Battery Energy Storage Systems

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Revision 4 · Oct 19, 2026 +6 −6

Remake batch 25 and its neighbor re-points, batch 24 where missing, and the adopted-electrical-code parameter: brought in line with the authoring repository
Showing changes from Rev 3 to Rev 4 in Battery Energy Storage Systems.
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title: Battery Energy Storage Systems
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When to use: Stationary battery energy storage systems at the building and campus scale, listed to UL 9540 and installed under NFPA 855 and the adopted fire code, on commercial, institutional, industrial, and multifamily projects and on campus and microgrid sites: lithium-ion, sodium-ion, lead-acid, and flow chemistries, in a battery room, a dedicated building, a factory-assembled outdoor cabinet, a walk-in container, or on a roof, applied to peak shaving, time-of-use shifting, backup of designated loads, photovoltaic firming, utility programs, and islanded operation. Covers the listing and the UL 9540A test data and what they decide, the chemistry, the installation location and the enclosure, the usable energy and the rated power, the power conversion system and its IEEE 1547 grid-support functions, the point of interconnection and export control, the battery management system, the site controller and its communications, thermal management, the fire and gas detection, suppression, and explosion control integral to the installation, separation distances, the hazard mitigation analysis and the emergency response plan, factory and field testing including the capacity test, installation, decommissioning, warranty, and spares.
− Not intended for: The station battery and charger plant that supplies switchgear control power, telecommunications, or SCADA (see [[sync/dc-battery-systems]]); the uninterruptible power supply and the battery inside it that rides a critical load through an interruption (see [[sync/uninterruptible-power-supply-systems]]); the photovoltaic array, its modules, inverters, combiners, array DC wiring, and rapid shutdown (see [[sync/photovoltaic-systems]]); the classification of loads, the alternate source selection, and the transfer scheme of the emergency and standby power system (see [[sync/emergency-and-standby-power]]); the engine-generator set (see [[sync/generators]]), the automatic transfer switch (see [[sync/automatic-transfer-switches]]), and generator paralleling switchgear (see [[sync/generator-paralleling-switchgear]]); the fire alarm control unit, its initiating devices and notification appliances, and its transmission to the supervising station (see [[sync/fire-alarm-systems]]); the sprinkler system of the room or building (see [[sync/wet-pipe-fire-sprinkler-systems]]) and a room-flooding clean agent system installed as a building system (see [[sync/clean-agent-fire-suppression]]); gas detection of parking garages, refrigerant machinery rooms, and other occupied spaces (see [[sync/gas-detection-systems]]); the grounding electrode system and the equipment grounding conductors (see [[sync/grounding-and-bonding]]); the feeders, the field-installed DC conductors, and the raceways (see [[sync/conductors-and-cables]], [[sync/raceways-and-conduit]]); the switchboard, switchgear, or panelboard the system lands on (see [[sync/low-voltage-switchboards]], [[sync/low-voltage-switchgear]], [[sync/medium-voltage-switchgear]], [[sync/panelboards]]); the step-up transformer (see [[sync/medium-voltage-transformers]]); the utility service and its upgrade (see [[sync/electrical-service-entrance]]); the enclosed switch furnished as a disconnecting means (see [[sync/enclosed-switches-and-disconnects]]); the short-circuit, coordination, and arc-flash studies (see [[sync/short-circuit-study]], [[sync/protective-coordination-study]], [[sync/arc-flash-study]]); the surge protective device as a product (see [[sync/surge-protective-devices]]); nameplates, labels, and placards as products (see [[sync/electrical-identification]]); the meters themselves (see [[sync/electrical-power-monitoring]]); the building automation system that reads the storage data (see [[sync/building-automation-system]]); the network cabling (see [[sync/structured-cabling]]); the concrete pad (see [[sync/concrete-pads]]); the room as a rated assembly (see [[sync/fire-rated-wall-and-floor-assemblies]], [[sync/firestopping]], [[sync/electrical-rooms]]); bollards and security fencing (see [[sync/site-furnishings-and-bollards]], [[sync/fencing-and-gates]]); electric vehicle charging equipment, including a charger with an integral battery (see [[sync/electric-vehicle-charging]]); microgrid and economic-dispatch controllers that command more than one source; transmission-connected storage under an ISO or RTO agreement; mobile and portable storage; flywheel, thermal, compressed-air, and hydrogen storage; and vehicle traction batteries, including second-life packs not listed to UL 1973.
