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(1) Corrosion. The jars normally rest on corrosion-resistant supports or plastic jar-supporting channels installed on the rack structure. Check these and all items composing the rack for corrosion.

(2) Seismic. If the battery rack is a seismic type for installations requiring earthquake protection, additional checks of the rails and spacers must be made. Seismic racks use rails and spacers to pre­vent movement of cells during an earthquake, and

the spacers function to prevent adjacent cells from knocking together. The side rails are covered by a corrosion-resistant cover (such as a plastic channel) where they touch the jars. Check to ensure that all side rails, end rails, and spacers are in place, and that bolts are properly torqued. Portions of the rack seismic equipment may occasionally be disas­sembled to allow maintenance to be performed on the battery or for cell replacement. The ability of the rack to protect the battery during an earth­quake will be impaired if rack reassembly is not properly tightened.

(3) Grounding. Check that ground connections are correct, tight, and uncorroded.

/. Damaging actions to be noted. Low electrolyte levels, vibration, hydration, or frozen electrolyte can often damage batteries beyond repairability and such batteries should be noted for prompt replace­ment.

g. Low electrolyte levels.

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