480.9 Battery Locations.
Section 480.9 (E) requires any personnel doors intended for entrance to, and egress from a battery room, to open in the direction of egress and be
Verify the hydrogen emission rate with the battery and/or charger manufacturer. To enhance battery room safety, engineers will install explosion-proof equipment, such as fans and lights. The fan must be an explosion-proof fan or a fan rated to operate in a Class 1, Division 1, Group B/C/D environment, that can do six air changes per hour.
All wiring leaving/entering the enclosed battery room should be sealed with appropriate conduit/cable seals including floor and ceiling penetrations. Note that suspended ceiling tiles are not an effective barrier in the battery room. It should also be noted that some form of makeup air needs to be provided for the room.
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. (D) Top Terminal Batteries.
Battery locations shall conform to 480.9 (A), (B), and (C). (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. (B) Live Parts. Guarding of live parts shall comply with 110.27.
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