Kistler-Morse KM L-Cell Bolt-On - Manual (Page 22)

Chapter 3. L-Cell Installation on Vertical Legs
3-8
Wiring L-Cells to Junction Boxes
CAUTION
Only use Sikaflex 1A
polyurethane sealant or
Dow Corning RTV 739 or
RTV 738. Other sealants
may contain acetic acid,
which is harmful to
sensors and electronics.
Figure 3-16. Inserting L-
Cell Cable through
Watertight Fitting and
Cap
L-Cell Cable
Watertight Fitting
and Cap
Small Hole
1
1
1
1
1
1234567
Plastic
Washer
Sealant
Note
1. The four small holes in the bottom of the junction box are for
wiring the L-Cells to the junction box.
1. Remove the junction box cover.
2. See Figure 3-16. Place a plastic washer on a watertight fitting. Thread
the L-Cell cable through a cap and watertight fitting. Leave an adequate
length of cable between the L-Cell and fitting to provide a drip loop
(see Figure 3-15).
3. Spread a generous bead of sealant around the sides of the watertight
fitting.
4. In the bottom of the junction box, locate one of the four small holes
closest to the terminal you will use for that L-Cell. Screw the watertight
fitting into the hole.
Note
TB3 terminal block has 12 terminals to accommodate up to four L-
Cells (A, B, C, and D). Locate the terminal labeled for the L-Cell you
are wiring.
5. Estimate the required length of cable to the terminal strip, allowing a
little extra for strain relief. Cut the excess cable.
6. Strip back 3” (76mm) of the cable sheathing to expose the three wires
inside. Strip back
1 /
4
” (6mm) of insulation from the end of each of the
wires.
7. Fig 3-18. Connect the wires from the L-Cell to the selected TB3
terminals: black wire to B terminal, white wire to W terminal, and red
wire to R terminal.
8. Perform Steps 2 through 7 for each L-Cell you wire to this junction box
(up to four).
9. Spread a generous bead of sealant (Sikaflex 1A polyurethane sealant or
Dow Corning RTV 739 or RTV 738) around the sides of the plug for
each hole not being used. Screw a plug into each hole.
10. Replace the junction box cover and screws if not ready to begin wiring
the junction boxes together, to ensure no moisture enters the junction
box.