ASHRAE-90.1-2022- - Page 147

Extracted Content

8.4.1 Voltage Drop. The feeder conductors and branch circuits combined shall be sized for a maximum of 5% voltage drop total.

8.4.2 Automatic Receptacle Control. The following shall be automatically controlled:

a. At least 50% of all 125 V, 15 and 20 amp receptacles in all private offices, conference rooms, rooms used

primarily for printing and/or copying functions, break rooms, classrooms, and individual workstations. b. At least 25% of branch circuit feeders installed for modular furniture not shown on the construction doc-

uments.

This control shall function on

a. a scheduled basis using a time-of-day operated control device that turns receptacles off at specific pro grammed times—an independent program schedule shall be provided for controlled areas of no more than 5000 ft [2] and not more than one floor (the occupant shall be able to manually override the control device for up to two hours); b. an occupancy sensor that shall turn receptacles off within 20 minutes of all occupants leaving a space ; or c. an automated signal from another control or alarm system that shall turn receptacles off within 20 min utes after determining that the area is unoccupied.

All controlled receptacles shall be permanently marked to visually differentiate them from uncontrolled receptacles and are to be uniformly distributed throughout the space . Plug-in devices shall not be used to comply with Section 8.4.2.

Exceptions to 8.4.2: Receptacles for the following shall not require an automatic control device :

1. Receptacles specifically designated for equipment requiring continuous operation (24/day, 365 days/year).
2. Spaces where an automatic control would endanger the safety or security of the room or building occupants.

8.4.3 Electrical Energy Monitoring 8.4.3.1 Monitoring. Measurement devices shall be installed in new buildings to monitor the electrical energy use for each of the following separately:

a. Total electrical energy b. HVAC systems c. Interior lighting d. Exterior lighting e. Receptacle circuits f. Refrigeration systems

For buildings with tenants, these systems shall be separately monitored for the total building and (excluding shared systems ) for each individual tenant.

Exception to 8.4.3.1: Where the design load of any of the categories (b) through (f) are less than 10% of

the whole-building load, these categories shall be allowed to be combined with other categories.

8.4.3.2 Recording and Reporting. The electrical energy use for all loads specified in Section 8.4.3.1 shall be recorded a minimum of every 15 minutes and reported at least hourly, daily, monthly, and annually. The data for each tenant space shall be made available to that tenant. In buildings with a digital control sys- tem installed to comply with Section 6.4.3.10, the energy use data shall be transmitted to the digital control system and graphically displayed. The system shall be capable of maintaining all data collected for a minimum of 36 months.

Exceptions to 8.4.3.1 and 8.4.3.2:

1. Building less than 25,000 ft [2] .
2. Individual tenant spaces less than 10,000 ft [2] .
3. Dwelling units .
4. Residential buildings with less than 10,000 ft [2] of common area.
5. Critical equipment and life-safety branches of NFPA 70, Article 517.

8.4.4 Low-Voltage Dry-Type Distribution Transformers. Low-voltage dry-type distribution transform- ers shall comply with the requirements shown in Table 8.4.4. Transformers that are not included in the definition of distribution transformers as defined in 10 CFR 431.192 have no performance requirements in this section and are listed for ease of reference as exceptions.

Exception to 8.4.4: Transformers that meet any of the following exclusions in the U.S. DOE definition of

“distribution transformers” found in 10 CFR 431.192:

ANSI/ASHRAE/IES Standard 90.1-2022 (I-P) 145