x-ray again

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tblakey

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It seems that I cannot find anyone to answer my question on how to calculate the load on a service for an x-ray machine. If anyone has any insight it would be greatly apprieciated.
 
How quick we forget! I worked in Picker X-ray D&D for awhile (1998 to 2000). Did all kinds of power testing. But, I can't remember anything that will help.
 
full load for 2 sec

full load for 2 sec

If i remember right.. the Xray machine will spec out a supply fused disconnect panel. My last one was 70amps 240 2-pole for your average DR. Office. _______The machine only carries FULL LOAD for a few seconds_____to take the picture, it hen reverts back to control voltage.
 
Yes, the manufactures specs tell me to use a mininimum 100a disc. and the maximum momentary current draw is 152a, the code says I can use 50% of max momentary current draw to size my branch circuit conductors, but, I called the manufacturer and they said it would only draw the 152a for .5 of a second. So how do I size the electrical service? Do I use 50% of the max mom. current draw(75a) and add that to all three phases of my service?
 
I would use the 50% factor for your load calculations. 517.73 lets you do that. So, yes that would be 76 amps on each phase for a 3 phase machine.

Then I would use the 100 A breaker that the manufacturer wants for the branch circuit, along with branch circuit conductors sized for 100A.

Steve
 
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