QUESTION 2

Draw the following

• Star delta starter

• Direct on line (Main and Control
• Generator
• Forward Reverse Starter
• Delta connection
• Polarised capacitor
• Photo resistor
• Variable conductor
• Iron core
• Mechanical relay
• Rheostat

Define the following

• Timer switch
• Temperature switch
• Proximity switch
• Resistive load
• Non linear load
• Multifunction Safety Analyser
• One line schematic diagram
• Solenoid
• Overload relay
• Limit control
• Inductive load
• Continuity Testing
• Purpose of earth leakage circuit breaker

▪ Tools needed for construction of star delta

▪ Important of adding changes to the original drawings of
construction of three phase circuit after it has been
completed
▪ Components need to construct DOL
▪ Incident that might take place if electric conductor are de
energised
▪ Installation test
▪ Control circuit of a sequence march 2022
▪ Test to be conducted in order to determine whether the
conductor is broken or not
▪ Functioning of IPS
▪ Items to be inspected during evaluation process
▪ Power drawn by resistive load
▪ Items that must appear on component list
▪ Worksite procedures
▪ Procedure when using thumber test
▪ Items that most appear on one line Schematic diagram
▪ Test to be conducted using a multifunction safety analyser
▪ Test method
▪ Protective device installed in a motor
▪ E.g resistive
▪ Load test purpose
▪ Circuits you use to design DOL
▪ Earth leakage relay
▪ UPS
▪ Star configuration cycle
▪ Contactor
▪ Fuse
▪ Disadvantage of poor planning
▪ Important of completing drawings
▪ Passive function of a fuse
▪ Active function of a fuse
▪ Overload relay process

❖ Circuit breaker
❖ Normally closed contact
❖ Reason for planning a worksite
❖ Ways to draw electrical diagrams
❖ Basic components

QUESTION 3

• Factors to consider when selecting cables and conductors for 3phase medium voltage overhead supply
• Laws that guide the cleaning of debris and waste disposal after construction work has been done
• The height poles used to support overhead lines is influenced by various factors
• Test to be conducted on different stages of a construction process
• Details that must appear on inspection sheet
• Aspect contained in Eskom NDP that must be considered before any network planning is done
• Overhead lines conductors are too slack
• Overhead lines conductors are too tight
• Types of servitudes
• General spacing of residential areas electric poles
• The depth of the hole for low voltage poles
• In Rural areas?
• Function of stays
• When completing the project
• What does OHSA Stipulates with regards to the user of an electrical installation and the safety of conductor’s in his
or her premises
• Why H type pole preferred to be used
• When syringing conductive elements certain precaution measures should be taken
• Reason for conducting pre commissioning test on overhead supply
• Standard that must be adhered to when restoring terrain
• Electrical infrastructure that must be available in consumer house before electricity is supplied to the house
• Statutory requirements
• Factors to be taken into consideration when accessing the type of terrain
• Electrical parameters required (NRS)
• Categories of fundamental requirements for a cable when designing a medium voltage supply
• Weather influences the design of an electricity distribution network
• Why is it important to know what type of soil is found on a terrain
• OHSA?
• Local Authority requirements or by laws
• Activities to follow after the terrain has been assessed
• Factors which influence the spacing of poles when designing pole spacing
• How you would string conductor onto the poles
• How to connect stays
• Define risk assessment
• Test done on a completed overhead supply
• Wire ways
• Types of wire ways
• Municipal by laws
• Servitude
• You were granted a tender to erect a 3 phase medium voltage overhead supply to domestic house ,Activities that are
included
• Factors that you would consider when designing and marking the route for overhead distribution lines

❖ NDP
❖ Terrain
❖ Electricity supply by laws
❖ Reticulation as applied to eskom
❖ Activities of events that must be performed before finally connecting a 230 V cable between overhead
supply
❖ Information should appear on pre commission reports
❖ Signs
❖ Stay wire
❖ Draw vice
❖ Reason for erecting safety signs in the workplace
❖ Tools that are used to mark the route
❖ When assessing the terrain why would day ground be an obstacle for electrical contactor
❖ Precaution measures in which must be taken when erecting poles for overhead lines
 ❖ Factors that govern the distance between poles
❖ Codes
❖ Restore terrain
❖ Where meter box must be installed
❖ What do you think will happen if reticulation specification were not prescribed by Eskom
❖ Overhead lines
❖ Underground cable
❖ Reason why construction site needs to be restored to it original condition

QUESTION 4

Important piece that should be included in the floor plan

Cross sectional elevator
Site plans
Switchyard
Function of arcing horn in the switchyard
Legislation that must be consulted in order to obtain more
information regarding de energising for safety
Wiring Diagram of three phase three wire system
Important to identify and correlate components with building
plans and electrical diagram
When working on High voltage
Risk evaluation

Earth leakage relay

Insulation resistant between live and eath
Hipot tester
LCR Meter
Earth ground tester
Multimeter
Phase rotational meter
Important of testing dead installation
Legislation that deals with low voltage installation
Document that should be completed to prove that an
installation was inspected and tested

Why electricians should remove all jewellery when working

on live electrical installations
Requirements that are necessary to ensure that the inspection
and test are conducted on installation are effective
Calibration
Termination
Arcing horn
Electric shock
Dead
Hazard identification
Hipot tester
Wiring diagram

Highest voltage
Voltage drop
How to conduct voltage on load test
Reason of discharging stored energy on components
Legislation to consult when working with low voltage
CoC section for comments
Types of diagram that has legend attached showing the
meaning of each symbol
Components that are part of proper planning for testing and
inspection task
Socket outlet
Who has the authority to do inspection

Site plans usually show

During risk assessment
General Safety regulations
What to do if a test fail
Earth loop impendance test
Floor Plan
Item that test lead must be checked for
Clip on ammeter
Building plans
Consist of

Safety hazard before you start inspection

Impendance analyser
Substation
Test report
Distribution Board
Information of test
Electrical Bonding
When testing conductors for continuity
Measure the voltage between supply neutral and any external
to the installation
When conducting insulation resistance

Phasor riser diagram

Schematic diagram
Wiring diagram
Switchyard types
Earth loop impendance
Earth leakage clamp meter
Resistance on earth electrode
The proper operation of thermal magnetic and solid state
overload relays
Voltage drop test
Items that you would usually inspect before testing an
insulation
Good electrical test instrument.

QUESTION 5

Breakdown insulating material

When fault finding
Test by integration
Test with reference of flow chart
Test by isolation
Test by substitution
Test by comparison
Corrective measures you would take according a motor that
comes up slowly
Housekeeping and safety measures you will consider when
planning
Techniques that can be used to locate underground’s cable

Imbalance line voltage

Fault finding principle on three phase
Cause for transformer to overheat
Smoke
Di electric test
Guidelines when planning to maintain a 3 phase
The stove isolator has a voltage at supply side but no voltage
at load side
Element does not heat up
Stove cannot be regulated
Test that must be done on a transformer

Important of maintenance
Why is it important to know the age of a transformer
Splice kit resin when joining cable
Items that should be checked during maintenance
Causes and corrective …
The motor does not start
Ambitient temperature of the motor is above 40•
Poor motor ventilation
Transformer is overheating
Fault circuit indicators

General requirement of personnel that would undertake any

repair work
What would happen if generator at any of Eskom power
stations fail to generate due to a lack of maintenance
 QUESTION 6

Wind turbine in term of energy conversion

Power consumption
Amount to be paid
Factor that might be kept in mind when you properly size a
battery bank
Voltage drop calculations

Batteries
Charge controllers
Capacity of the battery
Autonomy
Rules to be considered when choosing the current wire size