Domestic wiring refers to wiring done in homes to provide electrical power for lighting, fans, and appliances while ensuring safety. Key factors that affect the choice of wiring include durability to withstand weather and fumes, electrical safety to prevent shocks and fires, appearance, cost effectiveness based on the building type and purpose, accessibility of switches and plug points, low maintenance costs, and protection against mechanical damage. Common aspects of domestic wiring systems that are discussed include 3-phase power, service mains, meter boards, distribution boards, concealed and multi-way circuit wiring, overcurrent protection devices, earthing, and residual current circuit breakers.

3. DOMESTIC WIRING
Domestic wiring may be defined as:
Wiring done in domestic premises (houses), for providing
electrical power for lighting, fans and domestic appliances
with all the safety precautions followed is called domestic
wiring.

4. Factors Affecting The Choice Of
Wiring
• Durability: Type of wiring selected should conform to standard
specifications, so that it is durable i.e. without being affected by
weather conditions, fumes etc.
• Electrical Safety: The wiring must provide safety against leakage,
shock and fire hazards for the operating personnel.
• Appearance: Electrical wiring should give an aesthetic appeal to the
interiors.
• Cost: It should not be prohibitively expensive i.e. the system chosen
should depend upon the type of building and the purpose for which it
is used, keeping economy in view.

5. • Accessibility: The switches and plug points provided should be
accessible and there must be provision for further extension of
the wiring system, if necessary.
• Maintenance Cost: The maintenance cost should be minimum.
• Mechanical Safety: The wiring must be protected against any
mechanical damage.

6. 1. Introduction to 3-
phase, 4-wire system
2. Service Mains
3. Meter Board and
Distribution Boards
4. Concealed wiring
5. 2-way control lamp
6. 3-way Control Lamp
7. Fuses
8. MCB’s
9. Electric Shock
10. Earthing
11. RCCB