Table 1.3 Threshold Quantities

The analysis shall evaluate the consequences of the following failure modes and others deemed necessary by the AHJ:
(1) Thermal runaway condition in a single module, array, or unit
(2) Failure of an energy storage management system
(3) Failure of a required ventilation or exhaust system
(4) Failure of a required smoke detection, fire detection, fire suppression, or gas detection system

The AHJ shall be permitted to approve the hazardous mitigation analysis as documentation of the safety of the ESS installation provided the consequences of the analysis demon strate the following:

1. Fires will be contained within unoccupied ESS rooms for the minimum duration of the fire resistance rating
2. Suitable deflagration protection is provided where required.
3. ESS cabinets in occupied work centers allow occupants to safely evacuate in fire conditions
4. Toxic and highly toxic gases released during normal charging, discharging, and operation will not exceed the PEL in the area where the ESS is contained.
5. Toxic and highly toxic gases released during fires and other fault conditions will not reach concentrations in excess of immediately dangerous to life or health (IDLH) level in the building or adjacent means of egress routes during the time deemed necessary to evacuate from that area.
6. Flammable gases released during charging, discharging, and normal operation will not exceed 25 percent of the LFL.

Construction, equipment, and systems that are required for the ESS to comply with the hazardous mitigation analysis shall be installed, tested, and maintained in accordance with this standard and the manufacturer’s instructions.

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