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(2) Accidental grounds. It is not uncommon to find that a ground exists on a battery. This can occur when the electrolyte on top of a cell tracks across the cover, down the plastic jar, and contacts a metallic part of the rack. The electrolyte, being con­ductive, establishes a ground path.

(3) Normal safety procedures. When working around batteries, all normal safety procedures should be followed, including the use of protective equipment. Caution must be exercised in placing meters on top of batteries. Under certain conditions, meters with enclosures partially made of metal can cause a short circuit and sparks. Metal objects should never be placed on top of batteries, and metal tools used on batteries should be insulated to prevent accidental short circuits. Generally, a ground detector is provided as part of the dc system, most often in the battery charger.

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