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@REPLYADDR David Billington <djb@invalid.com>
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On 28/09/2023 21:16, Richard Smith wrote:
> You are right - 230V single-phase from the local substation feeding
> the area.
> You went with Tesla`s recommendation of 60Hz which is clearly "just
> right" for long-distance transmission. Where out 50Hz is
> unnecessarily slower and increases the size of transformers, etc.
>
> The only 110V we use in the UK isn`t even "normal supply" - on
> building sites we have centre-tapped transformers so in-effect have
> -55V and +55V. Very safe.
> 230V is a bit too much for construction sites, for sure.
> Residual Current Devices make 230V power tools acceptable for domestic
> work.
Not always 60Hz though after reading about the 1965 US blackout
https://en.wikipedia.org/wiki/Northeast_blackout_of_1965 where it
mentions some areas as 25Hz, also
https://en.wikipedia.org/wiki/Utility_frequency which gives a wide
variety of frequencies early on. IIRC it was mentioned UK Europe went
50Hz as it was better for motors and 60Hz in the US as arc lights were
more stable.
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