they want a master switch for all of the lighting on the mezzenine level
Would this be the "Override/Bypass" control for the Automatic / Timed interior lighting shut-off control, per CEC Title 24, Part 6?
(time clock driven control shuts off lights during non-business hours, override is 2 hour auto reset).
If yes, the override switch must be located so the area controlled is in sight, and each Zone to have independent overrides (Zone = 5K Feet²
The intention would be to allow cleaning personnel to turn on lighting per Zone needed, and to be able to override (find the switch and activate it) at the access point(s) of the controlled Zone.
These items are covered and described in the Non Residential Manual
of the California Energy Commission's Conservations Standards - AKA "Title 24, Part 6".
The linked file above is kind of large - as it includes Compliance targets for "Envelope" & HVAC, Tables and examples, descriptions and examples, blank compliance forms, as well as the "Lighting" Compliance targets we as Electricians deal with.
The file is a .PDF, so need Acrobat Reader (at least), to view.
The linked file is used by the Lighting System Design Person (EE, Designing Person, EC, or Architect) for minimum Compliance goals, and is what the Lighting Plan will reflect as far as maximum lighting power, room controls, bi-level ("A/B") switching, Building Automatic "Off" controls, and controls for Exterior Lighting.
Use it quite often for the projects I design.
BTW, I would encourage anyone involved with Commercial Projects in California to read the Standards Manual, as it will answer the questions of "Why are there so many strange Lighting Controls on this Plan" and similar ones regarding Lighting Control techniques ("A/B" switching is a common one!).
they have switches all over the place in every area of an open office area. Talk about confusing! I asked the Arch' breifly about it, (Just so happens it is thier office too!) and they had no clue of what I was talking about.
Funny thing about when you asked the Tenant this - and the Tenant being an Architectural Firm, is they rarely deal with the Lighting System Designs, and therefore are usually unaware of the overall design scenario you were referring to.
They - of course - design the Lighting Fixture Layout
, and then Contract an EE Firm for Electrical Systems Design.
The Electrical Engineering Firm will "attemp"t to make the design work, along with design the required controls, perform the calculations and attach the required data/sheets to the Planset.
As to the EE's "attempt" to make the designed lighting layout work, normally the Architects will have more Fixtures designed in than are allowed per Watts/ Ft² Calculations (basic General Office Space = 1.2 Watts / Ft²... but there's ways to adjust and tweak), so the EE "Attempts" to make things work via controls, adjustments and credits.
This is one reason why the RCP has a different Fixture count than the Lighting Plan of the "E" Sheets.
Lastly, the reasoning behind having a Gazillion lighting switches everywhere is to allow for manual lighting power reduction.
This is covered in the Standards Manual.
edited to fix an accidental smilee!
[This message has been edited by Scott35 (edited 10-22-2004).]