I.E. Rules and General Rules for Wiring L.V. and M.V.Installations:

 

 

I.E. Rules and General Rules for Wiring L.V. and M.V.Installations:

The relevent I.E. Rules to be complied with and standard practices to be followed for wiring of single phase (240 Volt) and three phase (415 Volt) installation are given below:

1. The cable and apparatus used are to be of sufficient rating and to conformto elevent Indian Standard specifications. (Rule 29).

2 Electrical installations are to be carried out only by a licensed electrical contractor (Rule 45)

3. A suitable linked switch with fuses or a circuit breaker is to be placed at the point of commencement of the supply in a readily accessible place which can be easily operated (Rule 50)

4. Every individual circuit is to be protected against excess current by means of a suitable-fuse, switch or circuit breaker (Rule 50).

 5. No fuses or switches (other than a linked switch) are to be placed on the earthed neutral conductor (Rule 32).

 

6. All conductors of 3-phase, 415-V installation are to be enclosed in metal conduit or rigid PVC conduit All metal coverings are to be earthed (Rule 51).

7. All metal casing or covering of electric line or apparatus are to be earthed In case of 240-V installation isolated metal fittings may not be earthed. All 415-V motor and their controlling apparatus are to be earthed by two separate and distinct connection with earth (Rule 61).

8. All 3-phase 415-V installations and single phase 240-V installations of load 5 kW and above are to controlled by a LCCB (Rule 61A)

9. The light and fan sub-circuits are to be kept separate from the power sub-circuits.

10. All main switches are to be of metal clad enclosed type or of insulated enclosed type.

11. All distribution boards with fuse or M.C.Bs are also to be metal enclosed type or insulated enclosed type. Each DB. should be controlled by a controlling switch or M.C.B. Each D.B. should have at least one spare way.

12. All sockets are to be of 3-pin type and third pin of the socket to be

connected to earth. All sockets are to be controlled by individual switches

 13 Only 15-A, 3-pin type socket is used for power circuit. For domestic and and commercial installations it should have its own fuse besides the control switch.

14. The load in each light and fan sub-circuit is to be restricted to 800 watts, 10 points.

 15. The load in each power sub-circuit is to be restricted to 3000 watts. Not more than two socket outlets to be connected in a power sub-circuit.

16.The main switch and other switches are to be installed at a height of 1.5m from the floor.

17.For domestic installation lamps should normally be at height of 2.5 m and ceiling fans at a height of 2.75 m.

 

 18. The insulation resistance of the completed installation is to be measured with a 500-V meggar for one minute. The insulation resistance should be at least 1 meg-ohm (Rule 48)