Inspection and Testing

What is the first step in the procedure for completing safe isolation of electrical circuits?

• Selecting correct test instruments

• Identification of circuit(s) to be isolated

• Warning notices

• Suitable testing methods

What is the primary purpose of initial verification of electrical installations?

• To reduce energy consumption

• To ensure compliance with standards

• To test equipment efficiency

• To minimise installation costs

Which of the following documents is NOT associated with the inspection, testing, and commissioning of an electrical installation?

• BS 7671

• IET Guidance Note 3

• HSE Guidance

• Building Regulations Part P

When inspecting electrical installations, which human sense can be used to identify overheating?

• Sight

• Smell

• Hearing

• Touch

What is the required test voltage for insulation resistance testing of circuits operating at 230V AC?

• 100V DC

• 250V DC

• 500V DC

• 1000V DC

Which tester is used to verify the continuity of protective conductors?

• Continuity Tester

• MFT

• Earth fault loop impedance test

• Low-resistance ohmmeter

What is the maximum permissible value for earth fault loop impedance (Zs) according to BS 7671 for a 32A Type B circuit breaker?

• 0.4 ohms

• 1.37 ohms

• 1.5 ohms

• 2.0 ohms

Which document should be referred to for the requirements of testing and commissioning electrical installations?

• BS 7671

• IET Guidance Note 3

• OSG

• All of the above

What is the correct sequence for testing electrical installations as per BS 7671?

• Continuity, Insulation resistance, Polarity, Earth fault loop impedance

• Polarity, Insulation resistance, Continuity, Earth fault loop impedance

• Insulation resistance, Polarity, Continuity, Earth fault loop impedance

• Continuity, Polarity, Insulation resistance, Earth fault loop impedance

What should be done if a diverted neutral current is detected during inspection?

• Ignore it

• Report it immediately

• Rectify the fault and retest

• Label the faulty circuit