriers in four big metal-clad enclosures. We had a three-phase supply, and it was quite common in winter to lose a phase when a tree took out one or two of the overhead lines.
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