152 Section 3 Installation Copyright Goodheart-Willcox Co., Inc. Goodheart-Willcox Publisher Figure 10-14. Rigid metal conduit is threaded so that it can be attached to fittings and couplings. RMC nipples Conduit bodies Bushing Locknuts Preformed bends Coupling PROCEDURE Threading RMC with a Hand Threader 1. Clamp the conduit into a pipe vise. See Figure 10-15. 2. Place an appropriately sized pipe reamer inside the end of the conduit. 3. Rotate the reamer until all the burrs are removed from the inside of the conduit. 4. Remove any burrs from the outside of the conduit with a fi le. (Continued) 5. Mount a threading die inside the head of a hand threader (manual pipe threader), following the manufacturer’s instructions. 6. Add cutting oil to the end of the conduit to ease the cutting and prevent tool wear. 7. Place the threading die squarely on the end of the conduit. 8. Rotate the hand threader while pressing its head toward the conduit. 9. The die will engage the conduit and begin cutting the threads. 10. Stop pushing the head and continue rotating the hand threader. Add cutting oil to the conduit after every few rotations. 11. When the end of the conduit is even with the back of the threader die, stop the rotations. 12. Reverse the direction of the hand threader to remove it from the conduit. 13. Clean off the threads with a rag and remove the conduit from the vise. CODE ALERT RMC Bushings Section 344.46 requires that bushings be used where a rigid metal conduit enters a box, fit- ting, or other enclosure to protect the wire from abrasion unless the design of the box, fitting, or enclosure is designed to provide such protection.