Re: When were ring mains introduced in domestic housing?
Hi!
My friend's semi, built in 1958, was wired ring–mains but only one single socket–outlet was provided in each room!
Trouble is improving it now would be a massive upheaval because we're cram–jam in every room now!
With regards to lighting circuits, the modern system, generally referred to as "loop–in", was introduced in 1966 along with requirements for a continuous p.e. conductor (then referred to as "earth–continuity–conductor" in those days) – this allowed the modern style of low profile four–terminal ceiling rose to be used instead of the old–fashioned bulbous type.
The remaining types of circuits have been unchanged for many decades, the main differences between old and new circuits are the colour–coding, use of modern mcbs, and relaxations on regulations regarding "diversity" (a calculation that allows lower–rated circuits to be installed based on consuming appliances and loads only being part used at any one time!)
Chris Williams
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It's an enigma, that's what it is! This thing's not fixed because it doesn't want to be fixed!
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