MRI Power Quality

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Shujinko

Shujinko

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I am part of the electrical design of a mock MRI room at a medical school. The client is installing a real MRI machine at 480V, 3ph, 110kVA load. My plan is to connect the machine directly to the building Main Switchboard, distribution section. This MRI unit will be fed via a 160 KVA UPS (Double Conversion Type). I noticed that the Main Switchboard I planned to connect the machine to, also has (2)-5HP motors and (2) - 1.5HP motors connected to it. Would having the MRI connected to the same Main Switchboard as these motors affect it's power quality and MRI functionality?

My other option is to ask for a separate new electrical service main just for the MRI machine. However I wanted to avoid this because it is more costly.
 
I think it is fine to install the feeder from the building Main Switchboard.

You should be sure there is a surge protection device at the building Main Switchboard, to protect against internally (and externally) generated surges.
 
Won't the double conversion UPS take care of any transients on the line to the MRI, and provide clean power? I agree that surge protection at the main switchboard is warranted to catch any nasties that might damage the UPS.



SceneryDriver
 
Yes, the switchboard has an SPD device and the UPS is a double conversion type so I think it's covered. I was just making sure because the MRI vendor has alot of CYA notes on their drawings about connecting their MRI equipment to panels with motor loads on them. What type of electrical load would have a noticeable effect on an MRI machine's power quality, I imagine a large motor with across the line starting, etc? What would be the exact effect on the MRI machine?
 
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