Re: CBus introductory course

["Frank Mc Alinden" <fmcalind@xxxxxxx>]

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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