On 23/11/2010 14:37, Andy Pugh wrote: > On 23 November 2010 14:31, Ian W. Wright<watchma...@talktalk.net> wrote: > >> hell, I've seen our mains frequency >> vary from 47 to 54 Hz over the day many times depending on >> the load and no one ever complains....... > Though supposedly you should still always get 4320000 cycles per day. > Yes, you're right but I'm not sure how close they ahere to that nowadays. With the common frequency dips due to load problems and the tendency for people to convert to quartz timing instead of mains synchronous, I wonder if they bother so much or whether they just try to get it right weekly or some such. Maybe I'll put a mains frequency monitor on here out of interest - its 13 years since I retired from the ratrace of chasing power around plant rooms......
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