Re-Testing to Electrical Standards

According to the diagram, what should be done if the earth wire is not present during the alternative current leakage test?

• Do not perform the test

• Use an alternative connection as shown in the diagram

• Increase the resistor value

• Connect both L and N to earth

True or False: The alternative current leakage test is valid only for appliances with an earth wire.

• True

• False

For hand tools and other portable appliances, what is the purpose of a flash test?

• To measure insulation resistance using a high voltage supply

• To check battery life

• To test the weight of the tool

• To measure temperature

It is recommended to apply the flash test frequently to hand tools and portable appliances.

• True

• False

If the appliance uses a transformer to generate a low voltage, what additional test must it pass?

• SELV/PELV test

• Insulation resistance test

• Earth continuity test

• Load regulation test

According to the International Electrotechnical Commission (IEC), which of the following is the safest type of low voltage power supply?

• Protected extra-low voltage (PELV)

• Functional extra-low voltage (FELV)

• Separated extra-low voltage (SELV)

• None of the above

The next safest type of low voltage power supply after SELV is _________

• protected extra-low voltage (PELV)

• direct current (DC)

• residual current device (RCD)

• isolated earth (IE)

Which type of low voltage power supply is considered the least safe according to the International Electrotechnical Commission (IEC)?

• Separated extra-low voltage (SELV)

• Protected extra-low voltage (PELV)

• Functional extra-low voltage (FELV)

• All are equally safe

What is the maximum output from a low voltage power supply?

• 25 V rms

• 10 V rms

• 50 V rms

• 100 V rms

A transformer is used to drop AC supply voltage to what value or below?

• 25 V rms

• 110 V rms

• 50 V rms

• 230 V rms