Domestic Installations: Sub-Circuits & Testing is one of 9 topics in the Grade 10 Electrical Technology CAPS syllabus, covered across 3 lessons on Study Vault. Below are real practice questions from this topic with full worked answers.
Sample practice questions
Easy
1. What does an earth leakage protective device continuously compare?
The current flowing out through the live conductor against the current returning through neutral
The total power consumption of the entire installation
The voltage at the distribution board against the voltage at the furthest socket outlet
The resistance of the earth spike against the resistance of the neutral conductor
Answer: The current flowing out through the live conductor against the current returning through neutral — An earth leakage protective device continuously compares current flowing out through the live conductor against current returning through neutral; an imbalance indicates leakage and trips the device.
Easy
2. What is the earth spike used for?
A metal rod driven into the ground to provide the actual physical connection to earth
Protecting an installation from lightning strikes only
Measuring the total resistance of the entire electrical installation
Joining two conductors together inside a connector box
Answer: A metal rod driven into the ground to provide the actual physical connection to earth — The earth spike is a metal rod driven into the ground to provide the actual physical connection to earth.
Medium
3. Name the country where the modern earth leakage relay was developed, a significant contribution recognised in this CAPS content.
Answer: South Africa — The modern earth leakage relay was developed in South Africa, a genuinely significant local contribution to global electrical safety practice.
