EL03 Quiz 4: Protection Against Indirect Contact

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Questions and Answers

What is the name of the current that flows through a body when exposed to a touch voltage due to a fault?

Fault current

Normal current

Simultaneous current

Touch current (correct)

Automatic disconnection of supply is required to..

Only disconnect if fault conditions remain after 4 seconds

Automatically disconnect the supply if touch voltage exceeds 50VAC or 120VDC (correct)

Ensure no touch voltages at all occur on exposed conductive parts

Maximise the amount of touch voltage in the event of a fault to ensure fault conditions remain

The maximum disconnection time for a circuit supplying hand held class 1 equipment is..

5 seconds

0.5 seconds

0.4 seconds (correct)

4 seconds

Must be instantaneous, i.e. Zero seconds

The maximum disconnection time for a circuit supplying 25 amp 3 phase socket outlets is..

0.4 seconds Signup and view all the answers

The maximum disconnection time for a circuit supplying a hot water system is..

5 seconds Signup and view all the answers

The maximum disconnection time for a sub main circuit is..

5 seconds Signup and view all the answers

A device that is used to detect leakage current to earth (such as a person receiving an electric shock) and then disconnect the supply to prevent harm is called..

Residual Current Device Signup and view all the answers

Another name (acronym) for a device used to detect earth leakage current is..

ELCB Signup and view all the answers

What is the sensitivity mA rating for RCDs to provide additional protection against electric shock as per AS3000?

30mA Signup and view all the answers

What is the sensitivity or mA rating for RCDs that may be used in higher risk installations such as bathrooms and kindergartens?

10mA Signup and view all the answers

What is a possible disadvantage of using a low setting (sensitivity) mA RCD?

It may cause nuisance tripping due to small leakage in equipment Signup and view all the answers

Which of the following is NOT regarded as a damp situation in AS3000 requiring additional safety precautions?

A garden tap Signup and view all the answers

The IP protection rating in AS3000 designates the degree of protection against.

Solid objects and water Signup and view all the answers

The lower the number in the IP rating, the higher the degree of protection.

False Signup and view all the answers

Which Zone relates to the area immediately above a bath, shower base or pool?

Zone 1 Signup and view all the answers

The Zone with the lowest number has the highest degree of risk in a damp situation.

True Signup and view all the answers

What is the minimum distance above a sink?

The minimum distance above a sink should be specified in electrical safety regulations. Signup and view all the answers

Study Notes

Protection Against Indirect Contact

Touch current is the flow of electricity through a body induced by exposure to touch voltage from faulty equipment.
Automatic disconnection of supply is crucial to prevent touch voltages on conductive parts.
Maximum disconnection time for circuits supplying handheld Class 1 equipment is 0.4 seconds.
For 25 amp three-phase socket outlets, the maximum disconnection time is also set at 0.4 seconds.
Hot water systems and sub main circuits share the same maximum disconnection time of 0.5 seconds.
Residual Current Devices (RCDs) detect leakage current to earth and automatically disconnect supply to ensure safety.
Earth Leakage Circuit Breakers (ELCBs) serve as another name for devices that monitor earth leakage current.
RCD sensitivity ratings include 30mA for general protection against shocks, while 10mA is recommended for higher-risk areas such as bathrooms and kindergartens.
Low sensitivity RCD settings may lead to nuisance tripping, disconnecting supply unnecessarily due to small leakage currents.
AS3000 standards identify specific damp situations that require enhanced safety measures; a garden tap is not considered one.
The IP (Ingress Protection) rating signifies protection levels against solid objects and water; a higher number indicates lower protection.
Zone 1 refers to areas directly above baths and showers, representing a high risk of electric shock in damp environments.
The lowest numbered zone indicates the highest level of risk related to moisture exposure.
Safety standards dictate a minimum clearance above sinks to prevent electrical hazards.

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Description

Test your understanding of protection against indirect contact in electrical installations. This quiz assesses your knowledge on arranging circuits, control, and protection measures. Achieve a perfect score and enhance your skills in electrical safety.