Date: Thu, 02 May 2019 20:17:16 +0200 From: "Julian H. Stacey" <jhs@berklix.com> To: "N.J. Mann" <njm@njm.me.uk> Cc: Michelle Sullivan <michelle@sorbs.net>, freebsd-stable <freebsd-stable@freebsd.org> Subject: Re: ZFS... Message-ID: <201905021817.x42IHG7U052982@fire.js.berklix.net> In-Reply-To: Your message "Thu, 02 May 2019 18:18:16 %2B0100." <5D9EAA497C84C50D0DAA5491@triton.njm.me.uk>
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Hi, Reference: > From: "N.J. Mann" <njm@njm.me.uk> > Date: Thu, 02 May 2019 18:18:16 +0100 "N.J. Mann" wrote: > Hi, > > > 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. > >>> > >> Bottom lines on the power pole are normal 240/415 .. top lines are the 11KV distribution network. > > > > Oh and just so you know, it’s sorta impossible to get 415 down a 240v connection > > No it is not. As I said, if two phases come into contact you can have 415v between > live and neutral. With 3 phase: - 415 between each of the 3 live phases - 240 between neutral & the 3 live phases (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 ) PS UK/Britain was nominal 240V, but EU inc UK is now nominal 230V +10%/-6% https://en.wikipedia.org/wiki/Mains_electricity#Standardisation Cheers, Julian -- 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.
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