4001 - Danger 240 volts
4002 - Danger 110 volts
4003 - Danger 415 volts
4004 - Danger 440 volts
4005 - Danger 11,000 volts
4006 - Danger bare live wires
4007 - High voltage cables overhead
4008 - Warning high voltage cables underground
4009 - Danger high voltage
4010 - Danger live wires
4022 - Danger 400 volts
4015 - Caution underground services
4017 - Danger, live busbars
