- Reaction score
- 67,272
think what spin is referring to is when the L for the landing light is taken from the downstairs as in a 2 gang switch for hall (1 way) and (2 way) for landing, with the L linked between the commons. was done regularly in 60's and 70's . we'd not do this today, but back then, it was accepted, along with wind-up meggers and bang tests. loop impedance was how long an apprentice could hold onto 500V from the megger before screaming for his mum.