Vibration of MCC

[ptonsparky]

Last summer I had to relocate a motor feeder from one MCC to another. The stabs from the bucket had failed and ruined the vertical buss bar at that location.. Now that the system is shut down for winter we are checking the rest of the MCC. Of the 14 buckets in two columns six, had damage to the vertical buss. None of these are large loads. Age has some part in the failures I am sure. How much would the location next to vibrating equipment and a very busy railroad add to it? Anybody ever put an MCC on isolators?

 

[weressl]

Last summer I had to relocate a motor feeder from one MCC to another. The stabs from the bucket had failed and ruined the vertical buss bar at that location.. Now that the system is shut down for winter we are checking the rest of the MCC. Of the 14 buckets in two columns six, had damage to the vertical buss. None of these are large loads. Age has some part in the failures I am sure. How much would the location next to vibrating equipment and a very busy railroad add to it? Anybody ever put an MCC on isolators?

Do you have probelm with other equipment due to vibration?

Of course anything is possible, but once you inserted the 'bucket' into the 'cubicle' it is held in place mechanically. During the insertion the bus stabs are self aligning. A manufacturer would be able to tell you what is the maximum 'g' and frequency the assembled MCC can withstand. Some MCC's are rated fro seizmic duty and the only difference between those and regular MCC's is the anchoring requirements AFAIK.

Your best bet would be to installt a floating frame underneath the MCC and the isolation would be between the frame and the floor. Of coruse you should not use rigid contui, but cable tray to connect the power and control.