Kistler-Morse KM L-Cell Bolt-On User Manual
Page 54
Chapter 5. L-Cell Installation on Skirt-Supported Vessels
5-17
Wiring Junction Boxes Together and to
Signal Processor
There are two versions of the junction box enclosure. Both versions
have four small holes for wiring L-Cells to the junction box, as described
above. In addition, the junction box has one or two large holes for
wiring the junction box to the other junction boxes and to the signal
processor:
•
One large hole for conduited installation — The large hole accom-
modates a
3
/
4
” conduit fitting.
•
Two large holes for non-conduited installation — The two large
holes are equipped with PG13.5 cable fittings.
KM requires the use of cable trays for non-conduited installations.
Notes
1. The procedure below assumes the conduit/cable tray has
been installed.
2. Seal all conduit fittings against water entry. Install drain holes
at conduit/cable tray lowest elevation(s) to allow
condensation to drain.
3. Use Belden™ 3-conductor shielded interconnect cable or
equivalent to wire junction boxes together and to the signal
processor. For lengths up to 1,000’ (305m) use 18-gage
Belden 8791 cable. For lengths from 1,000’ to 2,000’ (305m to
610m) use 16-gage Belden 8618 cable.
4. When wiring cable to junction box terminals, strip 3” (76mm)
of cable sheathing to expose the three conductor wires and
shield wire inside. Strip
1
/
4
” (6mm) of insulation from the end
of each of the conductor wires.
5. All wiring routed between junction boxes and signal
processor must be continuous (no splices).
1.
Remove the junction box cover.
• Conduited installation — Install a conduit fitting in the large
hole in the bottom of the junction box.
• Non-conduited installation — Spread a generous bead of
sealant around the sides of the PG13.5 cable fittings. Install the
fittings in the two large holes in the bottom of the junction box.
2.
See Figure 5-40 (conduited installation) or Figure 5-41 (non-
conduited installation). Route the 3-conductor cable through the
fitting into the junction box farthest from the signal processor.
Connect wires from the cable to the TB2 terminal in the junction
box: black wire to B, white wire to W, and red wire to R. Connect the
cable shield wire to the Shield terminal between TB1 and TB2.
3.
Route the cable through conduit/cable tray to the next junction box.
Estimate the required length of cable to the terminal strip, allowing a
little extra for strain relief. Cut the excess cable. Connect wires from
the cable to the TB1 terminal in the junction box: black wire to B,
white wire to W, and red wire to R. Connect the cable shield wire to
the Shield terminal between TB1 and TB2.
Figure 5-38. Inserting Shielded Interconnect
Cable through PG13.5 Fitting and Cap
PG13.5 Fitting
& Cap
Large Hole (typical)
Sealant
Shielded Cable
12
12
12
12
Note: After cable is
connected to terminals,
tighten cap until cable
glands in fitting seal
around cable.