Soalan Pendawaian Elektrik

What is the standard color for the neutral conductor in a single-phase electrical wiring system in Malaysia?

• Red

• Blue

• Yellow

• Green-yellow

What is the main function of the main switch in a single-phase distribution board?

• To control only the lights

• To disconnect the entire electrical supply

• To reduce the supply voltage

• To convert alternating current to direct current

What is the nominal voltage of single-phase electrical supply in Malaysia?

• 110 V

• 230 V

• 415 V

• 500 V

What is the use of PVC insulated copper conductor cable in single-phase wiring?

• For high voltage current

• For internal house wiring

• For long-distance electrical transmission

• For earth connection only

What device is used to protect the circuit from overload current?

• Voltmeter

• MCB

• Multimeter

• Insulator

What is the function of the green-yellow cable in electrical wiring?

• Phase

• Neutral

• Earth

• Voltage level

What type of earthing system is commonly used for single-phase wiring in Malaysia?

• TT

• TN-S

• IT

• DC

What equipment is used to detect current leakage to the earth?

• MCB

• RCD / ELCB

• Fuse

• MCCB

In wiring work, why is insulation testing of cables necessary?

• To ensure the cable does not break

• To test the mechanical strength of the cable

• To prevent current leakage

• To ensure sufficient voltage

What is the first action before starting electrical wiring work?

• Install the cable first

• Turn off the electrical supply

• Check the load connections

• Install the MCB