Cracking the IECC 2021

摘要

Regarding lighting, the 2021 version of the IECC reduces lighting power allowances, expands mandatory controls requirements and issues clarifications. The most significant changes from the 2018 IECC are tighter interior lighting power allowances and the addition of daylight-responsive control for secondary daylight zones, plug load controls and parking garage control requirements. Let's take a look at some of the other big changes. Lighting power allowances: IECC 2021 generally reduces interior lighting power allowances. (All measurements are in watts per square foot.) Looking at the building area method, interior lighting power is reduced from 0.79 to 0.64 for office, 1.06 to 0.84 for retail, 0.81 to 0.72 for school/university and 0.48 to 0.45 for warehouse buildings. The steady decline in allowances recognizes the growing maturity of LED technology.