Re: DIN Enclosure for CBus modules

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

Hi Gareth


> No-one seems to have the same setup - and there's me thinking
electrical
> regs were fixed !

Theres more than one way to do any job.....I have my cbus units in a metal
housing , but i have also installed cbus kit into Clipsal plastic
housings......
My install was a retrofit and all my dimmer channels are on the same
lighting circuit....

The other install was a new home with  4 dimmer units and 2 relay units
each
unit had its own rcb/mcb 10A circuit breaker ....The neutral bar had
removable links so each Dimmer had its own small neutral bar .....

HTH
Frank


If you can source the "B" curve circuit breakers  i would use
them to
protect your dimmer channels .....





----- Original Message -----
From: "Gareth Cook" <g@xxxxxxx>
To: <ukha_d@xxxxxxx>
Sent: Sunday, April 10, 2005 5:51 PM
Subject: Fw: [ukha_d] DIN Enclosure for CBus modules


>
> Gah ! More confused !
>
> No-one seems to have the same setup - and there's me thinking
electrical
> regs were fixed ! So I'm still not there on what I need to do yet on
> providing the electricals to the CBus cabinet - AND which cabinet :-(
>
> G.
>
>  Gareth Cook
>  SWG EMEA North Account Manager
>  IBM SWG - BTE Office - Lotus Park, Staines, TW18 3AG
>  Office: +44 (0)1784 445166 - Mobile: +44 (0)7980 445166
>  AIM Chat : TheBoyG - MSN Chat : chat@xxxxxxx
>  email: g@xxxxxxx
>
>
> ----- Forwarded by Gareth Cook/UK/IBM on 10/04/2005 08:35 -----
>
> Discussion
> Main Topic
>
> "Paul Robinson" <ukcueman@xxxxxxx>
> Today 03:11
>
> .
> Subject:
> .
> Re: [ukha_d] DIN Enclosure for CBus modules
> .
> Category:
>
>
>
>
> >
> > Hi Paul
> >             Wouldnt be too keen on using plywood ,as its not fire
rated
> > ??.....Usually these panels have an internal metal
plate............
> Will check on that....
>
> > Here in Oz  i havent heard of anyone using c/b,s on the load
> side.....Have
> > you had any trips on yours when a bulb pops ???...I would imagine
the
> c/b
> > would be too slow to react....
> Short answer: yes.
>
> Longer answer....
>
> I have an incoming supply that goes to my consumer unit. There is one
32A
> MCB feeding my
> main CBus boxes. There, it goes into two 16A MCBs (because my dimmers
are
> split across two
> boxes).
>
> Each of those 2 16A MCBs feed 3 or 4 dimmers, protected by a 10A MCB
per
> dimmer on the
> input side and a 6A MCB per channel on the output side. Ideally it
would
> have been 1A on
> the output side, but this was much cheaper.
>
> That means electricity must pass through the following route:
> 32AMCB --> 16A MCB --> 10A MCB --> dimmer --> 6A MCB
--> light
>
> When I first set this up all MCBs were of the same type and same
> manufacturer. A main
> halogen blowing would trip the last three MCBs - so I would lose half
my
> lights. This
> happened on three separate occasions.
>
> I then changed the 16A MCBs from 'B' type to 'C' type, so they react
more
> slowly. Now when
> a halogen blows, it trips only the 10A and 6A MCBs - so I lose power
to
> one dimmer.
>
> In this scenario, I'm not sure that the 6A MCBs are actually doing any
> significant work in
> protecting the dimmers because the MCBs on both sides blow anyway.
>
> However, having had a shock from dimmers that have been turned off
> (there's a good reason
> there's a sticker on them to say the load side isn't isolated when
turned
> off), I really
> like the idea that I can isolate a light if I want to, as Li says.
>
> Paul
>
>
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