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the water as recommended to eliminate possible bacteria. Squeeze bottles are date coded and should be replaced before the expiration date. Exercise can­ister units periodically to prevent clogging of the head. Ensure that a good flow of water is available when it's really needed.

c. Explosive gas hazard. The NEC requires re­moval of possible explosive gas buildup, since all battery types can outgas. Check that gas accumula­tion is limited to less than 2 percent of the total volume of the battery room or enclosure. For flooded lead-acid batteries, the maximum hydrogen evolu­tion rate is 0.000269 cubic feet (7618 cubic millime­ters) per minute per charging ampere per cell at 77 degrees F (25 degrees C), one atmosphere. The maximum rate occurs when a fully charged battery has maximum current forced into it.

d. Electrical hazard. Most batteries are operated ungrounded, so touching a live part will not result in a shock. The real hazard exists when an acciden­tal ground is already present and a person touches a live part. In this case, the person completes the circuit to ground and current will flow through the person. While personnel may recognize that this

Table 14-1. Battery room warning notice

Batteries contain (sulfuric acid) (potassium hydroxide solution).

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