Re: CBus introductory course

["Paul Robinson" <ukcueman@xxxxxxx>]

Hi Frank,

I've already run most of my cable. Just the largest room yet to do (which
is
directly below node zero). My cbus cat5 is star wired, and most cables
taking a single switch. A couple will take two switches. So most of these
cables will only have 18mA. But these are all bunched with other cbus stuff
and other cat5. I was just trying to get a feel for how concerned I should
be and whether I should try and do anything about the separation now (which
would be painful enough that I'd rather not do it).

Your view and Keith's are quite clear though!

Paul

----- Original Message -----
From: "Frank Mc Alinden" <fmcalind@xxxxxxx>
To: <ukha_d@xxxxxxx>
Sent: Wednesday, June 11, 2003 9:11 PM
Subject: Re: [ukha_d] CBus introductory course


> Hi Paul
>         the higher the current the greater the inductance would be
...so i
believe its better to split your C_Bus circuit ie upstairs on one leg and
down stairs on another....
>
> >I was also wondering about the problems with mixing >cbus
cables with
> >LAN/phone/Kat5 etc. Niall is strongly opposed to >this - not
for what it
will
> >do to cbus, but for what the cbus currents might do >to data
cables.
>
> I have run my c_bus along other cat5,s with no problems..but my runs
are
short...If he suggests keeping a space between C_Bus and others well do the
best you can .....Do you honestly think when guys are installing cat5,s in
multi storey building the stick to the rules ??? I doubt it very much and
they are noisy and inductive installations .......
>
> Frank
>
>
>
>
> Have you run cbus cat5 next to data cat5?
>
>   ----- Original Message -----
>   From: Paul Robinson
>   To: ukha_d@xxxxxxx
>   Sent: Thursday, June 12, 2003 6:01 AM
>   Subject: Re: [ukha_d] CBus introductory course
>
>
>   Frank,
>
>   I know you can daisy chain or star wire, but I was wondering whether
this
>   affected any cross-cable inductance problems. In other words, if you
>   star-wire and have 14 cat5 cables each running 18mA, will this
produce
more,
>   less or the same interference as 1 cat5 carrying 14*18mA.
>
>   I was also wondering about the problems with mixing cbus cables with
>   LAN/phone/Kat5 etc. Niall is strongly opposed to this - not for what
it
will
>   do to cbus, but for what the cbus currents might do to data cables.
>
>   Have you run cbus cat5 next to data cat5?
>
>   Paul
>
>   ----- Original Message -----
>   From: "Frank Mc Alinden" <fmcalind@xxxxxxx>
>   To: <ukha_d@xxxxxxx>
>   Sent: Wednesday, June 11, 2003 8:53 PM
>   Subject: Re: [ukha_d] CBus introductory course
>
>
>   > Hi Paul
>   >
>   > >CBus runs (supposedly) at 36V DC but in practice >will
run at around
30V
>   > >(ish). Cbus units will happily work down to 15V, >and if
units are
added
>   in
>   > >series, the voltage will drop. Most units use 18mA. >In
my case, I
will
>   use
>   > >14 switches and an (at present) unknown number of >PIRs,
>   light/temperature
>   > >sensors etc. This means my switches (alone) will >draw
about 14*18 =
>   252mA.
>   >
>   > I think you mean if conected in parallel  rather than series..I
have
ATM
>   10 units on the bus and if i connect another couple the C_Bus light
on
the
>   pc interface starts flashing to indicate bus power getting low (i
think)...I
>   still require another dimmer so i will get one *with* a power supply
and
>   that should fix it....Use seperate runs for upstairs and downstairs
to
split
>   the load on the cat5 that should help... i think the cat5 is rated
around
>   300mA.......
>   >
>   > You can daisy chain or star wire .....
>   >
>   > HTH
>   >
>   > Frank
>   >
>   >
>   > [Non-text portions of this message have been removed]
>   >
>   >
>   >
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