3003 LO4 07 Safety devices

Would you get an electric shock if you touched both the secondary output wires of an isolating transformer?

• Yes, you create a current path through your body, which can cause an electric shock.
• No, you would not get an electric shock because the secondary output wires are not connected to the mains.
• No, the isolating transformer eliminates the risk of electric shock.

Should an isolating transformer be plugged in before or after an extension lead?

• Before the extension lead so that it protects the extension lead as well.
• After the extension lead so that the extension lead can protect the transformer.
• It doesn't matter where the isolating transformer is plugged in.

What are portable RCDs designed to do when the power is lost?

• Switch off.
• Continue to deliver power and operate normally.
• Activate a warning light.
• Reset and restore power once the supply is restored.

What two things must you check before using an extension lead?

• Check that it has the correct current rating for the job. This is not usually printed on the lead so you will have to get an idea from the rating of the plugs and size of cable.
• Check along the length for any nicks, wear or damage. If you find any issues, don’t use it, label it as defective and/or if appropriate, give it to your supervisor.
• Check that the extension lead is made by a reputable brand.
• Check that the extension lead is the same colour as the appliance you are using it with.
• Verify the extension lead's compatibility with water exposure, ensuring it is suitable for use in wet environments.

Which standard sets out a testing regime that can be used to monitor the condition of electrical equipment with a supply cord, and used in a place of work, public place or offered for hire?

• AS/NZS 3760
• AS/NZS 5761
• AS/NZS 5762
• AS/NZS 3000

What reference sets out the requirements for electrical protection in the form of isolating transformers and RCDs?

• AS/NZS 4836 8.3.2
• AS/NZS 3000 1.4.31
• AS/NZS 3000 1.4.32
• AS/NZS 3000 1.4.33
• AS/NZS 4836 8.4.1

If you stand on the ground and touch either one of the live isolating transformer output wires, why will you not get a shock?

• Because the transformer separates you from the electrical supply earthing system.
• Because the transformer has a high-impedance winding.
• Because the voltage of the live wire is too low to cause a shock.
• Because transformers only carry harmless currents.

Is the following statement about an extension lead true or false? You should not wind the lead on your arm - it put twists into the lead that can become a real nuisance and the coils will be too small.

• Yes
• No

What does the test tag on an appliance tell you?

• That at the time of testing the equipment was in safe condition.
• That the appliance is safe to use even if it is not properly maintained.
• That the appliance is safe to use even if it is damaged.
• That the appliance is safe to use forever.