+ Not intended for: The station battery and charger plant that supplies switchgear control power, telecommunications, or SCADA (see [[sync/dc-battery-systems]]); the uninterruptible power supply and the battery inside it that rides a critical load through an interruption (see [[sync/uninterruptible-power-supply-systems]]); the photovoltaic array, its modules, inverters, combiners, array DC wiring, and rapid shutdown (see [[sync/photovoltaic-systems]]); the classification of loads, the alternate source selection, and the transfer scheme of the emergency and standby power system (see [[sync/emergency-and-standby-power]]); the engine-generator set (see [[sync/generators]]), the automatic transfer switch (see [[sync/automatic-transfer-switches]]), and generator paralleling switchgear (see [[sync/generator-paralleling-switchgear]]); the fire alarm control unit, its initiating devices and notification appliances, and its transmission to the supervising station (see [[sync/fire-alarm-systems]]); the sprinkler system of the room or building (see [[sync/wet-pipe-fire-sprinkler-systems]]) and a room-flooding clean agent system installed as a building system (see [[sync/clean-agent-fire-suppression]]); gas detection of parking garages, refrigerant machinery rooms, and other occupied spaces (see [[sync/gas-detection-systems]]); the grounding electrode system and the equipment grounding conductors (see [[sync/grounding-and-bonding]]); the feeders, the field-installed DC conductors, and the raceways (see [[sync/conductors-and-cables]], [[sync/raceways-and-conduit]]); the switchboard, switchgear, or panelboard the system lands on (see [[sync/low-voltage-switchboards]], [[sync/low-voltage-switchgear]], [[sync/medium-voltage-switchgear]], [[sync/panelboards]]); the step-up transformer (see [[sync/medium-voltage-transformers]]); the utility service and its upgrade (see [[sync/electrical-service-entrance]]); the enclosed switch furnished as a disconnecting means (see [[sync/enclosed-switches-and-disconnects]]); the short-circuit, coordination, and arc-flash studies (see [[sync/short-circuit-study]], [[sync/protective-coordination-study]], [[sync/arc-flash-study]]); the surge protective device as a product (see [[sync/surge-protective-devices]]); nameplates, labels, and placards as products (see [[sync/equipment-labeling]]); the meters themselves (see [[sync/electrical-power-monitoring]]); the building automation system that reads the storage data (see [[sync/building-automation-system]]); the network cabling (see [[sync/structured-cabling]]); the concrete pad (see [[sync/concrete-pads]]); the room as a rated assembly (see [[sync/fire-rated-wall-and-floor-assemblies]], [[sync/firestopping]], [[sync/electrical-rooms]]); bollards and security fencing (see [[sync/site-furnishings-and-bollards]], [[sync/fencing-and-gates]]); electric vehicle charging equipment, including a charger with an integral battery (see [[sync/electric-vehicle-charging]]); microgrid and economic-dispatch controllers that command more than one source; transmission-connected storage under an ISO or RTO agreement; mobile and portable storage; flywheel, thermal, compressed-air, and hydrogen storage; and vehicle traction batteries, including second-life packs not listed to UL 1973.
