SAQA All qualifications and part qualifications registered on the National Qualifications Framework are public property. Thus the only payment that can be made for them is for service and reproduction. It is illegal to sell this material for profit. If the material is reproduced or quoted, the South African Qualifications Authority (SAQA) should be acknowledged as the source.
SOUTH AFRICAN QUALIFICATIONS AUTHORITY 
REGISTERED UNIT STANDARD THAT HAS PASSED THE END DATE: 

Sketch and construct three-phase circuits as used in air-conditioning, refrigeration and ventilation installations 
SAQA US ID UNIT STANDARD TITLE
116464  Sketch and construct three-phase circuits as used in air-conditioning, refrigeration and ventilation installations 
ORIGINATOR
SGB Air-conditioning Refrigeration and Ventilation 
PRIMARY OR DELEGATED QUALITY ASSURANCE FUNCTIONARY
-  
FIELD SUBFIELD
Field 06 - Manufacturing, Engineering and Technology Manufacturing and Assembly 
ABET BAND UNIT STANDARD TYPE PRE-2009 NQF LEVEL NQF LEVEL CREDITS
Undefined  Regular  Level 3  NQF Level 03  8 
REGISTRATION STATUS REGISTRATION START DATE REGISTRATION END DATE SAQA DECISION NUMBER
Passed the End Date -
Status was "Reregistered" 		 2018-07-01  2023-06-30  SAQA 06120/18 
LAST DATE FOR ENROLMENT LAST DATE FOR ACHIEVEMENT
2024-06-30   2027-06-30  

In all of the tables in this document, both the pre-2009 NQF Level and the NQF Level is shown. In the text (purpose statements, qualification rules, etc), any references to NQF Levels are to the pre-2009 levels unless specifically stated otherwise.  

This unit standard does not replace any other unit standard and is not replaced by any other unit standard. 

PURPOSE OF THE UNIT STANDARD 
To enable a person working in the air conditioning, refrigeration or ventilation industry to:
  • Identify components used in the make-up of three-phase electrical circuits.
  • Identify the symbols used to represent these on electrical wiring diagrams.
  • Interpret three-phase circuits.
  • Construct three phase circuits. 
    		•

    LEARNING ASSUMED TO BE IN PLACE AND RECOGNITION OF PRIOR LEARNING 
  • Understanding of the fundamentals of electricity.
  • Sketch and construct single-phase circuits.
  • Knowledge of the operation of three-phase air conditioning, refrigeration and ventilation
  • equipment.
  • Apply and maintain safety in an electrical environment.
  • Use of tools and test instruments 
    		•

    UNIT STANDARD RANGE 
    Power supplies:
    Standard low voltage, three-phase-four-wire as used in Southern Africa.
    Loads:
    Resistive and inductive loads
    Motors and starters:
    Direct on line, Star-Delta, Part-wind motors and starters and solid state starters.
    Protection devices:
    Three-phase circuit breakers, three-phase earth leakage relays, overload protection devices, phase failure relays, phase rotation relays and over/under voltage relays.
    Electrical control panel accessories:
    Door interlocked isolators (plain and fused), neutral links, current transformers, running hour meters, Auto-off-manual selector switches
    Typical circuits:
    Circuits for 2, 4, 6 and 8 pole three-phase -single speed induction motors, including the following:
  • Fuses, circuit breakers, overloads, lock-out stops, isolators and typical controls.
  • Sequence starting arrangements via interlocks or timers.
  • Stop-start stations, multi-position switches, warning devices and meters.
  • Time clocks, delay-on and delay-off timers
  • Protection devices.
    Circuits for:
  • Heaters including control and protective devices.
  • Humidifiers. 
    		•

    Specific Outcomes and Assessment Criteria: 

    SPECIFIC OUTCOME 1 
    Identify symbols, components and loads. 

    ASSESSMENT CRITERIA     

    ASSESSMENT CRITERION 1 
    Switching devices as per range statement are identified and their symbols drawn. 

    ASSESSMENT CRITERION 2 
    Protective devices as per range statement are identified and their symbols drawn. 

