Re:UK to ban sale of new petrol and diesel cars from 2030: FT
by VBprogrammer on Sunday November 15, 2020 @12:55PM
(#25103156)
Tesla's new fast chargers support 250kw peak per car. So even 12kw is nothing to write home about. How many poles is that shared between? If it's more than 4 then it's not really enough. I suspect the reason the conductor is over specified though is to avoid voltage dropping outside of the 10% range it's allowed.
Re:UK to ban sale of new petrol and diesel cars from 2030: FT
by throwaway201103 on Sunday November 15, 2020 @01:17PM
(#25103364)
What's the carbon footprint of all the extra copper needed for the heavy gauge wiring?
The main difference is that (a) each street light is actually ~ 10W, and (b) the wiring is massively over-specified. Quoting from a local authority source for street lights, [1], the minimum conductor area allowed (for the 220-270 VAC supply) is 6 mm^2, for a total thermal current limit of around ~55A. If you have, say, 100 lamps on a single "ring main", you still only have a power draw of ~1 kW, where the cable is rated to 55 V x 220 A ≈12.1 kW minimum.
[1] https://www.durham.gov.uk/media/3075/Street-Lighting-Specifi...