DOMESTIC WIRING PRACTICE - Quiz

1) What is the resistance value of earth continuity conductor?

Higher than 1 ohm to 10 ohm Should not be more than one ohm Greater than 10 ohm to 100 ohm Greater than 100 ohm

2) Which is the length of pipe electrode used for pipe earthing?

Not less than 1 m Not less than 1.5 m Not less than 2.0 m Not less than 2.5 m

3) What is the thickness of copper plate used for plate earthing?

Not less than 2.0 mm Not less than 2.5 mm Not less than 3.15 mm Not less than 6.5 mm

4) Which method is preferred to reduce the value of earth resistance?

By increasing the dia of pipe Connecting number of earth electrode in parallel By increasing the depth of earth pit By connecting insulated cables

5) Where system earthing is employed?

Commercial buildings Industries Generating station Domestic buildings