
RCD and Circuit Protection
Flashcard
•
Physics
•
Vocational training
•
Hard
Mark Frost
FREE Resource
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11 questions
Show all answers
1.
FLASHCARD QUESTION
Front
What does an RCD detect?
Back
An RCD detects imbalance in the currents of the supply and neutral conductors of a circuit.
2.
FLASHCARD QUESTION
Front
Can an RCD protect against overcurrent or short circuit?
Back
No, an RCD cannot protect against overcurrent (overload) or short circuit like a fuse or a miniature circuit breaker (MCB) does, except for the special case of a short circuit from live to earth.
3.
FLASHCARD QUESTION
Front
What is the primary function of an RCD?
Back
The primary function of an RCD is to prevent electric shock by breaking the circuit when it detects an imbalance between the live and neutral currents.
4.
FLASHCARD QUESTION
Front
How does an RCD differ from a circuit breaker?
Back
An RCD is designed to detect earth faults and protect against electric shock, while a circuit breaker is designed to protect against overcurrent and short circuits.
5.
FLASHCARD QUESTION
Front
Can an RCD provide protection against electrical fires?
Back
Yes, an RCD can help prevent electrical fires by detecting earth faults that could lead to overheating and ignition.
6.
FLASHCARD QUESTION
Front
What is the difference between an RCD and an RCCB?
Back
An RCD (Residual Current Device) and an RCCB (Residual Current Circuit Breaker) are essentially the same, both designed to detect earth faults and prevent electric shock. The term RCCB is often used to emphasize the circuit-breaking capability.
7.
FLASHCARD QUESTION
Front
How often should RCDs be tested?
Back
RCDs should be tested every three months by pressing the test button to ensure they are functioning correctly. This is to verify that the device can trip and cut off the power supply in case of a fault.
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