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#163683 - 05/14/07 02:42 PM has anybody tried this?
Niko Offline
Member
Registered: 08/17/06
Posts: 356
Loc: Campbell, CA
Hi Folks,
Do you know if a OC (occupancy sensor) can be in series with a dimmer.
Here is what i am proposing to do:
Install two lowvoltage recessed cans above a indoor jacuzzi tub, have a dimmer control them and to comply with title 24, have the OC control the dimmer.

Has anybody tried this?

Thanks for your input
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#163686 - 05/14/07 03:34 PM Re: has anybody tried this? [Re: Niko]
joncon Offline
Junior Member
Registered: 02/19/07
Posts: 20
Loc: Phoenix, AZ
As long as the OS is before the dimmer, no problem.
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#163687 - 05/14/07 03:37 PM Re: has anybody tried this? [Re: Niko]
ShockMe77 Offline
Member
Registered: 06/11/05
Posts: 821
Loc: Rahway, New Jersey
A guess:

If the occupancy sensor is rated for a particuliar voltage, then it will not be operating at it's rated voltage and therefore in violation of 110.3 (B).

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#163691 - 05/14/07 06:37 PM Re: has anybody tried this? [Re: Niko]
e57 Offline
Member
Registered: 05/27/03
Posts: 2876
Loc: S.F.,CA USA
I particularly like to use Meastro dimmers for this! They make a neat effect as they fade up to the pre-set if left on. (only using the VC to control it) With a few dimmers you can kind of make a 'scene' out of it when operating the "Vacancy Sensor", (Not 'occupancy sensor'!) and all the dimmers come up to preset levels.

Shockme, VC uses NC contacts, the dimmer gets the same voltage, you dont or should not dimm the VC.
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Mark Heller
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#163692 - 05/14/07 06:43 PM Re: has anybody tried this? [Re: e57]
e57 Offline
Member
Registered: 05/27/03
Posts: 2876
Loc: S.F.,CA USA
I think I want to dub that the "Poor-mans Grafik Eye"....
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Mark Heller
"Well - I oughta....." -Jackie Gleason
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#163701 - 05/15/07 06:02 AM Re: has anybody tried this? [Re: e57]
ghost307 Offline
Member
Registered: 05/09/05
Posts: 899
Loc: Chicago Illinois USA
Should I mention that you should check also to see if your Code allows lights above the tub before you get too far along?

I know that Chicago is dead set against it.
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#163717 - 05/15/07 11:00 AM Re: has anybody tried this? [Re: ghost307]
Zapped Offline
Member
Registered: 10/01/02
Posts: 482
Loc: Huntington Beach, CA, USA
I don't see any problem with this approach. As long as the sensor is BEFORE the dimmer, all components are getting proper operating voltage.

BTW, I did not know that about Chicago Ghost. Do they also not allow sealed-trim can lights above showers?
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#163718 - 05/15/07 12:03 PM Re: has anybody tried this? [Re: Zapped]
geoff in UK Offline
Member
Registered: 12/30/02
Posts: 179
Loc: UK
Depends if its the type of PIR occupancy sensor which has its own neutral, or the type which is in series with the line and relies on that to power it. The former will work; the latter not.
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#163719 - 05/15/07 12:29 PM Re: has anybody tried this? [Re: geoff in UK]
ghost307 Offline
Member
Registered: 05/09/05
Posts: 899
Loc: Chicago Illinois USA
The wording in the Code is similar to NEC for pendant lights, but there's a part that prohibits many of the light installations of this variety by a somewhat left-handed means. It limits the mounting height to no lower than a minimum of 7 ft 6 in. above the maximum water level. Even then they require a ground-fault circuit interrupter for it.

You can use recessed fixtures with a glass or plastic lens and nonmetallic or electrically isolated metal trim, suitable for use in damp locations or surface-mounted fixtures with a glass or plastic globe and a nonmetallic body or a metallic body isolated from contact if the fixtures are suitable for use in damp locations lower than the 7'-6 above the maximum water level if you provide a ground-fault circuit interrupter.

To paraphrase the Chicago Code; "sure it's okay...just jump through this moving hoop while whistling Dixie and juggling these oranges".

They're very accomodating here.
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#163722 - 05/15/07 02:49 PM Re: has anybody tried this? [Re: ghost307]
Niko Offline
Member
Registered: 08/17/06
Posts: 356
Loc: Campbell, CA
Thanks for all of your replies.

Mark, what is the difference between OS (occupancy sensor) and VS (vacancy Sensor)

Thanks
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