Path: ...!3.eu.feeder.erje.net!feeder.erje.net!weretis.net!feeder8.news.weretis.net!fu-berlin.de!uni-berlin.de!individual.net!not-for-mail
From: Chris Green <cl@isbd.net>
Newsgroups: comp.sys.raspberry-pi
Subject: Re: Seeking cable management ideas....
Date: Mon, 17 Jun 2024 08:44:59 +0100
Lines: 40
Message-ID: <r465kk-sid1.ln1@q957.zbmc.eu>
References: <v4av7p$1emoc$1@dont-email.me> <slrnv6k26u.ibi.andrews@sdf.org> <v4hk0a$2u2ug$1@dont-email.me> <v4kue4$mr2$1@tncsrv09.home.tnetconsulting.net> <8ok2kk-ja31.ln1@q957.zbmc.eu> <v4ntm1$93on$2@dont-email.me>
Mime-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
X-Trace: individual.net h5KzCMclPBCnrRrOvNxPVAWVDoeRhJNoAMWoVJ9qthoxYhxg8=
X-Orig-Path: not-for-mail
Cancel-Lock: sha1:WtkRkw3yuIwMB3T4ieW1yjnfwcI= sha256:rZHjKhHAtWUvcj8L9fxM/mjQSfIa9TTQ2CI1++3ctuM=
User-Agent: tin/2.6.4-20240224 ("Banff") (Linux/6.8.0-35-generic (x86_64))
Bytes: 2958

bp@www.zefox.net wrote:
> Chris Green <cl@isbd.net> wrote:
> > Grant Taylor <gtaylor@tnetconsulting.net> wrote:
> >> On 6/14/24 09:27, bp@www.zefox.net wrote:
> >> > One approach that sort-of works is to plug two walwarts (one for the 
> >> > Pi, one for the hub) into a single 3-outlet extension cord, then coil 
> >> > the excess wire (both mains and 5-volt) around the cleat- like object 
> >> > which results and hold it in place by a cable tie or split conduit. 
> >> > I've done a couple like this and it's ugly but better than loose 
> >> > wires. One can at least see where each Pi plugs in.
> >> 
> >> I would be careful -> avoid coiling low voltage with high voltage mains. 
> >>  My concern is that you would end up with something akin to a (poor) 
> >> transformer of sorts.  Wherein the high voltage mains would couple onto 
> >> the low voltage lines.  At a 1:1 ratio, you'd end up with the same high 
> >> voltage on the low voltage secondary side.
> >> 
> >> I don't know how many loops on a coil would be needed for this to be 
> >> noticeable.
> >> 
> > Without an iron core of some sort I doubt if there's much risk.
> > However wiring regulations require that mains carrying cables should
> > be either 50mm away from low voltage ones or that there should be
> > 'mechanical separation' between mains and low voltage wiring. (That's
> > the basics anyway).
> > 
> 
> I hadn't considered electrical codes 8-) I suspect that very few
> computer setups in homes observe a 50 mm separation rule, at
> least here in the US. Still a picky inspector might take issue.
> 
I'm quoting UK codes of course.  I *think* mechanical separation would
be satisfied by an extra layer of sleeving over the actual wires
carrying the mains voltage.  It is now a requirement in the UK (and EU
I believe) that all mains leads are sheathed, you can't use the
'figure of eight' twin flex that used to be quite common.

-- 
Chris Green
·