In cables, the thickness of the layer of insulation on the conductor depends upon

• A. Reactive Power
• B. Voltage
• C. Current carrying capacity
• D. Power Factor

Answer: (B)

For domestic wiring, the most extensively used conductor material is copper or aluminum. To prevent any leakage of current from the conductor and also to provide mechanical strength, it is surrounded by ar insulation and sheath. Normally, the cables are classified according to the insulation used over the conductor The selection of suitable cable for installation depends upon the following considerations:
(I) The nature of conditions under which the cable is to be used (for example, underwound, banging is air, in damp conditions, etc.). 
(ii) The operating voltage.
(iii) The current capacity of the installation.
The operating conditions decide the type of insulation and other protection needed around the conductor of the cable. The operating voltage determines the thickness of the insulation. The current capacity of the installation determines the cross-sectional area or size of the cable-conductor. The insulation should have high resistance, high dielectric strength, good mechanical strength and high temperature withstand capability.
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