Sem2 Mod3 Wiring Installation and Earthing

What is the minimum size of Copper earth continuity conductor used in single phase domestic wiring as per BIS?

• 3 Sq. mm

• 3.5 Sq. mm

• 2.5 Sq. mm

• 1.5 Sq. mm

Which method is used to reduce earth resistance value in a existing earth?

• Increasing the length of electrode

• Keeping wet condition in earth pits always

• Adding more sand and charcoal in earth pits

• Increasing the diameter of earth electrode

Why A.C is required to measure the earth resistance by using earth resistance tester?

• Regulate the current

• Increase the voltage drop

• Decrease the voltage drop

• Avoid electrolytic emf interference

What is the formula to find voltage drop of a A.C single phase wiring circuit?

• Voltage drop = IR volt

• Voltage drop = I²R volt

• Voltage drop = I/R volt

• Voltage drop=IR/2 volt

What is the maximum permissible load for a power sub circuit as per I.E rules?

• 800 Watt

• 1500 Watt

• 2000 Watt

• 3000 Watt

Which location the service connection supply leads to be connected at consumer main board?

• IC cut out

• Main switch

• Energy meter

• Distribution board

What is the permissible leakage current in domestic wiring installation?

• 1/5 x Full load current

• 1/50 x Full load current

• 1/500 x Full load current

• 1/5000 x Full load current

Which formula is used to calculate the diversity factor?

Which instrument is used to test new domestic wiring installation?

• Multimeter

• Megger

• Shunt type ohmmeter

• Series type ohmmeter

What is the type of test in the wiring installation?

• Polarity test

• Open circuit test

• Insulation resistance test between conductors

• Insulation resistance test between conductors and earth