    ASSESSMENT CRITERION 3 
    Three-phase motors as per range statement are identified and their symbols drawn. 

    ASSESSMENT CRITERION 4 
    Control instruments as per range statement are identified and their symbols drawn. 

    ASSESSMENT CRITERION 5 
    Electrical control panel accessories as per range statement are identified and their symbols drawn. 

    ASSESSMENT CRITERION 6 
    Resistive and inductive loads are defined and contrasted. 

    ASSESSMENT CRITERION 7 
    The importance of a correct electrical diagram is explained. 

    SPECIFIC OUTCOME 2 
    Sketch and interpret typical basic three-phase circuit diagrams. 

    ASSESSMENT CRITERIA     

    ASSESSMENT CRITERION 1 
    Circuit diagrams for the types of starters as per the range statement, including the protection and control devices are sketched. 

    ASSESSMENT CRITERION 2 
    Instructions are interpreted according to instructions. 

    ASSESSMENT CRITERION 3 
    Symbols used conform to international standards. 

    ASSESSMENT CRITERION 4 
    Circuit diagrams are sketched neatly and symmetrically. 

    ASSESSMENT CRITERION 5 
    Circuit diagrams are functional. 

    ASSESSMENT CRITERION 6 
    Circuit diagrams are correctly interpreted. 

    ASSESSMENT CRITERION 7 
    The advantages and disadvantages of the various methods of starting three-phase motors are listed and discussed. 

    ASSESSMENT CRITERION 8 
    The purpose of the control devices is explained. 

    SPECIFIC OUTCOME 3 
    Construct typical basic three-phase circuit diagrams. 

    ASSESSMENT CRITERIA     

    ASSESSMENT CRITERION 1 
    Different circuits as per the range are constructed. 

    ASSESSMENT CRITERION 2 
    Components required are selected taking cognizance of load and fault current requirements. 

    ASSESSMENT CRITERION 3 
    Components are suitable and correctly connected according to diagram. 

    ASSESSMENT CRITERION 4 
    All wiring is done in accordance with work site instructions. 

    ASSESSMENT CRITERION 5 
    Correct wire sizes are used. 

    ASSESSMENT CRITERION 6 
    Circuit is correctly connected to the power supply. 

    ASSESSMENT CRITERION 7 
    Operation of the circuit is correct as intended. 

    ASSESSMENT CRITERION 8 
    No damage or injury occurred. 

    ASSESSMENT CRITERION 9 
    Tools are correctly used. 

    SPECIFIC OUTCOME 4 
    Convert any electrical line diagram to a drawing complying with international standards. 

    ASSESSMENT CRITERIA     

    ASSESSMENT CRITERION 1 
    All components are marked with the correct symbols. 

    ASSESSMENT CRITERION 2 
    The power and control circuits are separated from one another. 

    ASSESSMENT CRITERION 3 
    The circuit is drawn in its sequence of operation. 

    ASSESSMENT CRITERION 4 
    The electrical line diagram is correctly converted. 

    ASSESSMENT CRITERION 5 
    The advantages of diagrams complying with international standards is explained. 

    SPECIFIC OUTCOME 5 
    Complete the task. 

    ASSESSMENT CRITERIA     

    ASSESSMENT CRITERION 1 
    Work area is cleaned in accordance with housekeeping standards. 

    ASSESSMENT CRITERION 2 
    All tools are stored in their correct place in accordance with work place practices and manufacturer's specification. 

    ASSESSMENT CRITERION 3 
    Waste materials are disposed of according to work site procedures. 

    ASSESSMENT CRITERION 4 
    Documentation is completed in detail and submitted. 

    ASSESSMENT CRITERION 5 
    Arrangements are made for the work to be verified, certified and tested by an accredited person in accordance with SANS 10142-1. 


    UNIT STANDARD ACCREDITATION AND MODERATION OPTIONS 
    Any person wishing to be assessed against this unit standard may apply to an assessment agency, assessor or provider institution accredited by the relevant ETQA, who may appoint a moderator to be present at the assessment.
    The assessor must have knowledge and experience of electrical as applied to air-conditioning, refrigeration and ventilation. 