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- the short-circuit, coordination, and arc-flash studies that take the fault contribution of the system as an input, under [[sync/short-circuit-study]], [[sync/protective-coordination-study]], and [[sync/arc-flash-study]]
- the surge protective device as a product, under [[sync/surge-protective-devices]], and the lightning protection system, under [[sync/lightning-protection]]
−- the material, lettering, and attachment of nameplates, labels, and placards, under [[sync/electrical-identification]]
+- the material, lettering, and attachment of nameplates, labels, and placards, under [[sync/equipment-labeling]]
- the revenue and submetering instruments, under [[sync/electrical-power-monitoring]]
- the building automation system that reads the storage data, under [[sync/building-automation-system]], and the network cabling, under [[sync/structured-cabling]]
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## Regulatory Requirements {toc}
−### The installation shall comply with the editions of NFPA 70, NFPA 855, and the fire code adopted with [[parameter: adopted-building-code]] and with the amendments of the Authority Having Jurisdiction.
+### The installation shall comply with NFPA 70 as adopted in [[parameter: adopted-electrical-code]], with the editions of NFPA 855 and the fire code adopted with [[parameter: adopted-building-code]], and with the amendments of the Authority Having Jurisdiction.
### The Contractor shall confirm in writing with the Authority Having Jurisdiction, before the action submittals, the edition of NFPA 855 in force, whether a hazard mitigation analysis is required, and whether the UL 9540A test data will be accepted as the basis for separation, unit size, and explosion control.
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### A disconnecting means for the energy storage system shall be provided in accordance with NFPA 70 706.15, readily accessible, within sight of the system or lockable in the open position, and marked with the nominal voltage, the available fault current, the arc-flash label required under [[sync/arc-flash-study]], and the date the fault current was calculated.
−### A permanent plaque or directory shall be installed at the service equipment and at every point of interconnection in accordance with NFPA 70 705.10, identifying every power source on the premises and the location of the energy storage system disconnecting means, with the plaque furnished under [[sync/electrical-identification]].
+### A permanent plaque or directory shall be installed at the service equipment and at every point of interconnection in accordance with NFPA 70 705.10, identifying every power source on the premises and the location of the energy storage system disconnecting means, with the plaque furnished under [[sync/equipment-labeling]].
### The surge protection of the power conversion system AC terminals shall be as the manufacturer's listing requires, and a surge protective device furnished at the point of interconnection shall comply with [[sync/surge-protective-devices]].
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### The Contractor shall arrange one orientation of the responding fire department at the site before the system is energized, attended by the manufacturer's technician, covering the plan, the shutdown controls, and the hazards, and shall record the attendance in the closeout submittals.
−### The signage required by NFPA 70 Article 706, NFPA 855, and the adopted fire code at the system, the disconnecting means, the room door, and the enclosure doors shall be furnished under [[sync/electrical-identification]] with the content this standard requires.
+### The signage required by NFPA 70 Article 706, NFPA 855, and the adopted fire code at the system, the disconnecting means, the room door, and the enclosure doors shall be furnished under [[sync/equipment-labeling]] with the content this standard requires.
# Testing and Commissioning {toc}
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### Each unit shall carry the manufacturer's listing mark, the nameplate and usable energy, the rated power, the DC and AC voltages, the chemistry, and the date of manufacture as applied by the manufacturer.
−### Each disconnecting means, each emergency shutdown control, the point of interconnection, and the room or enclosure door shall be labeled as NFPA 70 Articles 705 and 706 and NFPA 855 require, with the labels furnished under [[sync/electrical-identification]].
+### Each disconnecting means, each emergency shutdown control, the point of interconnection, and the room or enclosure door shall be labeled as NFPA 70 Articles 705 and 706 and NFPA 855 require, with the labels furnished under [[sync/equipment-labeling]].
### The arc-flash warning label on each enclosure door and disconnecting means shall state the incident energy and the arc-flash boundary determined under [[sync/arc-flash-study]] for the DC and the AC sides, and shall state that the battery remains energized after the disconnecting means is opened.
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## Spare parts shall be identical to and interchangeable with the installed parts, shall be the parts the manufacturer lists for the system, and shall be delivered in their original packaging and labeled with the unit and the part they serve.

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