Podcast
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?
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..
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..
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..
The maximum disconnection time for a circuit supplying 25 amp 3 phase socket outlets is..
The maximum disconnection time for a circuit supplying a hot water system is..
The maximum disconnection time for a circuit supplying a hot water system is..
The maximum disconnection time for a sub main circuit is..
The maximum disconnection time for a sub main circuit is..
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..
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..
Another name (acronym) for a device used to detect earth leakage current is..
Another name (acronym) for a device used to detect earth leakage current is..
What is the sensitivity mA rating for RCDs to provide additional protection against electric shock as per AS3000?
What is the sensitivity mA rating for RCDs to provide additional protection against electric shock as per AS3000?
What is the sensitivity or mA rating for RCDs that may be used in higher risk installations such as bathrooms and kindergartens?
What is the sensitivity or mA rating for RCDs that may be used in higher risk installations such as bathrooms and kindergartens?
What is a possible disadvantage of using a low setting (sensitivity) mA RCD?
What is a possible disadvantage of using a low setting (sensitivity) mA RCD?
Which of the following is NOT regarded as a damp situation in AS3000 requiring additional safety precautions?
Which of the following is NOT regarded as a damp situation in AS3000 requiring additional safety precautions?
The IP protection rating in AS3000 designates the degree of protection against.
The IP protection rating in AS3000 designates the degree of protection against.
The lower the number in the IP rating, the higher the degree of protection.
The lower the number in the IP rating, the higher the degree of protection.
Which Zone relates to the area immediately above a bath, shower base or pool?
Which Zone relates to the area immediately above a bath, shower base or pool?
The Zone with the lowest number has the highest degree of risk in a damp situation.
The Zone with the lowest number has the highest degree of risk in a damp situation.
What is the minimum distance above a sink?
What is the minimum distance above a sink?
Flashcards are hidden until you start studying
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.
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
