In a major powerhouse. No Break Set is installed to ensure an unInterupted supply of power to vital equlpmoDt and systoms so that in tbe evont of failure of the normal power supply there Is no break in tho various operatioD’. The runctlon of such a set is oDly for tbe specific period that elapses between tho failure of normal power supply and the takins over of the supply by the . storaso battery system. Tho function of this ‘No-Break Set’ Is therefore vital . and it I. expected that such a set would remain In top condition all the time partionlarly durin. a seismic event since power I. likeiy to ,0 off in such an eventuality. Tblspapor presents tho result. of seismic analysis carried out for a typlea! no break set proposed to be installed in an activo seismic resion.