Batteries

Because batteries are a common source of power at mine sites, miners must be trained in the proper procedure for working with and handling batteries.

Sagging battery compartment covers may be an indication that damage to the internal insulation or internal electrical components has occurred. Sagging battery compartment covers and badly worn insulation can result in arcs and sparks that may cause a fire or shock. Even though the battery compartment of certain diesel or electrically powered equipment must have fire protection by an automatic fixed fire suppression system, the risk of fire or shock can further be minimized by periodically examining the insulation in the battery compartment. As a rule, foreign materials and supplies should not be stored on the battery box.

A sagging battery compartment cover should be replaced or repaired if its insulating lining is contacting components in the battery compartment. Conductor insulation, fuse holders, connectors, and the linings of battery compartment walls and covers should be examined and replaced or repaired if wear or corrosion is observed.

Batteries contain acid and can both explode and catch on fire. In the event of a battery explosion or fire, acid and toxic fumes are released. When acid contacts the skin, painful burns and scarring may result. When people inhale battery acid fumes, their lungs are burned from the toxic chemicals present in the fumes. Blindness will likely result if acid contacts the eye. These physical injuries are irreversible. Therefore, when working with batteries, it is important for workers to wear proper PPE to prevent exposure.

When batteries are being charged, explosive gases are produced. Heat and sparks can ignite these gases, causing a fire or explosion. All smoking, open flames, and spark-producing items, such as grinders, welders, or other electrical equipment, should be kept clear of batteries.

Surface leakage is a condition caused when dust mixes with spilled electrolyte on the battery, creating a low-resistance path. This low-resistance path can "short" the battery. A shorted battery creates heat that can potentially cause a fire. Batteries should be kept clean and free of excess dust to protect against shorting.

To learn more about MSHA Part 48 training requirements visit our MSHA Part 48 Subpart B Surface Mining Online Training web page.