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Battery locations shall conform to 480.10(A) through (G).
(A) Ventilation
Provisions appropriate to the battery technology shall be made for sufficient diffusion and ventilation of gases from the battery, if present, to prevent the accumulation of an explosive mixture.
Informational Note No. 1: See NFPA 1—2018, Fire Code, Chapter 52, for ventilation considerations for specific battery chemistries.
Informational Note No. 2: Some battery technologies do not require ventilation.
Informational Note No. 3: For additional information on the ventilation of stationary battery systems, see IEEE Std 1635—2012/ASHRAE Guideline 21—2012 Guide for the Ventilation and Thermal Management of Batteries for Stationary Applications.
(B) Live Parts
Guarding of live parts shall comply with 110.27.
(C) Spaces About Battery Systems
Spaces about battery systems shall comply with 110.26 and 110.34. Working space shall be measured from the edge of the battery cabinet, racks, or trays.
For battery racks, there shall be a minimum clearance of 25 mm (1 in.) between a cell container and any wall or structure on the side not requiring access for maintenance. Battery stands shall be permitted to contact adjacent walls or structures, provided that the battery shelf has a free air space for not less than 90 percent of its length.
Informational Note: Additional space is often needed to accommodate battery hoisting equipment, tray removal, or spill containment.
(D) Top Terminal Batteries
Where top terminal batteries are installed on tiered racks or on shelves of battery cabinets, working space in accordance with the battery manufacturer's instructions shall be provided between the highest point on a cell and the row, shelf, or ceiling above that point.
Informational Note: IEEE 1187—2013, IEEE Recommended Practice for Installation Design and Installation of Valve-Regulated Lead-Acid Batteries for Stationary Applications, provides guidance for top clearance of valve-regulated lead-acid batteries, which are commonly used in battery cabinets.
(E) Egress
Personnel doors intended for entrance to, and egress from, rooms designated as battery rooms shall open in the direction of egress and shall be equipped with listed panic or listed fire exit hardware.
(F) Piping in Battery Rooms
Gas piping shall not be permitted in dedicated battery rooms.
(G) Illumination
Illumination shall be provided for working spaces containing battery systems. The lighting outlets shall not be controlled by automatic means only. Additional lighting outlets shall not be required where the work space is illuminated by an adjacent light source. The location of luminaires shall not:
  1. Expose personnel to energized battery components while performing maintenance on the luminaires in the battery space; or
  2. Create a hazard to the battery upon failure of the luminaire.