Q. How do we start Repairs?
1.It is necessary to appoint a structural Consultant for repairs. He does the physical examination and testing of the structures is first done and weak spot /areas are identified.
2.Consultant prepares and estimates the cost by preparing bill of quantities of various items/area of repairs.
Q. What are the steps followed in Concrete / Masonry Repairs?
1. Defective ( Cracked ) portion of concrete or plaster has to be removed.
2. During repairs, columns, beams must be supported to reduce load on this members.
3. Remove all rust from steel bars.
4. Wash & clean the entire surface before taking up repairs.
5. If masonry is in bad condition it should be replaced.
6. The repaired surface must be scratched and roughened to give mechanical bond with subsequent finishing coats of mortar or plaster.
7. The repair surface should be cured for 7 days.
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.