Washington Administrative Code › Title 51 - Enterprise Services, Department of (Building Code Council) › Chapter 51-11C - State Building Code adoption and amendment of the 2021 edition of the International Energy Conservation Code, Commercial › Section 51-11C-40903 - Section C4093-End-use metering

Current through Register Vol. 24-14, July 15, 2024
C409.3 End-use metering.
Meters shall be provided
				to collect energy use data for each end-use category listed in Sections
				C409.3.1 through C409.3.7. These meters shall collect data for the whole
				building or for each separately metered portion of the building where not
				exempted by the exception to Section C409.1. Not more than 10 percent of the
				total connected load of any of the end-use metering categories in Sections
				C409.3.1 through C409.3.6 is permitted to be excluded from that end-use data
				collection. Not more than 10 percent of the total connected load of any of the
				end-use metering categories in Sections C409.3.1 through C409.3.6 is permitted
				to consist of loads not part of that category. Multiple meters may be used for
				any end-use category, provided that the data acquisition system totals all of
				the energy used by that category. Full-floor tenant space submetering data
				shall be provided to the tenant in accordance with Section C409.7, and the data
				shall not be required to be included in other end-use categories.
EXCEPTIONS
:
1. HVAC and service water heating equipment serving
						  only an individual dwelling unit or sleeping unit does not require end-use
						  metering.
2. Separate metering is not required for fire pumps,
						  stairwell pressurization fans or other life safety systems that operate only
						  during testing or emergency.
3. End use metering is not required for individual
						  tenant spaces not exceeding 2,500 square feet in floor area when a dedicated
						  source meter meeting the requirements of Section C409. 4.1 is provided for the
						  tenant space.
4. Health care facilities with loads in excess of 150k
						  VA are permitted to have submetering that measures electrical energy usage in
						  accordance with the normal and essential electrical systems except that
						  submetering is required for the following load categories:
4.1. HVAC system energy use in accordance with the
						  requirements of Section C409.3.1.
4.2. Service water heating energy use in accordance
						  with the requirements of Section C409.3.2.
4.3. Process load system energy in accordance with the
						  requirements of Section C409.3.5 for each significant facility not used in
						  direct patient care including, but not limited to, food service, laundry and
						  sterile processing facilities, where the total connected load of the facility
						  exceeds 100 kVA.
5. End-use metering is not required for electrical
						  circuits serving only sleeping rooms and guest suites within Group R-1
						  occupancies. This exception does not apply to common areas or to equipment
						  serving multiple sleeping rooms.
C409.3.1 HVAC system energy use.
This category
				shall include all energy including electrical, gas, liquid fuel, district steam
				and district chilled water that is used by boilers, chillers, pumps, fans and
				other equipment used to provide space heating, space cooling, dehumidification
				and ventilation to the building, but not including energy that serves process
				loads, service water heating or miscellaneous loads as defined in Section
				C409.3. Multiple HVAC energy sources, such as gas, electric and steam, are not
				required to be summed together.
EXCEPTIONS
:
1. 120 volt equipment.
2. An HVAC branch circuit where the total MCA of
						  equipment served equates to less than 10 kVA.
3. Individual fans or pumps that are not on a variable
						  frequency drive.
C409.3.2 Service water heating energy use.
This
				category shall include all energy used for heating of domestic and service hot
				water, but not energy used for space heating.
EXCEPTION:
Service water heating energy use less than 50 kVA does
						  not require end-use metering.
C409.3.3 Lighting system energy use.
This category
				shall include all energy used by interior and exterior lighting, including
				lighting in parking structures and lots, but not including plug-in task
				lighting.
C409.3.4 Electric vehicle charging energy use.
This category shall include all energy used for electric vehicle charging. For
				buildings exempt from data collection systems, the data from these meters is
				permitted to either be stored locally using a manual totalizing meter or other
				means at the meter or fed into a central data collection system.
C409.3.5 Plug load system energy use.
This
				category shall include all energy used by appliances, computers, plug-in task
				lighting, and other equipment or equipment covered by other end-use metering
				categories listed in Section C409.3. In a building where the main service is
				480/277 volt, each 208/120 volt panel is permitted to be assumed to serve only
				plug load for the purpose of Section C409, unless it serves nonresidential
				refrigeration or cooking equipment.
EXCEPTION:
Where the total connected load of all plug load
						  circuits is less than 50 kVA, end-use metering is not required.
C409.3.6 Process load system energy use.
This
				category shall include all energy used by any nonbuilding process load
				including, but not limited to, nonresidential refrigeration and cooking
				equipment, laundry equipment, industrial equipment, and stage lighting.
EXCEPTION:
Where the process load energy use is less than 50 kVA
						  end-use metering is not required.
C409.3.7 Full-floor tenant space electrical
				submetering.
In a multitenant building where more than 90 percent of the
				leasable area of a floor is occupied by a single tenant, an electrical energy
				use display shall be provided to the tenant in accordance with the requirements
				of Section C409.4.3. Electrical loads from areas outside of the tenant space or
				from equipment that serves areas outside the tenant space shall not be included
				in the tenant space submetering. A single display is permitted to serve
				multiple floors occupied by the same tenant.
Statutory Authority:
				  RCW
				    19.27A.020,
				  19.27A.025 and
				  chapters
				  19.27 and
				  34.05 RCW. 13-04-056, §
				  51-11C-40903, filed 2/1/13, effective
				  7/1/13.