RE: Cabling Question

[Steve B <steve@xxxxxxx>]

Keith,

How likely are problems in a domestic situation ?

In a retro fit to an old house you often want to keep disturbance to a 
minimum and often there is only one route to go. One hole or holes side by
side etc. I have many cables parallel for say 20m and have found no 
problems YET :-)





At 12:58 04/05/2002 +0100, you wrote:
>BZZZZT !!!!
>
>WRONG !!!! Sorry Simon.
>
>Running cables in PARALLEL is EXACTLY when induction occurs. All
cabling
>guides tell you to avoid running cables in parallel when they are
carrying
>signals that are likely to either suffer or cause interference eg.
>Low level audio and data circuits SUFFER inteference
>High Current mains cables can CAUSE interference.
>
>Where cable cannot be physically separated you should CROSS at 90
degrees to
>minimise any induction.
>
>In reality most mains cables dont cause too much of a problem as they
have
>both Live and Neutral in the same sheath carrying equal currents.
These
>generate equal but opposite interference fields which cancel each other
out
>once you get a inch or so away.
>
>To comply with IEE wiring regulations you SHOULD have a physical
barrier eg
>Trunking between Low and High voltage circuits but that is for SAFETY
not
>interference rejection. Good wiring practice should aim to make the
physical
>separation as great as possible to minimise any possible
interference.
>
>Keith
>
>www.diyha.co.uk
>www.kat5.tv
>
>
>-----Original Message-----
>From: Simon Coates [mailto:ecolume@xxxxxxx]
>Sent: 04 May 2002 11:20
>To: ukha_d@xxxxxxx
>Subject: Re: [ukha_d] Cabling Question
>
>
>Cables running parallel to each other shouldn't induce voltage -
induction
>happens when wires cross.  Shouldn't be a problem for basic
switching but
>induced noise can cause problems with IR circuits.  Try and keep
any mains
>and LV cables at least 50mm apart.
>
>Simon
>
>----- Original Message -----
>From: Tony T <home@xxxxxxx>
>To: <ukha_d@xxxxxxx>
>Sent: 04 May 2002 10:28
>Subject: [ukha_d] Cabling Question
>
>
> > Hi All,
> >
> > please excuse my ignorance on cabling, but I was wondering if
anyone could
> > tell me if running a 5v DC cable alongside a 240v AC cable
(lights) could
> > cause any undesirable voltage induction(?) into the DC line. Both
are to
>be
> > used for switches, with a possible 3rd cable being run alongside
for IR.
> >
> > P.S. have a great time at the meet all those who are going, wish
I could
>be
> > there...
> >
> > Many thanks
> > Tony T
> >
> >
> >
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>
>
>
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