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   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   
   ·   
      
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