Electricity is essential to modern day living and working. It can be supplied to plant and equipment by battery, mains or generator.
Electricity is a hazard that needs to be controlled. It can cause:
* Burns
* Electric shock
* Ignition source
Electric shock can cause muscle contraction and can disrupt breathing and the heart. A very low current (30 mA) across the heart can be fatal in a short time (fraction of a second).
With alternating currents people can end up involuntarily gripping onto a conductor, which increases the time of exposure.
Getting an electric shock can cause other injuries if people jump back as a result, possibly falling from height.
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