Kistler-Morse KM L-Cell Bolt-On - Manual (Page 33)

Chapter 4. L-Cell Installation on Horizontal Beams
4-8
Mounting Location
Each junction box can be wired to a maximum of two L-Cell sets (four L-Cells
total):
•
One set of L-Cells on a beam — both L-Cells are wired to one junction box.
• Two sets of L-Cells on a beam — all four L-Cells are wired to one junction
box if the sets are sufficiently close to each other to allow the L-Cell cables
to reach the junction box.
See Figures 4-12 and 4-13. Locate the junction box on the instrumented beam or
on the supporting column or horizontal beam. Ensure you have sufficient cable
length and that a drip loop will be formed by the L-Cell cables when wired to
the junction box.
Junction Box Installation
Note
Junction box mounting hardware is not supplied by KM. KM
recommends #8-32 socket head cap screws and flat washers. The
instructions below reflect this recommendation.
1. Remove the junction box cover.
2. See Figure 4-14. Hold the junction box at the previously marked mounting
location. Mark the four outside mounting holes.
3. Drill and tap the mounting holes with a #29 drill bit and #8-32 tap.
4. Mount the junction box with #8-32 socket head cap screws and flat
washers. Tighten the screws until snug. Replace the junction box cover
and screws if not ready to begin wiring, to ensure no moisture enters the
junction box.
Mounting Junction Box
CAUTION
Do not install
junction boxes in
the rain. Moisture
in the junction box
will cause
corrosion and
system errors.
Figure 4-12. Junction Box Location —
Two L-Cells per Junction Box
Load Point
Possible Junction Box Locations
Load Point
Possible Junction
Box Location
Figure 4-13. Junction Box Location —
Four L-Cells per Junction Box
Figure 4-14. Junction
Box Mounting
Outside Mounting Holes for
Flat Surfaces (4 places)