Date: Thu, 2 May 2019 22:17:30 +0100 From: Bob Bishop <rb@gid.co.uk> To: "Julian H. Stacey" <jhs@berklix.com> Cc: "N.J. Mann" <njm@njm.me.uk>, freebsd-stable <freebsd-stable@freebsd.org>, Michelle Sullivan <michelle@sorbs.net> Subject: Re: ZFS... Message-ID: <D8560EB9-97C7-41D4-98A2-54EB2258C0A8@gid.co.uk> In-Reply-To: <201905021817.x42IHG7U052982@fire.js.berklix.net> References: <201905021817.x42IHG7U052982@fire.js.berklix.net>
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Hi, > On 2 May 2019, at 19:17, Julian H. Stacey <jhs@berklix.com> wrote: >=20 > Hi, Reference: >> From: "N.J. Mann" <njm@njm.me.uk> >> Date: Thu, 02 May 2019 18:18:16 +0100 >=20 > "N.J. Mann" wrote: >> Hi, >>=20 >>=20 >> On Friday, May 03, 2019 03:00:05 +1000 Michelle Sullivan = <michelle@sorbs.net> wrote: >>>>> I am sorry to hear about your loss of data, but where does the = 11kV come from? >>>>> I can understand 415V, i.e. two phases in contact, but the type of = overhead >>>>> lines in the pictures you reference are three phase each typically = 240V to >>>>> neutral and 415V between two phases. >>>>>=20 >>>> Bottom lines on the power pole are normal 240/415 .. top lines are = the 11KV distribution network. >>>=20 >>> Oh and just so you know, it=E2=80=99s sorta impossible to get 415 = down a 240v connection >>=20 >> No it is not. As I said, if two phases come into contact you can = have 415v between >> live and neutral. >=20 > With 3 phase: > - 415 between each of the 3 live phases > - 240 between neutral & the 3 live phases ... and that=E2=80=99s RMS, so 586 and 325 peak respectively. > (To visualise: draw a circle of radius 12 cm, mark off dots on circle = at > 120 degrees. measure between dots: 20.75cm, Neutral is compass hole in = paper ) >=20 > PS UK/Britain was nominal 240V, but EU inc UK is now nominal 230V = +10%/-6% > https://en.wikipedia.org/wiki/Mains_electricity#Standardisation >=20 > Cheers, > Julian > --=20 > Julian Stacey, Consultant Systems Engineer, BSD Linux Unix, Munich = Aachen Kent > http://stolenvotes.uk Brexit ref. stole votes from 700,000 Brits in = EU. > Lies bought; Campaigns fined; 1.9 M young had no vote, 1.3 M old = leavers dead. > _______________________________________________ > freebsd-stable@freebsd.org mailing list > https://lists.freebsd.org/mailman/listinfo/freebsd-stable > To unsubscribe, send any mail to = "freebsd-stable-unsubscribe@freebsd.org" -- Bob Bishop rb@gid.co.uk
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