Crestron Commercial Lighting Design Guide | Specifying a Lighting System |
Specifying a Lighting System
The Load Schedule
A lighting system design begins with a collection of complete information. This includes a detailed floor plan identifying all of the required elements. The first element of design, the load schedule, is developed from the floor plan. The load schedule lists the information on each electrical load connected to every circuit in an electrical panel. This primary source of information determines all of the overall requirements:
Lighting types, required voltage and current, dimmed or switched, fluorescent ballast types, circuit number, normal or emergency, and locations
The location and types of user interfaces used (i.e., dimmers, switches, keypads, iLux™, infiNET™, and touchpanels)
The control processor details (larger systems should use a dedicated lighting control processor)
The window treatment details, which include shade/blind motors and relay control (consult the window treatment manufacturer for control details).
Required Load Schedule Items
1.Control zone: Controlled circuits that do not need to be physically wired together, but always operate in tandem. For example, perimeter lights, sconce lights and overhead lights all operating together
2.Location of controlled lighting zone, relevant to building site/drawings, floor designation, and room name
3.Fixture and/or lamp type of controlled lighting zone, including any information describing custom fixtures, undetermined fixtures, dimmable transformers or fluorescent ballasts, and circuit breaker numbers. This information can also contain the number assigned to the controlled circuit
4.Load type of the controlled lighting zone: load types include incandescent, magnetic low voltage, electronic low voltage, neon/cold cathode, HID,
information is especially important for selecting the correct Crestron module power rating and type
5.Dimming requirement for the controlled lighting zone (i.e. whether the lighting level of the loads/fixtures needs to be ramped up/down or simply switched on/off). Indicate: “Yes” for Dimming, and “No” for
6.Emergency designation for the controlled lighting zone (yes/no; i.e. when a load needs to be assigned to a separate emergency power feed). These items are assigned to their own separate dimmer, so they can be fed with emergency power
7.Voltage rating for the controlled lighting zone tells the designer the voltage of the electrical feeds required for that zone, and hence the required rating for the associated Crestron module.
8.Fixture wattage (watts or power rating per fixture) with regard to the controlled lighting zone: this is used to determine the number of fixtures that can be powered per each Crestron Dimmer Module channel, in order not to overload the dimmer beyond its power rating
9.Quantity of fixtures for the controlled lighting zone: this is useful, along with item #6, in calculating the total power rating (watts) for that particular controlled circuit (item #9)
10.Total wattage, or power rating, of the controlled lighting zone: This is required in order to determine the total number of Crestron Lighting Module channels required for that particular zone, especially if the load of the total number of fixtures exceeds the rating of a single module channel
A riser diagram is requied for commercial lighting projects. The simgle lin or sier diagram indicates system components connected to individual circuits in the system. Components connected to a common circuit are shown as being connected to a single line, regardless of the number of conductors actually used. The number of conductors in each wiring segment is usually indicated by right angle marks across the single line at that point or by other appropriate means
NOTE: National and local electrical codes and the functionality of each user interface must be taken into consideration. Always install electrical devices according to the national Electrical Code (NEC), local codes, and with safety in mind.
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