Your assumption is wrong. Read dpeirish carefully.He has multiple conductors per phase (feeders).
"Multiple conductor feeders" had me going. I presume then that each phase is carried by four wires all connected in parallel
He also has a small clamp on his amp meter.
So I had presumed
Look here a typical installation with multiple conductors feeders: He cannot measure each phase with a clamp like this:
Thank you for that Tim\ but yes, I'm familiar with the clamp meter
I had suposed however that he could separate from the bundle the 4 wires carrying each phase, then clamp. Am I still in the dark
As the conductors have the same cross-section, they will carry the same current.
Of course, provided there's nothing wrong. I had wondered whether Dp might wish to compare current readings for some reason
…..you either measure one…...and multiply…...or you measure each one and add them. Is that clear?
Yes Tim I really do understand all that sort of thing, it's just a matter of terminology
As for the use of DC current on the underground trains, read the DC current section here: Electric power transmission
Thanks Tim, I do recall now that dc is sometimes better for long distances because ac loses energy by radiation. as if the conductor were an antenna
See I really do comprehend this sort of stuff. In fact as an erstwhile writer and inventor I have several patents on electrical circuits