What is the main purpose of earthing in electrical installations?

To ensure immediate discharge of electrical energy without danger.

Fill in the blank: Earthing is provided to avoid electric shock to human beings and to prevent the risk of ______ due to earth leakage current.

Fire

True or False: Rod earthing is suitable for areas with rocky soil.

False. Rod earthing is suitable for sandy areas.

Which of the following methods of earthing is most commonly used? A) Strip earthing B) Rod earthing C) Pipe earthing D) Plate earthing

C) Pipe earthing

Riddle: I connect to the ground and divert unwanted electrical charge to prevent shock. What am I?

Earthing system

What is the minimum cross-section of conductor that can be used for power wiring with aluminium cables?

2.5 mm²

Fill in the blank: The insulation resistance between the wiring and earth should be checked with all fuses and lamps ______.

On

True or False: The fuse rating should not exceed the normal full-load current of the motor.

True.

Which component must be placed near every motor installation? A) Circuit breaker B) Switch-fuse C) Transformer D) Relay

B) Switch-fuse

What is the purpose of testing the polarity of non-linked single pole switches?

To ensure correct wiring and functionality.

Riddle: I am essential for safety, ensuring no current escapes, while connecting equipment to the ground. What am I?

Earthing

Fill in the blank: The wire used for earthing conductors should be made of ______ or galvanized material.

Copper