Kevin2120
New member
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- Huntsville, AL
What size emt would i use for 2 1/0 and #6 ground to feed an x-ray machine? Thanks
Emt sizing for x-ray machine
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JoeStillman
Senior Member
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- West Chester, PA
Be careful how you determine the size of the cable. This could be medium voltage cable between two pieces of X-Ray equipment. I don't think you'll find dimensions of this in Chapter 9. You'll need to calculate the area of the cables based on the outside diameter (pi x d²/4).
If this is just ordinary 600V cable, though, I'm confident you'll find the cable dimensions in the tables.
Every X-Ray machine I've ever laid out comes with a set of drawings from the manufacturer with all this detailed and I'm surprised you're being called on to do this.
If this is just ordinary 600V cable, though, I'm confident you'll find the cable dimensions in the tables.
Every X-Ray machine I've ever laid out comes with a set of drawings from the manufacturer with all this detailed and I'm surprised you're being called on to do this.
petersonra
Senior Member
- Location
- Northern illinois
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- engineer
It would be somewhat unusual at a hospital to use an outside contractor without very tight supervision from their own in house people who would have detailed this kind of thing to them.
But maybe at some satellite facility or a doctor's office.
I don't know that they would even allow EMT either.
The OP said "feed" which would be indicative of a "feeder" and would be calculated using chapter 9 conduit and wire tables.
NEC recognized conductors are already shown in chapter 9.
True, and wiring (including raceways and conductors) that is part of the machine would be designed and shown on the manufacturers plans and legends.
Which makes it more apparent he is asking about the feeder to the unit.
Roger
In my experience radiology rough in is always installed by outside Electrical Contractors, granted the facility needs to be sure the EC's are experienced in healthcare installations.
Most hospitals do not have equipment for bending large conduit, pulling large feeders, core drilling floors, etc....
EMT and stamped steel boxes is the norm.
Roger
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petersonra
Senior Member
- Location
- Northern illinois
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- engineer
My experience with hospitals is limited to trying to stay away from them. But I did know a guy who was an electrician at a hospital. That's why I phrased what I said the way I did. They would not allow an outside contractor to decide how this work is to be done. They would tell them.
The hospital this guy worked at did not allow EMT to be used when running feeders. They could run branch circuits that way, but not feeders, if I understood what he was telling me.
I would say understood him correctly. One of the hospitals I did a lot of work in called for RMC for Critical and Life Safety feeders and IMC for Normal Power, this was a lot of fun for large raceways (2.5" to 4") above drop ceilings. Most allowed EMT though.
The way I looked at it was if something so catastrophic happened that would substantially damage large EMT above a drop ceiling odds would be that there would be structural damge as well and the electrical would most likely not be the biggest concern.
We did price accordingly though so we just did what was called for.
Later down the road they wanted some VE suggestions for one of their projects so we offered a big number to use EMT instead of the two conduit systems and they jumped on it, I don't know what their standard is now.
Roger
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