Page 183 - Solar Power in Building Design The Engineer's Complete Design Resource

COMPUTERIZED LIGHTING CONTROL 153

Figure 6.3 DMX relay lighting control wiring plan. Photo courtesy of LCD.

devices via category 5 patch cables and RJ45 connectors. Figure 6.5 depicts a cen-
tralized dimming circuit diagram.
The preceding systems also include smart breaker panels that use solenoid-operated
thermal magnetic breakers that effectively provide overcurrent protection as well as
lighting control. Overcurrent devices are usually available as single- or three-phase;
with a current rating of 15, 20, and 30 A; and with an arc current interrupt capacity
(AIC) of 14 kiloamperes (kA) @ 120/208 V and 65kA @ 277/480 V.
A microprocessor-based, current-limiting subbranch distribution panel provides
lighting calculations for most energy regulated codes. For example, California’s Title
24 energy compliance requirements dictate 45 W of linear power for track lighting,
while the city of Seattle in the state of Washington requires 70 W/ft for the same track
lighting system. The current limiting subpanel effectively provides a programmable
circuit current-limiting capability that lowers or raises the voltampere (VA) rating
requirement for track lighting circuits. The current-limiting capacity for a typical