Hi Chris, 2008/10/3 Chris Cheney <[EMAIL PROTECTED]>:
> A bit of Googling finds: > > Frequency: "a variation not exceeding 1 per cent above or below the > declared frequency;" > (http://www.statutelaw.gov.uk/content.aspx?LegType=All+Legislation&title=e > lectricity+safety+quality+continuity&searchEnacted=0&extentMatchOnly=0&con > fersPower=0&blanketAmendment=0&sortAlpha=0&TYPE=QS&PageNumber=1&NavFrom=0& > parentActiveTextDocId=1590332&ActiveTextDocId=1590368&filesize=4590 - > section 27(3)(a)) Hmmm... that would make a mockery of keeping time on the large number of mains timed clocks in the UK. They would be out by a minute about every hour and a half or a quarter of an hour each day, which would be hopeless! > Electric clock time: "NGET will endeavour (in so far as it is able) to > control electric clock time to within plus or minus 10 seconds" > (http://www.nationalgrid.com/NR/rdonlyres/4894C7AA-DCD2-4835-9986- > 57338C31C86A/9922/BC3_i3r18.pdf - section BC3.4.3) For some reason I could not get this link down, it just keeps stopping about a third of the way through. The title does not give an idea of the nature of the period for which the 10 seconds drift is acceptable. > BTW wrt earthing via the incoming water main - in the UK, plastic pipe is > commonly used for incoming water mains these days. That is probably the case now so I guess they must put a local earth spike instead. What I was trying to convey was that there was a local earth at each house. 73 Steve -- Steve Rooke - ZL3TUV & G8KVD Omnium finis imminet _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
