According to ASHRAE 90.1 / Section 9.4.1.2 , Do we have to install occupant sensor or a timer switch in electrical and mechanical rooms?
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Marcus Sheffer
LEED Fellow7group / Energy Opportunities
LEEDuser Expert
5906 thumbs up
November 1, 2022 - 4:12 pm
No they are listed among the exceptions to section 9.4.1.2a.
Sara BENLOUBA
Green building managerConfidential
13 thumbs up
November 2, 2022 - 4:21 am
Thanks very much Marcus.
Mechanical /technical rooms arent listed among this exceptions. So, this rooms are concerned by occupant sensors or not?
Marcus Sheffer
LEED Fellow7group / Energy Opportunities
LEEDuser Expert
5906 thumbs up
November 2, 2022 - 9:32 am
The copy of the standard that I have reads as follows:
Exceptions to 9.4.1.2a:
a. Lights in corridors, electrical/mechanical rooms, public lobbies, restrooms, stairways, and storage rooms.
Reading further. Section 9.4.1.2b lists the spaces where occupancy sensors or a timer switch are required and electrical/mechanical rooms are not on the list. You then go to Section 9.4.1.2c which states that a control device can be manual (i.e. a light switch). Therefore such automatic controls are not required in electrical/mechanical rooms.