MRI equipment

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517.13 Grounding of Receptacles and Fixed Electrical Equipment in Patient Care Areas.

(A) Wiring Methods. All branch circuits serving patient care areas shall be provided with an effective ground-fault current path by installation in a metal raceway system, or a cable having a metallic armor or sheath assembly. The metal raceway system, or metallic cable armor, or sheath assembly shall itself qualify as an equipment grounding conductor in accordance with 250.118.

I assume an MRI would be in a patient care area

Are you talking about the feeder to the panel or branch circuit to the MRI

Edit , would 517.30 Essential Electrical Systems for Hospitals. be applicable to this installation
 
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david said:
517.13 Grounding of Receptacles and Fixed Electrical Equipment in Patient Care Areas.

(A) Wiring Methods. All branch circuits serving patient care areas shall be provided with an effective ground-fault current path by installation in a metal raceway system, or a cable having a metallic armor or sheath assembly. The metal raceway system, or metallic cable armor, or sheath assembly shall itself qualify as an equipment grounding conductor in accordance with 250.118.

I assume an MRI would be in a patient care area

Are you talking about the feeder to the panel or branch circuit to the MRI

Edit , would 517.30 Essential Electrical Systems for Hospitals. be applicable to this installation
Click to expand...

I am referring to the feed to the Panel. I have read the code book on Patient care areas. Which this definitely is. All my branch circuitry in the MRI will be in EMT or non ferrous metals. I just dont see that the Panel is required to be in a metal raceway.
 
Journeyman63 said:
I am referring to the feed to the Panel. I have read the code book on Patient care areas. Which this definitely is. All my branch circuitry in the MRI will be in EMT or non ferrous metals. I just dont see that the Panel is required to be in a metal raceway.
Click to expand...
You are correct.

Roger
 
Journeyman63 said:
I am referring to the feed to the Panel. I have read the code book on Patient care areas. Which this definitely is. All my branch circuitry in the MRI will be in EMT or non ferrous metals. I just dont see that the Panel is required to be in a metal raceway.
Click to expand...

keep in mind if the panel in question is on the critical branch it can no be schedule 40 PVC unless uncased in concrete
 
david said:
keep in mind if the panel in question is on the critical branch it can no be schedule 40 PVC unless uncased in concrete
Click to expand...
That is a good point David although I think you meant "encased" :)



Roger
 
I read the OP as if the conduit was crossing over UNDER the MRI???? If going under an MRI with conduit, the NEC has naught to do with the real potential problems. Not a good thing to even consider in most cases.

You need to have the exact dimensions of the conduit routing, the currents in the conduit, and the time domain plot of the MRI magnetic field of the machine.

Overlay the MRI field on the field produced by the current in the wires - see if there is enough force on the wires to cause them to vibrate and abrade thru the PVC over time.
 
junkhound said:
I read the OP as if the conduit was crossing over UNDER the MRI???? If going under an MRI with conduit, the NEC has naught to do with the real potential problems. Not a good thing to even consider in most cases.

You need to have the exact dimensions of the conduit routing, the currents in the conduit, and the time domain plot of the MRI magnetic field of the machine.

Overlay the MRI field on the field produced by the current in the wires - see if there is enough force on the wires to cause them to vibrate and abrade thru the PVC over time.
Click to expand...

i would think if its under the MRI then anything metal should be carefully considered, not just the conduit. wires, cable type if a cable was used, etc etc.
 
Thanks, since it pvc conduit, assumed everyone would take the meaning of the 'currents in the conduit' as the currents in the wires. Good education in being more precise with language.
 
junkhound said:
Thanks, since it pvc conduit, assumed everyone would take the meaning of the 'currents in the conduit' as the currents in the wires. Good education in being more precise with language.
Click to expand...

Thanks everyone. The pvc conduits are not routed near the MRI magnetic field. Not even near it. Its good to know I was weighing everything out correctly and looking in the right place for information.
 
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