Figure 5-54.Conduit bodies and covers.
Figure 5-55 shows how a conduit body is put in conduit
between two outlets to keep the bends within NEC©
limits for a single run. As you can see, the run on the left
has bends that total 360 degrees, which is all the NEC©
permits. Thus a conduit body, as discussed in NEC©
Article 300, had to be installed so that the conduit could
be continued to the box on the right. After all conduit
has been installed, supported, and connected to the
boxes, you are ready to install the wire.
Conductor installation into conduits is the same for
all types of conduit. The most common type of wire
used is TW. This letter designation simply means that
the wire or conductor has thermoplastic, moisture-
resistant insulation. When you are determining the
length of wire needed to be pulled into the circuit,
simply add the following: (1) lengths of conduit, (2) the
size and number of boxes you must pull through, (3) the
length of wire needed at each box, and (4) the makeup
for the distribution panel.
For short conduit runs with only two wires, the
conductors can be pushed through the conduit from one
box to the next. When the conduit has several bends and
more than two conductors will be installed, a fish tape
has to be used to pull the wires through the conduit. The
fish tape normally has a hook on one end, which is
pushed through the conduit. The hook also makes it
easier to push the tape through. If the hook is broken off,
you can make a new one with a pair of pliers and a
propane torch. The torch is used to heat the end of the
tape to take out the temper. On a l/S-inch tape, heat
Figure 5-55.Conduit body installed.