Previous Year Question
An underground cable installation in an industrial facility requires both mechanical and electrical protection. Which combination of methods best ensures comprehensive protection for the cables?
Correct answer: A
Explanation
Armouring gives mechanical protection against crushing or impact, while an earth-leakage protective device provides electrical shock/fault protection. Together they address both required hazards.
Step-by-step solution
Correct Answer
A — Use of armored cables with earth leakage circuit breakers
Explanation
Armouring gives mechanical protection against crushing or impact, while an earth-leakage protective device provides electrical shock/fault protection. Together they address both required hazards.
Key Concept
Armouring and Earth-Leakage Protection
Exam Point
Mechanical protection = armour; leakage protection = ELCB/RCD.
Exam tip
Mechanical protection = armour; leakage protection = ELCB/RCD.
Quick method
Mechanical protection = armour; leakage protection = ELCB/RCD.