Electrical Workshop Practice

Domestic Appliances

Advantages & Disadvantages of Electrical Energy

[ Construction, Working, Possible faults & their location And Maintenance of Commonly used appliances

• Electrical heater
• Storage water heater
• Electric toaster
• Hair dryer
• Microwave oven
• Room cooler
• Oven toaster griller ]

Calculation of rating of a water heater

Standard specifications of appliances available in the market

Purpose of using appliances

[ Components common to all appliances

• Various Insulating Materials
• Switches
• Timers
• Heating elements (with properties, required material)

]

Thermostats

Bells and Bell indicators

 

Motor used in appliances

General construction of these motors

Types of bushings and bearings

Necessity of earthing of the appliances

How a person is saved from getting an electric shock by providing earthing

Use of Megger for detecting various types of faults in appliances

Use of Multimeter for detecting various types of faults in appliances

Use of Series test lamp for detecting various types of faults in appliances

 

Fans

Types of Fans

Construction and Working of Table Fans

Construction and Working of Ceiling Fan

Standard specification of Fans

Method of Speed control in fans

Air movement at various places due to fans

Calculation of number of fans at given location

 

Illumination Fundamentals

Lux, Lumen and Factors Effecting illumination

Illumination elements at various places

Calculation of number of lamps at given situation

Construction and working of G.L.S (General Light Service)

Construction and working of Fluorescent lamp

Construction and working of Electronic choke

Calculation of lamps for resident and commercial locations

 

LED Lamps

Types of LED lamps

Advantages and Disadvantages of LED lamp

 

Wiring

Electrical symbol as per IS for wiring

Simple Light circuits

Simple Fan circuits

Schematic & wiring diagrams

Wiring system & lopping systems

Staircase wiring

Godown wiring

 

Planning of Wiring Installation

Planning of wiring installation for small residence

Designing and drawing of electrical installation

Planning of switchboard for light and fan circuits using dimensions

Preparing Material List for Wiring

 

Wiring Accessories

Switching devices

Protecting devices

Terminating devices

Miscellaneous devices

Types of wires

Methods of wiring

Wooden wiring

PVC casing & Capping

PVC batten wiring

Concealed wiring

Surface conduit wiring

Procedure of all these wiring methods

Factors to be considered for selecting wiring methods

Comparison of wiring methods

Testing of wiring

 

Special Appliances

Microwave oven

Washing machine

Emergency lighting system

Uninterrupted power supply ( UPS )

Calculation of Battery capacity