Define conductivity of a material. (b) According to I.E.E. regulations, state the allowable space factor for conduit and trunking. (c) State three advantages of PVC conduit wiring over surface wiring.

Here are the answers to your questions:

2. (a) Define conductivity of a material.
Conductivity is a measure of a material's ability to conduct an electric current or heat. Materials with high conductivity allow electric charge or heat to flow through them easily.

2. (b) According to I.E.E. regulations, state the allowable space factor for the following wiring systems:

• (i) Conduit: The allowable space factor for conduit is 40%.
• (ii) Trunking: The allowable space factor for trunking is 45%.

2. (c) State three advantages of PVC conduit wiring system over surface wiring system.

• Provides better protection against mechanical damage.
• Offers a more aesthetically pleasing installation as wires are concealed.
• Protects wires from moisture, dust, and chemical corrosion.

3. (a) State one application of a d.c.:

• (i) shunt generator: Used for battery charging.
• (ii) series generator: Used as a booster in distribution systems.