Re: Bathroom project - Cbus style lighting system....1 room only though!!

["noel_pilot" <HA@xxxxxxxxxxxxxxxxxx>]

Hi all,
Just a few months later I'm actually in the process of completing this
(with pics of course!)

I've got all the kit and just trying to sort the wiring in my head.
Want to be absolutely sure I've got this right! Have an electrician
that will inspect afterwards but doing the rest myself.

Might post diagrams later if needed but hopefully someone can help
based on the text for now.

At the moment I have a light, a switch, an extractor fan and a
extractor fan isolation switch.  The light and the switch are wired
through the extractor fan isolation switch, presumably to trigger the
fan to come etc but also wired such as to allow the light to still
come on even when the fan is isolated to off.

So I'm looking to create another circuit that will switch the light on
from the PIR, timer and dimmer switch.

I'm planning on tapping into the feed from the extractor fan isolation
switch to the light and running the new circuit in parallel with that
point, if I've got this right that means at night when the PIR is
triggered then the light will come on but without the fan coming on,
the fan will only be triggered by the original light switch.

So currently going to the light will be a Neutral (assumed to link
through a ceiling rose at the extractor fan switch to both the
previous and the next light in the lighting ring) and a switched live
from the extractor fan isolation switch/light switch.

Should I tap into that and use the neutral that's already there and
just pass the switched live through the PIR, timer and dimmer, then
completing the circuit when those are triggered or should I be running
the same neutral that's coming into the PIR running that to the point
where I tap into the light and completing the parallel circuit with
the switched live out of my new circuit?  Or does it not matter?

I'm thinking that the second option is the best and it simplifies the
circuit a little bit.

Can someone also clarify the implication of what happens if both
circuits are live at once?  I assume that the light switch will allow
more 'current?' to run through as it won't have a dimmer switch in the
circuit therefore the lights will come on full brightness but can
someone confirm there's no issue with having the circuit completed
twice as it were?

I'm going to try and get hold of my electrician today to talk it
through also but I value the experience on here of things outside the
norm so hope someone can confirm my thoughts and ideas!!

Cheers all

Noel

--- In ukha_d@xxxxxxx, Neil Fuller <neil.fuller@...> wrote:
>
> Done off list
>
> noel_pilot wrote:
> >
> > Thanks Neil, that URL doesn't work though, could you send me your
> > original link? Thanks
> > Noel
> >
> > --- In ukha_d@xxxxxxx <mailto:ukha_d%40yahoogroups.com>,
Neil
> > Fuller <neil.fuller@> wrote:
> > >
> > > Noel
> > >
> > > What about a timer with volt free contacts.
> > >
> > > The timers clock would be powered from a permanent power
supply
and the
> > > supply to the light fitting switched via the VFC.
> > >
> > > There's loads of them available and if you shop around,
you'll find
> > > something cheaper than this . . . .
> > >
> > > http://tinyurl.com/7w5t2l <http://tinyurl.com/7w5t2l>
> > >
> > > I've sent you a data sheet off list which details the
electrical
> > > connections.
> > >
> > > HTH
> > >
> > > Regards
> > >
> > > Neil
> > >
> > > noel_pilot wrote:
> > > >
> > > > Hi Stephen,
> > > > Thanks for that, I think the power supply option is
going to
be easier
> > > > for me, i already have a 5A socket in the loft I was
using for
a tv
> > > > amplifier so can use that to simply run. Nice one many
thanks.
> > > >
> > > > Noel
> > > >
> > > > --- In ukha_d@xxxxxxx <mailto:ukha_d%40yahoogroups.com>
> > <mailto:ukha_d%40yahoogroups.com>,
> > > > Stephen McGarry <Selfbuild@> wrote:
> > > > >
> > > > > power the PIR and timer in paralell the use the
output of
the PIR to
> > > > activate a relay with the contacts in series after
> > > > > the timer. Thus PIR stays powered and doesnt do
the 'turn on
thing'.
> > > > Alternately use as small power supply to replace
> > > > > the battery in the timer.
> > > > >
> > > > > HTH
> > > > > Stephen
> > > > >
> > > > > noel_pilot wrote:
> > > > > >
> > > > > >
> > > > > > Hi all,
> > > > > >
> > > > > > It's Christmas day, I've got a small stash of
money to let
me get
> > > > > > cracking on my bathroom so I'm looking to
order my stuff! :)
> > this goes
> > > > > > nicely with my chilled eve, wine and royle
family!!
> > > > > >
> > > > > > one question on this, ideally i'd put the PIR
before the timer
> > that
> > > > > > way the light wont turn on when the powers
supplied each
> > evening as it
> > > > > > would if the timer was in front of the PIR.
> > > > > >
> > > > > > Only problem with this is that the timer then
doesn't have any
> > power
> > > > > > to it to power the timer!!! Now I know a few
have battery
> > backup but
> > > > > > this means that the timers going to be
running on battery
> > backup near
> > > > > > enough permanently! something like http://tinyurl.com/a6xgze
> > <http://tinyurl.com/a6xgze>
> > > > <http://tinyurl.com/a6xgze <http://tinyurl.com/a6xgze>>
> > > > > > <http://tinyurl.com/a6xgze <http://tinyurl.com/a6xgze>
> > <http://tinyurl.com/a6xgze <http://tinyurl.com/a6xgze>>>
the only
> > > > > > time it would actually have mains power would
be during
the brief
> > > > > > periods that someone uses the bathroom
between 2200 and 0600.
> > > > > >
> > > > > > Has anyone used any mains timers
predominantly on battery
backup??
> > > > > > Some of the other timers on sites i've looked
at get slated,
> > this one
> > > > > > slightly less so than others.
> > > > > >
> > > > > > Any advice all??! Thanks
> > > > > >
> > > > > > Noel
> > > > > > Happy Christmas,
> > > > > >
> > > > > >
> > > > >
> > > >
> > > >
> > >
> >
> >
>




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