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Follow the links below to find material targeted to the unit's elements, performance criteria, required skills and knowledge

Elements and Performance Criteria

1. Explain hazards and isolation procedures associated with live electrical components
   • Effects of electricity on the human body are outlined
   • Procedure to be taken in the event of a person suffering an electric shock is clarified
   • Correct procedure for isolating an electrical circuit is clarified
   • Electrical hazards in a vessel at sea or port are identified
2. Explain basic operation of and hazards associated with marine high voltage installations
   • Functional and operational requirements for a marine high voltage system are detailed
   • Safety procedures required when working in high voltage environments are outlined
   • Procedure for assisting suitably qualified personnel to carry out maintenance and repair of high voltage switchgear of various types is outlined
3. Explain principles of power generation and transmission in AC and DC circuits
   • Excitation methods used to produce alternating current (AC) and direct current (DC) voltages are outlined
   • Basic voltage control of generated AC voltages is outlined
4. Outline key features of basic electrical diagrams used on vessels
   • Types of diagrams used to depict electrical systems on ships are outlined
   • Electrical symbols used in basic electrical diagrams are identified
   • Electrical devices used in basic electrical circuits are clarified
5. Use common electrical measuring and testing instruments
   • Different types of multimeters are used appropriately
   • Functions of insulation and ‘tong’ testers are explained
   • Safety requirements when using test equipment are applied
6. Rectify basic electrical faults
   • Fault situation is determined by appropriate questioning of client or operator
   • Safe working practices are demonstrated when carrying out fault-finding work
   • Basic common faults of equipment and techniques used to find faults are outlined
   • Knowledge of various types of basic common faults of circuits and techniques is used to find faults
   • Basic common faults in electrical equipment are identified and rectified
7. Outline basic components and layout of a marine electrical switchboard
   • Layout of a typical three wire insulated electrical system is sketched
   • Interconnections between main switchboard, emergency switchboard and shore supply are explained
   • Procedure for changing over to emergency switchboard for testing or during loss of mains power is outlined
   • Safety features on a typical marine switchboard are identified
8. Explain operation of shipboard alternators
   • Types and construction methods of alternators used on a marine vessel are outlined
   • Principles of operation of a marine type alternator are outlined
   • Relationship is shown between voltage and speed in regulation of alternator
   • Operational characteristics of a marine alternator are outlined
   • Excitation and automatic voltage regulation systems used with marine alternators are clarified
9. Explain procedures for paralleling of alternators
   • Process of measuring voltage, frequency and phase angle is outlined
   • Automatic and manual procedures for synchronising and paralleling marine alternators, including machines of different capacities are clarified
   • How two machines can be adjusted to share kVAR and kW loads is confirmed
   • Process of removing an alternator from the bus is outlined

Range Statement

Specifies different work environments and conditions that may affect performance. Essential operating conditions that may be present (depending on the work situation, needs of the candidate, accessibility of the item, and local industry and regional contexts) are included. Range is restricted to essential operating conditions and any other variables essential to the work environment.
Electrical hazards include one or more of the following:	electric shock electrical fire moving and rotating electrical equipment non-compliance with safe working procedures over-speed of electrical machinery poor housekeeping procedures using equipment beyond safe working limits

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Performance Evidence

Evidence required to demonstrate competence in this unit must be relevant to and satisfy all of the requirements of the elements and performance criteria on at least one occasion and include:

assessing own work outcomes and maintaining knowledge of current codes, standards, regulations and industry practices

explaining basic principles of alternators, generators and control systems

identifying and interpreting numerical and graphical information in electrical diagrams and specifications for a commercial vessel

identifying and suggesting ways of rectifying electrical hazards and emergency situations on a vessel

identifying methods, procedures and materials needed for operating, maintaining and repairing basic marine electrical systems

imparting knowledge and ideas through verbal, written and visual means

providing accurate and reliable information

providing appropriate level of detail in responses

reading and interpreting written information related to electrical circuitry and components on commercial vessels

using electrical measuring and testing instruments.

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Knowledge Evidence

Evidence required to demonstrate competence in this unit must be relevant to and satisfy all of the requirements of the elements and performance criteria and include knowledge of:

AC/DC voltage

alternators:

construction

characteristics

synchronised operation

electrical:

safe working practices

measuring and testing instruments

symbols, basic electrical diagrams/circuits

marine electrical systems:

switchboards

instrumentation

earthing

phase angle, power factor and current flow

procedures for dealing with hazards and emergencies

resistance, inductance and capacitance

switchboards and protection:

purpose

testing and maintenance

equipment removal

work health and safety (WHS)/occupational health and safety (OHS) legislation and policies.

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