Practical Electricity Made Easy - ARB · 2020. 11. 12. · Practical Electricity Made Easy This...
Transcript of Practical Electricity Made Easy - ARB · 2020. 11. 12. · Practical Electricity Made Easy This...
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QUICK OVERVIEW Practical Electricity Made Easy
This guide provides assistance to electrical trainers and trainees in need of quick access to
information on the electrical subject. Simplified user-friendly advice and explanations are
presented with colour diagrams and photographs. Sections and text are laid out in a logical order
and sequence that facilitates learning and to ensure an electrically safe installation.
Electrical systems and equipment must be installed and maintained in accordance with the
manufacturer's instructions and have to comply with the requirements of the South African
National Bureau of Standards.
Treat electricity with respect, as it can be harmful or fatal when used incorrectly. Always think
safety first and test before you touch.
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ELECTRICIAN STATUS
There are pre-requisites to comply with,
prior to qualify as an Electrician.
One of these requirements is that a
person has to be assessed
(Trade Tested) at an Accredited
Trade Test Centre and be declared
competent as an Electrician.
“Practical Electricity Made Easy”
can be used as a guide during training
and during the Trade Test preparation
phase.
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The following
indicates the
Contents of
each Section
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Section 1Graphical symbols for
electrical wiring diagrams
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CONTENTS
➢ Foreword
➢ Preface & Disclaimer
➢ SECTION 1: GRAPHICAL SYMBOLS FOR ELECTRICAL WIRING DIAGRAMS
1.1 Symbols and descriptions
1.2 Application in the circuit
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Section 2Electrical measuring and
test instruments
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CONTENTS
➢ SECTION 2: ELECTRICAL MEASURING AND TEST INSTRUMENTS
2.1 General meters (Ammeter and voltmeter in high-and low voltage circuits)
2.2 Probe tester
2.3 Multi-meter (Amps, volts, ohms and audible) Continuity
2.4 Clamp-on meter
2.5 Insulation resistance tester
2.6 Earth leakage relay/polarity tester (Combined)
2.7 Earth resistance tester
2.8 PSC and earth loop impedance tester (Combined)
2.9 kWh energy meter (Single and three-phase)
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Section 3Simple circuits, diagrams
and controlling devices
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CONTENTS
➢ SECTION 3: SIMPLE CIRCUITS, DIAGRAMS AND CONTROLLING DEVICES
3.1 Design and wire a circuit
3.2 One-way, two-way and intermediate switching
3.3 Three-heat and five-heat stove switches
3.4 The basic contactor and relay unit (Operations, features & application as
switching devices)
3.5 Timing relays and time switches
3.6 Overload relays
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Section 4
Resistance circuit
calculations and load
balancing
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CONTENTS
➢ SECTION 4: RESISTANCE CIRCUIT CALCULATIONS AND LOAD BALANCING
4.1 Current and voltage in a circuit (Kirchhoff’s first and second law)
4.2 Resistors (Series, parallel and series-parallel)
4.3 Resistors/heating elements (Balanced and unbalanced)
4.4 Three-heat stove switch with resistors
4.5 Energy metering: (Supply authority/consumer)
4.6 Energy metering: (Connect different consumer loads)
4.7 Thermostat controlled load (Blast furnace)
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Section 5 Electrical motors
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CONTENTS
➢ SECTION 5: ELECTRICAL MOTORS
5.1 Induction motors
5.2 Rated specifications
5.3 Name plates and terminal connections
5.4 Motor protection and overload setting
5.5 Standard three-phase motor failures
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Section 6 Panel wiring (contactor control)
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CONTENTS
➢ SECTION 6: PANEL WIRING (CONTACTOR CONTROL)
6.1 Single-phase motor control (Forward/reverse)
6.2 Three-phase motor control (Forward/reverse)
6.3 Three-phase motor control (Sequence start)
6.4 Three-phase motor control (Star-Delta)
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Section 7Wiring of circuits
(rotary switch control)
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CONTENTS
➢ SECTION 7: WIRING OF CIRCUITS (ROTARY SWITCH CONTROL)
7.1 Single-phase motor control (Forward/reverse)
7.2 Three-phase motor control (Forward/reverse)
7.3 Dual speed motor control (Separate wound arrangement)
7.4 Dual speed motor control (Pole change)
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Section 8 Motor starters
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CONTENTS
➢ SECTION 8: MOTOR STARTERS
8.1 Direct on line (D.O.L)
8.2 Star-Delta (Manual)
8.3 Star-Delta (Semi-automatic)
8.4 Star-Delta (Automatic)
8.5 Dual speed (Pole change)
8.6 Auto-transformer
8.7 Slip ring (Resistors as resistance)
8.8 Slip ring (Liquid as resistance)
8.9 Forward/reverse Star-Delta
8.10 Electronic soft starters
8.11 Variable speed drives
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Section 9 Transformers
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CONTENTS
➢ SECTION 9: TRANSFORMERS
9.1 Distribution transformer (Single-phase)
9.2 Distribution transformer (Three-phase)
9.3 Transformer calculations
9.4 Neutral earth resistor and compensator (NER/NEC)
9.5 Auto-transformer
9.6 Current transformer (CT)
9.7 Voltage transformer (VT)
9.8 CTs and VTs combined in a circuit
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Section 10 Installation work
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CONTENTS
➢ SECTION 10: INSTALLATION WORK
10.1 Connected and estimated load
10.2 Distribution boards, accessories and components
10.3 Bending methods for electrical conduit (Bendable metallic and non-metallic)
10.4 Conduit and wiring accessories
10.5 Wiring of different electrical circuits
10.6 Wiring of a distribution board
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Section 11 Electrical tests
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CONTENTS
➢ SECTION 11: ELECTRICAL TESTS
11.1 Unknown resistor circuits (‘Mystery’ box)
11.2 Single and three-phase induction motors
11.3 Phasing of a three-phase induction motor
11.4 Installation inspections and tests (To comply with the Wiring Code SANS 10142-1)
11.5 Appliance inspections and tests
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Section 12Fault finding &
trouble shooting
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CONTENTS
➢ SECTION 12: FAULT FINDING AND TROUBLESHOOTING
12.1 Fault finding procedure
12.2 Troubleshooting on miniature circuit breakers and earth leakage units
12.3 Troubleshooting on electrical motors
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Section 13 Useful information
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CONTENTS
➢ SECTION 13: USEFUL INFORMATION
13.1 Tips for trade test
13.2 Quantities, symbols and SI units
13.3 SI Prefixes
13.4 Underground cables
13.5 Select and install cable glands
13.6 Select and install earth tags
13.7 Electricity consumption table
13.8 Industrial fasteners (Standard bolts, nuts, washers & screws)
13.9 SANS symbolic safety signs
13.10 Major first aid techniques
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Section 14 Summary
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CONTENTS
➢ SECTION 14: SUMMARY
14.1 Formulas
14.2 General
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