GSH Electrical - Continuity, Polarity & IR 2 way lighting

What is the first test conducted in the sequence for basic lighting circuits?

• Voltage drop test

• Continuity of CPC and polarity test

• Functional testing

• Insulation resistance test

Which scale is used on the Megger MFT for the continuity test?

• Orange ohm scale

• Volt scale

• Blue resistance scale

• Green ampere scale

What is the purpose of linking the crocodile clips during the setup?

• To increase the current flow

• To remove the resistance of the link

• To check the functionality of the clips

• To measure voltage across the clips

At which point in the circuit is the highest resistance reading expected?

• At the intermediate switch

• At the lighting point

• At the consumer unit

• At the circuit breaker

What does R1 represent in the test readings?

• Resistance of the CPC

• Resistance of the line conductor

• Capacitance of the circuit

• Resistance of the neutral conductor

What does the continuity of CPC test combine with to ensure circuit integrity?

• Capacitance checking

• Resistance measurement

• Polarity testing

• Voltage testing

What must be done before starting the insulation resistance test?

• Increase the voltage to 1000 volts

• Remove all loads and sensitive devices

• Disconnect the earth bar

• Turn off all switches

What is the minimum acceptable insulation resistance reading for a new installation?

• Greater than 999 mega ohms

• Greater than 50 mega ohms

• Greater than 1 mega ohm

• Greater than 100 ohms

Why is it necessary to throw two-way switches into the opposite on position during the test?

• To increase the current flow through the circuit

• To reduce the resistance in the circuit

• To ensure all parts of the circuit are tested

• To test the durability of the switches

What is the final step before the circuit goes live?

• Repeating the insulation resistance test

• Ensuring all covers are reinstalled

• Checking the functionality of the switches

• Conducting a voltage drop test