Voltages

The normal mains electricity voltage via a three-pin socket outlet is 240 volts; heavy duty equipment such as vehicle hoists use 415 volts in the form of a three-phase supply. Both 240 volt and 415 volt supplies are likely to kill anybody who touches them.Supplies of 415 volts must be used through a professionally installed system. If 240 volts is used for power tools,then a safety circuit breaker should be used. A safer supply for power tools is 110 volts;this may be wired into the workshop as a separate circuit or provided through a safety transformer.

Inspection hand-lamps are safest with a 12 volt supply; but for reduced current flow 50 volt hand-lamp systems are frequently used.