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 Newsgroups: comp.sys.raspberry-pi Subject: Re: Seeking cable management ideas.... Date: Mon, 17 Jun 2024 08:44:59 +0100 Lines: 40 Message-ID: References: <8ok2kk-ja31.ln1@q957.zbmc.eu> 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 wrote: > > Grant Taylor 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 ยท