ASHRAE 90.1 control requirements

greenspark1

Senior Member
Location
New England
Hello,
I'm reading through section 9 of ASHRAE 90.1-2010 and it has some peculiar requirements I've never seen before.

9.4.1.2 requires all spaces to have at least one control step between 30 & 70% of full light power. I've never designed to this, nor seen it in other's designs.

9.4.1 requires all automatic-on lights to turn on to not more than 50% of light power (with a couple of exceptions). Again, this is not something I've ever seen. All the occupancy sensors I've seen are full on or off.

I also don't see an allowance for lights on 24/7 but any store I drive by has lights on inside and in the lobby that never turn off. What gives?

Am I missing a common exception? I've never seen a space designed to these requirements. Thanks for insight!
 
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