ASHRAE-90.1-2022- - Page 152

Extracted Content

c. Section 9.4, “Mandatory Provisions,” and Section 9.5.2, “Space-by-Space Method Compliance Path” or d. Section 9.4, “Mandatory Provisions,” and Section 9.6 “Alternative Compliance Path,” or e. Section 9.4, “Mandatory Provisions,” and Section 12, “Energy Cost Budget Method,” or f. Section 9.4, “Mandatory Provisions,” and Normative Appendix G, “Performance Rating Method.”

The installed lighting power identified in accordance with Section 9.1.3 shall not exceed the lighting power allowance developed in accordance with Section 9.2.1(a), (b), or (c).

9.2.2 Prescriptive Requirements 9.2.2.1 Interior Lighting Power Allowance. The interior lighting power allowance for a building or a separately metered or permitted portion of a building shall be determined by either Simplified Building Method described in Section 9.3, the Building Area Method described in Section 9.5.1, or the Space-by-Space Method described in Section 9.5.2.

Trade-offs of lighting power allowance among portions of the building for which a different calculation method has been used for compliance are not permitted.

Exception to 9.2.2.1: When using the compliance methods in Section 9.5.1 or 9.5.2 only, the lighting

equipment and applications listed in Table 9.2.2.1 shall not be considered when determining the inte- rior lighting power allowance developed in accordance with Section 9.5.1 or 9.5.2, nor shall the wattage for such lighting be included in the installed interior lighting power identified in accordance with Section 9.1.3. This exemption shall only apply when the lighting and controls are in compliance with the requirements of Table 9.2.2.1. Lighting controls noted in this table are the only required controls for this equipment and these applications.

9.2.2.2 Exterior Lighting Power Allowance. The exterior lighting power allowance shall be determined by

a. Section 9.3.2, “Simplified Building Method of Calculating Exterior Lighting Power Allowance,” when

using Section 9.3 to determine the interior lighting power allowance, or b. Section 9.4.2, “Exterior Lighting Power.”

9.3 Simplified Building Method Compliance Path. The Simplified Building Method contains the requirements for interior lighting in Section 9.3.1 and exterior lighting in Section 9.3.2 and shall be allowed to be used where at least 80% of the floor area supports either office buildings, retail buildings, or school buildings . The Simplified Building Method shall be used for new buildings or tenants improvements of less than 25,000 ft [2] . Interior and exterior wattage allowances shall be calculated and complied with separately.

9.3.1 Simplified Building Method of Calculating Interior Lighting Power Allowance. Buildings (new and alterations ) shall comply with the lighting power allowance and control requirements of Table 9.3.1-1, Table 9.3.1-2, or Table 9.3.1-3.

9.3.2 Simplified Building Method of Calculating Exterior Lighting Power Allowance. For all building types listed in Section 9.3, exterior areas (new and alterations ) shall comply with the lighting power allowance and control requirements of Table 9.3.2.

9.4 Mandatory Provisions 9.4.1 Lighting Control. Lighting controls shall be installed to meet the provisions of Section 9.4.1.1, 9.4.1.2, 9.4.1.3, and 9.4.1.4. 9.4.1.1 Interior Lighting Controls. For each space in the building, all of the lighting control functions indicated in Tables 9.5.2.1-1 and 9.5.2.1-2, for the appropriate space type in the first column, and as described below, shall be implemented. All control functions indicated as “REQ” are mandatory and shall be implemented. If a space type has control functions indicated as “ADD1,” then at least one of those functions shall be implemented. If a space type has control functions indicated as “ADD2,” then at least one of those functions shall be implemented. For space types not listed, select a reasonably equivalent type.

If using the Space-by-Space Method, the space type used for determining control requirements shall be the same space type that is used for determining the LPD allowance.

a. Local control: There shall be one or more manual lighting control device that provides ON and OFF control

of all lighting in the space . Each control device shall control an area (1) no larger than 2500 ft [2] if the space is  10,000 ft [2] and (2) no larger than 10,000 ft [2] otherwise. The device installed to comply with this provision shall be readily accessible and located so that the occupants can see the controlled lighting when using the control device . Exception to 9.4.1.1(a): Remote location of this local control device or devices shall be permitted for

reasons of safety or security when each remote control device has an indicator pilot light as part of or next to the control device and the control device is clearly labeled to identify the controlled lighting.

150 ANSI/ASHRAE/IES Standard 90.1-2022 (I-P)