From owner-freebsd-stable@freebsd.org Thu May 2 21:17:49 2019 Return-Path: Delivered-To: freebsd-stable@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id B67AA15A1894 for ; Thu, 2 May 2019 21:17:49 +0000 (UTC) (envelope-from rb@gid.co.uk) Received: from mx0.gid.co.uk (mx0.gid.co.uk [194.32.164.250]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id 84888724D8 for ; Thu, 2 May 2019 21:17:38 +0000 (UTC) (envelope-from rb@gid.co.uk) Received: from [194.32.164.30] ([194.32.164.30]) by mx0.gid.co.uk (8.14.2/8.14.2) with ESMTP id x42LHUKE066216; Thu, 2 May 2019 22:17:30 +0100 (BST) (envelope-from rb@gid.co.uk) Content-Type: text/plain; charset=utf-8 Mime-Version: 1.0 (Mac OS X Mail 10.3 \(3273\)) Subject: Re: ZFS... From: Bob Bishop In-Reply-To: <201905021817.x42IHG7U052982@fire.js.berklix.net> Date: Thu, 2 May 2019 22:17:30 +0100 Cc: "N.J. Mann" , freebsd-stable , Michelle Sullivan Content-Transfer-Encoding: quoted-printable Message-Id: References: <201905021817.x42IHG7U052982@fire.js.berklix.net> To: "Julian H. Stacey" X-Mailer: Apple Mail (2.3273) X-Rspamd-Queue-Id: 84888724D8 X-Spamd-Bar: -- Authentication-Results: mx1.freebsd.org; spf=pass (mx1.freebsd.org: domain of rb@gid.co.uk designates 194.32.164.250 as permitted sender) smtp.mailfrom=rb@gid.co.uk X-Spamd-Result: default: False [-2.84 / 15.00]; MX_INVALID(0.50)[greylisted]; R_SPF_ALLOW(-0.20)[+mx]; MV_CASE(0.50)[]; TO_DN_ALL(0.00)[]; NEURAL_HAM_SHORT(-0.92)[-0.917,0]; SUBJ_ALL_CAPS(0.45)[6]; FROM_EQ_ENVFROM(0.00)[]; R_DKIM_NA(0.00)[]; MIME_TRACE(0.00)[0:+]; ASN(0.00)[asn:42831, ipnet:194.32.164.0/24, country:GB]; MID_RHS_MATCH_FROM(0.00)[]; ARC_NA(0.00)[]; NEURAL_HAM_MEDIUM(-0.99)[-0.988,0]; FROM_HAS_DN(0.00)[]; RCPT_COUNT_THREE(0.00)[4]; NEURAL_HAM_LONG(-1.00)[-1.000,0]; MIME_GOOD(-0.10)[text/plain]; RCVD_TLS_LAST(0.00)[]; DMARC_NA(0.00)[gid.co.uk]; TO_MATCH_ENVRCPT_SOME(0.00)[]; RCVD_IN_DNSWL_NONE(0.00)[250.164.32.194.list.dnswl.org : 127.0.10.0]; IP_SCORE(-1.09)[ip: (-3.09), ipnet: 194.32.164.0/24(-1.55), asn: 42831(-0.72), country: GB(-0.09)]; RCVD_COUNT_TWO(0.00)[2] X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 02 May 2019 21:17:49 -0000 Hi, > On 2 May 2019, at 19:17, Julian H. Stacey wrote: >=20 > Hi, Reference: >> From: "N.J. Mann" >> 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 = 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