ASHRAE-90.1-2022- - Page 151
Extracted Content
in a new wattage at least 50% below the original wattage of each altered lighting system . Additionally, the new and retrofitted lighting shall comply with the control requirements of Sections 9.4.1.1(a), 9.4.1.1(h), 9.4.1.1(i) as applicable to each altered space as shown in Tables 9.5.2.1-1 and 9.5.2.1-2 and Section 9.5.2.2.
9.1.1.3.2 Lighting Alterations for Exterior Building Areas. The alteration of a lighting system for an exterior area shall use only the area-specific allowances in Table 9.4.2-2 and shall not use the base site allowances to determine the LPA . Additionally, the exterior alteration shall meet one of the following:
a. The alteration shall comply with Section 9.2 when the total number of new and retrofitted luminaires is
greater than 10 or where the combined length of new and retrofitted linear luminaires is greater than 20 linear feet. b. Where the total number of new and retrofitted luminaires is not greater than 10, or where the combined
length of new and retrofitted linear luminaires is not greater than 20 linear feet of linear luminaires, the total wattage of the alteration shall be no greater than the maximum LPA permitted by Table 9.4.2-2, or the total new wattage shall be at least 50% below the total original wattage of that lighting system . Additionally, the new and retrofitted lighting shall comply with the control requirements of Section 9.4.1.4(a).
9.1.2 Climate. Climate zones shall be determined in accordance with Section 5.1.5. 9.1.3 Installed Lighting Power. The luminaire wattage for all interior and exterior applications shall include all power used by the luminaires, including lamps, ballasts / drivers, transformers, and control devices, except as specifically exempted in Section 9.1.1, 9.2.2.1, or 9.2.2.2.
Exception to 9.1.3: If two or more independently operating lighting systems in a space are capable of
being controlled to prevent simultaneous user operation, the installed interior lighting power or the installed exterior lighting power shall be based solely on the lighting system with the highest wattage.
9.1.4 Interior and Exterior Luminaire Wattage. The wattage of lighting equipment, when used to calculate either installed interior lighting power or installed exterior lighting power, shall be determined in accordance with the following criteria:
a. The wattage of lighting equipment connected to line voltage shall be the manufacturers ’ labeled maxi mum wattage. b. The wattage of line voltage lighting equipment with remote ballasts / drivers or similar devices shall be
the total input wattage of all line voltage components in the system . Exception to 9.1.4(b): Lighting power calculations for ballasts with adjustable ballast factors shall be
based on the ballast factor that will be used in the space, provided that the ballast factor is not user field-changeable. c. The wattage of line-voltage lighting track and plug-in busway designed to allow the addition and/or relo cation of lighting equipment without altering the wiring of the system shall be the lesser of
- the specified wattage of the lighting equipment included in the system with a minimum of 10 W/lin ft or
- the wattage limit of permanent current-limiting devices on the system . d. The wattage of low-voltage lighting track, cable conductor, rail conductor, and other flexible lighting
systems that allow the addition and/or relocation of lighting equipment without altering the wiring of the system shall be the specified wattage of the ballast/driver or transformer supplying the system . e. The wattage of a DC low-voltage lighting system that employs flexible cabling for plug-in connection of
the lighting equipment and a remote power supply shall be labeled maximum wattage of the system power supply. For systems that also provide power to equipment other than lighting, the wattage shall be labeled maximum wattage of the system power supply reduced by the wattage of the nonlighting equip- ment connected to the system . f. The wattage of a retrofitted luminaire shall be the manufacturer’s labeled input power of the new light source plus driver. g. The wattage of all other miscellaneous lighting equipment shall be the specified wattage of the lighting
equipment .
9.2 Compliance Paths. Lighting systems and equipment shall comply with Section 9.2.1. 9.2.1 Requirements for All Compliance Paths. Lighting systems and equipment shall comply with Sections 9.1 “General”; 9.7, “Submittals”; 9.9, “Verification, Testing, and Commissioning”; and one of the following:
a. Section 9.3, “Simplified Building Method Compliance Path” or b. Section 9.4, “Mandatory Provisions”, and Section 9.5.1, “Building Area Method Compliance Path” or
ANSI/ASHRAE/IES Standard 90.1-2022 (I-P) 149