Estimation of Electrical Wiring True & False

Estimation of Electrical Wiring True and False Points : estimation of electrical wiring true and false estimation of electrical wiring objective True & False

1. Anyhow material handling charges should not be more than 5% (max.) of material cost. (T)
2. Overhead charges will generally be assumed as 10% to 25% of the total cost. (F)
3. In large installations, tool charges aren’t be included. (F)
4. Tool charges are usually 3 to 5% of the total cost. (T)
5. Strictly follow I.E. Rules of 1956. ISI specifications, National Electric Code and the requirements of State Electricity Board Inspectors. (T)
6. Wiring of All multi-storied buildings above 15.0 M Height must be inspected by Electrical Inspector and he/she has to approve (Rule 60 A) . (F)
7. Any wiring system has to last for 15 years. (F)
8. In wiring system high quality materials are to be used. (T)
9. High quality workmanship must be executed through qualified contractors so materials cost and labour charges will be high. (T)
10. For loads above 5 KW, single phase supply must be arranged. (F)
11. The wiring should be done very close to the ceiling. (T)
12. For final sub-circuits, use 1 sq. mm of copper or 1.5 sq. mm. Aluminum for earth conductor. (T)
13. The bottom of ceiling fan should have a mm. clearance of 3 m. (F)
14. Provide 3 pin plug points at switch boards, with switch controls and solidly earth and third pin. (T)
15. The consumer should provide ONE earth electrode for single phase as well as three supplies. (F)
16. Earth pipe dimension should be 40 mm dia and 2.5 M length. (T)
17. If more than one electrode is provide, all earth electrodes must be linked, for combined low resistance. (T)
18. If more than one electrode is provided, water them periodically. (T)
19. Use a minimum of 10 SWG TC (Tinned — Copper) for earth leads. (F)
20. All non-current carrying metallic parts must be provided with 2 separate and distinct earth wires. (T)