    UNIT STANDARD ESSENTIAL EMBEDDED KNOWLEDGE 
    Safe working practices.
    Operation of three phase motors and their starting methods.
    Knowledge about three-phase electrical components and accessories and how they function in electrical circuits.
    Reasons for and methods of controlling and protecting electrical circuits and equipment.
    Knowledge about electrical control panel construction.
    Interpretation of three-phase electrical circuits.
    Converting line diagrams 

    UNIT STANDARD DEVELOPMENTAL OUTCOME 
    N/A 

    UNIT STANDARD LINKAGES 
    N/A 


    Critical Cross-field Outcomes (CCFO): 

    UNIT STANDARD CCFO IDENTIFYING 
    Identify and solve problems
  • Identifying electrical components and accessories
  • Maintain safety whilst working with electricity. 
    		•

    UNIT STANDARD CCFO ORGANISING 
    Organize and manage myself and my activities responsibly and effectively
  • Selecting required components and planning construction of circuits. 
    		•

    UNIT STANDARD CCFO COLLECTING 
    Collect, analyse, organise and critically evaluate information.
  • Interpretation of electrical power and control diagrams. 
    		•

    UNIT STANDARD CCFO COMMUNICATING 
    Communicate effectively
  • By oral or written reporting.
  • Explaining the operating sequence. 
    		•

    UNIT STANDARD CCFO SCIENCE 
    Use science and technology effectively and critically
  • By understanding the principles of electricity involved 
    		•

    UNIT STANDARD ASSESSOR CRITERIA 
    N/A 

    REREGISTRATION HISTORY 
    As per the SAQA Board decision/s at that time, this unit standard was Reregistered in 2012; 2015. 

    UNIT STANDARD NOTES 
    Supplementary information:

    Specific requirements regarding the installation and operation of electrical equipment and accessories are contained in one or more of the following documents:
  • Manufacturer's instructions
  • Company procedures and guidelines.
    Circuits to be constructed in a simulated environment and tested under supervision.
    Only commonly applied electrical equipment and control devices are to be included.

    Any person learning towards the National Certificate in Air-conditioning, Refrigeration and Ventilation at NQF level 3 shall not work on electrical equipment or electrical control panels unless such person has been assessed competent in the unit standards on NQF levels 2 and 3 involving electrical work on such equipment or control panels and feels confident and comfortable to carry out such work. 
    		•

    QUALIFICATIONS UTILISING THIS UNIT STANDARD: 
      ID QUALIFICATION TITLE PRE-2009 NQF LEVEL NQF LEVEL STATUS END DATE PRIMARY OR DELEGATED QA FUNCTIONARY
    Core  48963   National Certificate: Air-Conditioning, Refrigeration and Ventilation  Level 3  NQF Level 03  Passed the End Date -
    Status was "Reregistered"     		 2009-03-12  Was MERSETA until Last Date for Achievement 
    Core  65509   Further Education and Training Certificate: Air-conditioning, Refrigeration and Ventilation  Level 4  NQF Level 04  Passed the End Date -
    Status was "Reregistered"     		 2023-06-30  MERSETA 


    PROVIDERS CURRENTLY ACCREDITED TO OFFER THIS UNIT STANDARD: 
    This information shows the current accreditations (i.e. those not past their accreditation end dates), and is the most complete record available to SAQA as of today. Some Primary or Delegated Quality Assurance Functionaries have a lag in their recording systems for provider accreditation, in turn leading to a lag in notifying SAQA of all the providers that they have accredited to offer qualifications and unit standards, as well as any extensions to accreditation end dates. The relevant Primary or Delegated Quality Assurance Functionary should be notified if a record appears to be missing from here.
     
    NONE 


    All qualifications and part qualifications registered on the National Qualifications Framework are public property. Thus the only payment that can be made for them is for service and reproduction. It is illegal to sell this material for profit. If the material is reproduced or quoted, the South African Qualifications Authority (SAQA) should be acknowledged as the source.