Chapter 4 Wiring Systems
95
Manual pipe threader
Powered threading machine
Figure 4-27. Putting threads on RMC requires some
specialized tools. (Ridge Tool Co.)
Threading RMC
1. Clamp the conduit into a pipe vise. See
Figure 4-27.
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.
5. Mount a threading die inside the head
of a hand threader. (See 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 start
cutting 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.
Rigid PVC Conduit
Rigid polyvinyl chloride conduit (PVC) is
constructed of polyvinyl chloride (PVC), a tough,
nonconductive plastic. PVC weighs much less
than metal conduit and is designed to be used
everywhere other types of conduit are used. There
are many different fi ttings available to connect
Rigid Polyvinyl Chloride Conduit: Type PVC — Article 352
Locations Allowed
Dry
Wet
Corrosive
Sizes
1/2″
through
6″
Maximum Mounting Distance
3′
See
Table 352.30 (B)
the PVC to metallic and nonmetallic boxes and
conduit. See Figure 4-28. PVC is only restricted in
certain hazardous locations and where it could be
physically damaged. Check with your authority
having jurisdiction (AHJ) to see if local code
permits its use. Do not use to support fi xtures.
rigid polyvinyl chloride conduit (PVC): A conduit that
is constructed of polyvinyl chloride (PVC), a tough,
nonconductive plastic.