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Questions and Answers
What is the purpose of electrical safety devices?
What is the purpose of electrical safety devices?
- To increase electricity consumption
- To make electricity usage more dangerous
- To reduce the lifespan of machinery/appliances
- To prevent fire and electrocution (correct)
What do over-current protective devices do?
What do over-current protective devices do?
- Increase the current capacity of the line
- Protect against wiring and transformer damage
- Cut off the line when current capacity is exceeded (correct)
- Allow for abnormal voltage to occur
What do protective devices prevent?
What do protective devices prevent?
- Abnormal voltage, overloading, wiring and transformer damage, and accidental contact with damaged equipment (correct)
- Normal voltage, underloading, wiring and transformer damage, and intentional contact with damaged equipment
- Normal voltage, underloading, wiring and transformer damage, and accidental contact with damaged equipment
- Abnormal voltage, overloading, wiring and transformer damage, and intentional contact with damaged equipment
Which type of circuit protective device is the simplest and most common?
Which type of circuit protective device is the simplest and most common?
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What should the fuse rating be equal to?
What should the fuse rating be equal to?
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What is the main difference between fuses and circuit breakers?
What is the main difference between fuses and circuit breakers?
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Why is the circuit breaker position easier to detect than a busted fuse?
Why is the circuit breaker position easier to detect than a busted fuse?
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Study Notes
- Electrical safety devices are important to prevent fire and electrocution.
- Over-current protective devices cut off the line when current capacity is exceeded.
- Protective devices prevent abnormal voltage, overloading, wiring and transformer damage, and accidental contact with damaged equipment.
- Fuses are the simplest and most common type of circuit protective device.
- Fuse rating should be equal to the maximum current rating of machinery/appliances in the circuit.
- Circuit breakers do the same job as fuses but are not destroyed when activated.
- Circuit breakers are equipped with an automatic tripping device to protect against overload and ground fault.
- Circuit breakers can act as a switch and protect/switch up to three lines.
- Fuses are cheaper, but circuit breakers are considered safer.
- Circuit breaker position is easier to detect than a busted fuse.
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