I have to disagree on this one. My 1965 house was CI soil pipe and the 2 branches for basin and bath were 2¼" (external diameter) CI, final piece to trap being brass compression fittings and copper pipe.Waste pipes wont be cast iron. Choices would be, copper, mild steel, or lead, but Compression Waste fitting should be ample to make a connection. Just be careful if cutting lead, it may collapse out of shape if you're too heavy handed.
If the smaller sections didn't meander around I'd have happily agreed, the basin was 2x 3ft lengths a short bit and 2 elbows, bath was a 6ft length, 4 short bits and 3 elbows.Technically the 'waste pipe' was the copper and the 2 1/4" CI branch was classed as part of the stack. The CI stack and branches were hemp and lead soldered together so were then considered all the same pipe. The transition to copper would then be classed as the waste pipe which is now 32mm/40mm plastic.
That being said some of the older basin s traps were purely formed lead with a wiped joint straight into the cast, Ive got one of them sitting outside just now in the scrap pile.
One of the 1930's office buildings I worked in was exclusively CI in the toilets.That's a good question, I was always told and it was always described that any part of the cast iron pipework whether it be the main stack or the toilet soil pipe or smaller permanently connected CI branches feeding into it as part of the stack. Any smaller non cast 'moveable' internal pipework was then called the waste run.
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