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NC-v4 EAp2:Minimum energy performance

ASHRAE 90.1-2010 Lighting Controls

Hi All,

I have a doubt regarding ASHRAE 90.1-2010 section 9.4.1.2a – “Space Control: The controlled lighting shall have at least one control step between 30% and 70% of full lighting power in addition to all off”.

So, should the manual control device have dimming control to meet requirement of additional control step between 30% to 70%.

Or alternatively, can the light fixtures in the space can be wired to control by 2 switches with only on/off control. Please clarify if this option meets the requirement of ASHRAE section 9.4.1.2a.

Thanks in Advance.

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Profile picture for user sheffer
Marcus Sheffer
LEED Fellow
7group / Energy Opportunities
LEEDuser Expert
4454 thumbs up

Tue, 04/09/2019 - 21:26

No this does not require dimming. A step is an incremental setting. This is often achieved by turning a portion of the fixture on and then the rest of the fixture on.  No it must be more than on/off.
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Ciaran McCabe
Director
Passive Dynamics Sustainability Consultants
LEEDuser Basic Member
12 thumbs up

Wed, 06/12/2019 - 12:01

Hi, I'm confused about the comment above. Would using two light switches comply as per the first comment above ? Therefore with only 1 bank of lights switched on the lighting would be at 50% of full output for the room.  
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Marcus Sheffer
LEED Fellow
7group / Energy Opportunities
LEEDuser Expert
4454 thumbs up

Wed, 06/12/2019 - 12:32

Yes I think so.  I see your confusion. When i said it must be on/off I was assuming all the lights were controlled by one switch.

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