Re: Cabling Question

["Tony T" <home@xxxxxxx>]

Hi Keith,

thanks for that info, do you know of anything I could use to shield the
5v
cable? or is the whole idea a non-starter?

I can make do without the ir receivers going down the wall, but I'd
really
like to have the switches.
A 5v cable switch attached to a VIOM module attached to the ha PC is
going
to control the AD10/LD11 lights (thereby giving me a known status of
the
lights when operated manually).
The 240v switch is a backup to give manual control of the units if the
ha
system fails (and probably required to comply to some regulation or
other?).

Many thanks
Tony T

----- Original Message -----
From: "Keith Doxey" <lists.diyha@xxxxxxx>
To: <ukha_d@xxxxxxx>
Sent: Saturday, May 04, 2002 12:58 PM
Subject: RE: [ukha_d] Cabling Question


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
>
>
>
> For more information: http://www.automatedhome.co.uk
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>
>



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