Re: Re: Alarm wiring

["Alancc" <alan.cc@xxxxxxx>]

Tim

If you have used unscreened cable then its good practice to earth the
unused
cores, if not they can act as an ariel inducing interference into the used
cores.
If the cable is screened you must earth the screen keeping the tails as
short as possible inside the panel, don't forget to keep the earthing
continuous when passing through a detector or joint.

Alancc
----- Original Message -----
From: Hawes,Timothy Edward (GEG) <haweste@xxxxxxx>
To: <ukha_d@xxxxxxx>
Sent: Wednesday, March 12, 2003 7:47 AM
Subject: RE: [ukha_d] Re: Alarm wiring


> David,
>
> Thanks for the reply. I've cabled using 6-core exclusively, so I'll
just
tape up the unused cores where not required.
>
> Tim H.
>
> > -----Original Message-----
> > From: the_home_automator
> >
> > I assume you are talking about ordinary four and six core alarm
cable.
> >
> > There is no official standard for what colours should be used for
> > wat.  Furthermore, the cores are not twisted, so there are no
natural
> > pairs, unlike cat5 for example.
> >
> > So you are free to pick any colour to make your pairs you like.
> >
> > Advice: be consistent in your use of cores throught your alarm. 
This
> > is easy for four core ensors, but gets more contentious when you
get
> > to six core for PIRs, as black and red (the natural colur for the
12v
> > feed) is also present in the four core cable.  So the12v feed is
not
> > usually on red/black.
> >
> > As long as you are consistent, it is reasonably obvious within a
few
> > seconds of opening a panel what the colour scheme is, so there
are no
> > real problems with future (and next owner) support.
> >
> > David.




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