Q. What precautions should we taken in electrical works?
Following precautions/practices would be helpful from safety and quality points of view -
1. Always buy electrical items, which carry ISI mark.
2. Identify locations for switch boards in advance so that they would not obstruct while decorating rooms.
3. Proper earthing should be done for the entire house.
4. Proper class of wiring should be done.
5. Each power board should have separate fuse.
6. Registered electrical contractors should be engaged for carrying out electrical works.
7. Consumption of electricity should be need based. Try to save electricity as much as possible. The entire network and materials should be designed to avoid unnecessary/excess power losses during transmission.
Q. How to prevent accidental shocks?
Use of RCCB/ ELCB (Residual current circuit breaker/ Earth Leakage circuit breaker) prevents the accidental shocks and also keep a check on the earthing system of the house. In case of leakage of very small current in milli-amperes would trip the circuit and prevent the mishap.
Q. What are single phase and three phase systems?
Single Phase System - It consists of one phase wire, a neutral wire and earthing wire. It is commonly used for domestic purposes.
Three Phase System - It consists of three phase wires and an earthing wire and is used for industrial and commercial purposes.
Q. Why is earthing required?
Earthing is required to by-pass the over-rated current caused due to fluctuation in circuit parameters such as phase frequency and line voltage etc., to save human life and electrical assets from short circuits.
Q. What is a fuse wire/switch?
Fuse is a conditional switch having fuse wire of low melting point required to save the electrical network in case of overloads and short circuits.
Q. How do we pay for the electricity consumed by us?
Electricity is measured in terms of kilo Watt Hour and tariff is decided on that basis. Hence, kilo Watt Hour is a unit of consumption of electricity. Thus, electrical equipment, which consumes 1 Kilowatt, will cost you one unit if the same is used for one hour.
Q. What is short circuit?
Short circuit occurs due to accidental contact of phase with another phase or phase with neutral or phase with earth wire.
Q. Why is it required to provide MCB in the house wiring?
It is a magnetic tripping device working during short circuit or overloading. It is mainly used to protect life and other electrical assets.
Q. Is concealed wiring safe for a building?
Concealed wiring is safe for the building as long as it is properly placed and joints are properly covered. There should be tap holes for checking the wiring at suitable intervals. The wiring should not be too close to the slab and also from the water bodies in the building. The wiring should not be exposed to external cracks in the walls.
Q. Will concealing the electric wires in slab or any other concrete structures weaken the concrete?
No, the concealed wiring will not weaken the concrete structure.