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?
Automatic disconnection of supply is required to..
The maximum disconnection time for a circuit supplying hand held class 1 equipment is..
The maximum disconnection time for a circuit supplying 25 amp 3 phase socket outlets is..
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The maximum disconnection time for a circuit supplying a hot water system is..
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The maximum disconnection time for a sub main circuit is..
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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..
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Another name (acronym) for a device used to detect earth leakage current is..
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What is the sensitivity mA rating for RCDs to provide additional protection against electric shock as per AS3000?
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What is the sensitivity or mA rating for RCDs that may be used in higher risk installations such as bathrooms and kindergartens?
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What is a possible disadvantage of using a low setting (sensitivity) mA RCD?
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Which of the following is NOT regarded as a damp situation in AS3000 requiring additional safety precautions?
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The IP protection rating in AS3000 designates the degree of protection against.
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The lower the number in the IP rating, the higher the degree of protection.
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Which Zone relates to the area immediately above a bath, shower base or pool?
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The Zone with the lowest number has the highest degree of risk in a damp situation.
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What is the minimum distance above a sink?
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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.
