Q. What are requirement of foundations for installing rotating electrical machines as per IS 900-1992 ?
A solid foundation of concrete is provided for the installing of rotating machine. To avoid misalignment of plate proper mounting of the machines, the motor or prime mover and the driven machines are mounted on the common foundation. Usually the manufacturer put both the machines on common steel base. The size of the foundation is decided from the drawing supplied by the manufacturer. The foundation is designed taking into consideration the dynamic as well as static load.
The foundation consists of following :
- Foundation made of cement, concrete material.
- The bed plate.
- Foundation bolts.
The concrete foundation should be about 15 cms larger in both length and breadth. The depth foundation is decided taking into consideration the work place, panel height etc. The depth of foundation is dependent on the H.P.rating.
|
Sr. No. |
Rating |
Depth |
|
1 |
75 to 100 H.P. |
35 cm to 60 cms |
|
2 |
50 to 75 H.P. |
25 cm to 30 cms |
|
3 |
20 to 50 H.P. |
20 cm to 25 cms |
|
4 |
10 to 25 H.P. |
15 cm to 20 cms |