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

["noel_pilot" <HA@xxxxxxxxxxxxxxxxxx>]

I've since realised it's much better to take the Live feed from the
existing switch and run that through the PIR, timer and dimmer (also
using it to power the PIR and timer) and pass back to the switched
live on the light.

Much simpler and more effective.  Can also just use Neutral from the
light fitting to provide neutral to PIR and timer.

Will post proper diagrams once completed, all being well!

--- In ukha_d@xxxxxxx, "noel_pilot" <HA@...> wrote:
>
> 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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