Which of the following is the **safest and most commonly used** wiring system for residential buildings?
B
Casing and capping wiring
Analysis & Theory
Conduit wiring is the most commonly used system today due to its safety, durability, and protection against mechanical damage.
In **conduit wiring**, where are the wires placed?
B
Inside PVC or metal pipes
D
Between two insulation sheets
Analysis & Theory
In conduit wiring, wires are run inside protective plastic or metal conduits for safety and neatness.
Which type of wiring is **cheapest** but used only for temporary installations?
B
Casing and capping wiring
Analysis & Theory
Cleat wiring is an open wiring system used for temporary purposes due to its low cost and ease of removal.
What is a **major disadvantage** of casing and capping wiring?
C
Low mechanical strength and prone to fire hazards
D
Not suitable for open spaces
Analysis & Theory
Casing and capping wiring uses wooden or PVC casing, which may deteriorate over time, and offers less protection from fire.
Which wiring system offers **maximum protection** against fire, moisture, and corrosion?
C
Casing and capping wiring
Analysis & Theory
Conduit wiring, especially using metal conduits, provides excellent protection against fire, moisture, and physical damage.
Which type of wiring system uses **PVC casing with a top cap** to hold the wires inside?
B
Casing and capping wiring
Analysis & Theory
Casing and capping wiring uses wooden or PVC casing where wires are laid inside and covered with a cap.
Which wiring type involves running **bare or insulated wires** on porcelain holders attached to walls or ceilings?
B
Casing and capping wiring
Analysis & Theory
Cleat wiring uses cleats (porcelain holders) to hold wires in place, suitable only for temporary installations.
Which type of wiring is **not preferred** nowadays due to health and environmental hazards?
A
Casing and capping wiring
Analysis & Theory
Lead sheathed wiring involves wires covered with lead, which poses environmental and health risks.
In conduit wiring, which is **not** a valid advantage?
C
Easy to modify after installation
Analysis & Theory
Conduit wiring offers a neat appearance; it is not untidy. It is durable, safe, and fire-resistant.
Which type of wiring is most suitable for **industrial or commercial installations** where safety is critical?
A
Casing and capping wiring
Analysis & Theory
Conduit wiring is preferred in commercial and industrial areas due to its mechanical and environmental safety.