I feel we should point out the NEC rule here.

Quote
352.24 Bends — How Made.
Bends shall be made so that the conduit will not be damaged and the internal diameter of the conduit will not be effectively reduced. Field bends shall be made only with bending equipment identified for the purpose. The radius of the curve to the centerline of such bends shall not be less than shown in Table 344.24, column “Other Bends.”

At least we should be aware of the code before we ignore it. [Linked Image]

I admit I have field bent RNC with equipment that was not 'identified for the purpose'.

Bob Badger
Construction & Maintenance Electrician
Massachusetts