In 2015 IECC, the same open office space in Figure 1 would be able to be controlled with just two zones utilizing nothing more than two relays in a relay panel and a photocell for the single daylight zone with an override switch for no more than every 5,000sqft. The below diagram (Figure 1) shows how zoning of an open office of 1,800sqft with windows on one wall would look like under the 2021 IECC requirements. If using time-of-day, no more than 5,000sqft can be controlled together and must be provided with an override switch for the occupants to turn the receptacles on after hours for no more than two hours.Automatic off either with occupancy sensors following the same time-out settings as lighting (no more than 20 minutes) or via time-of-day schedule to be shut off at the end of the day.25% of all receptacles installed in modular furniture (cubicles) must be automatically shut off.Occupancy sensors take precedence over daylight sensors, meaning that if a zone is unoccupied, lighting must not exceed 20% output in either the non-daylight or daylight zones even if the daylight sensor is set to maintain a higher output for the space than the 20% light level.Īutomatic Receptacle Control Requirements. ![]()
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