Document ID: chunk:federal_register_of_legislation:F2016L00407:body:0:p50
Version: federal_register_of_legislation:F2016L00407
Segment Type: other
Provision Reference: 
Character Range: 139043–144578

rise in the earth potential due to a high impedance return path to the distribution neutral.
                                                                        * Lack of information about isolation, sources of supply or the location
                                                                          of electrical conductors.
                                                                        * Lack of clear safe access to locate electric cables (other hazards may
                                                                          be present such as exposed conductors).
                                                                        * Damage to conductors in metallic conduits where earthing continuity
                                                                          of the conduit has not been maintained.
                                                                        * Equipment located in hazardous areas, which includes bolt-on or screw-on covers, can be dangerous if opened without obtaining specialist advice.
                                                                        * Working alone on energised equipment.
                                                                        * Drilling into switchboards/electrical enclosures.
                                                                        * Contact with cables in walls, floors or roof spaces.
                                                                        * Contact with cables during excavation work or cutting/drilling concrete.
                                                                        * Exposure to asbestos material/switchboards.
                                                                        * Variable frequency devices.
                                                                        * Multiple circuits located within the one conduit.
                                                                        * Use of conductive/flammable cleaning solvents creating an explosive atmosphere.
Testing and fault finding low-voltage equipment and installations   Risks arise as it is difficult to find faults or malfunctions in electrical equipment when the circuits are not energised or when the equipment is not operating, especially if feedback circuits or sensors are involved. Risks can include:
                                                                        * electrical drawings/tables not reflecting 'as installed' installations
                                                                        * exposed energised terminals or conductors
                                                                        * terminals or conductors being energised under different conditions of operation of the equipment
                                                                        * loose or disconnected test leads or wiring becoming energised
                                                                        * test equipment and leads bringing electrical hazards closer to the worker
                                                                        * test equipment inappropriate for the task (particularly test probes)
                                                                        * inadequate test points
                                                                        * inadvertent attempts to start machinery by other persons
                                                                        * incorrect or poorly maintained testing instruments
                                                                        * inadequate knowledge of equipment or causes of faults
                                                                        * lack of information about circuits or equipment
                                                                        * equipment located in hazardous areas, which includes bolt-on or screw-on covers, can be dangerous if opened without obtaining specialist advice
                                                                        * testing or fault finding alone on energised equipment
                                                                        * testing or fault finding in cramped or restricted work situations
                                                                        * rotating or moving machinery (crush hazards)
                                                                        * overriding of interlocks or forcing of control equipment
                                                                        * re-setting of protective devices in energised switchboards

                                                                        * electrical installations where unauthorised electrical work has been undertaken.
High fault currents – working, testing or fault finding energised   When working, testing or fault finding on energised electrical equipment,
                                                                    a fault current of up to 20 times the rated current of the supply transformer can flow for short duration during fault conditions.
                                                                    Arcs can have the energy to cause an explosion and/or melt metallic switchboard cubicles and equipment. Arcs may cause severe burns to the skin and flash burns to the face and eyes. Inhaled hot gases and molten particles can cause serious internal burns