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FOR TT3000 SENSING CABLE:
1. Prepare the cable and perform resistance measurement to confirm
the cable is clean and dry.
• Locate and expose the cable end from the inside of the reel
(not the end to be pulled).
• Expose 1 to 2 inches (25 to 50 mm) of the two black wires by
prying them out of the cable.
• Strip 1/2 inch (12 mm) of the black material to expose the
copper wire. Note: The black material is conductive; it is not
insulation.
• Use an ohmmeter to measure the resistance between the
two black wires; attach the ohmmeter leads to the exposed
copper. For a clean, dry cable, the resistance should be greater
than 20 MΩ.
• If the resistance is less than 20 MΩ, check to see if there
is moisture or contamination on the cable. If the problem
causing a low-resistance reading cannot be located, the
sensing cable may be damaged. Contact RAYCHEM for help.
2. While TT3000 cable is being installed in double-containment pipe, it
must be monitored with an ohmmeter to alert the feeder if moisture
is encountered. Clip the ohmmeter to the two black wires and tape
it to the outside of the cable reel flange (see illustration).
3. Wrap a small amount of electrical tape tightly around cable end to
be pulled; this makes it easier to insert in the Kellems grip.
Note: Begin cable installation at the end of the pipe closest to the
TraceTek alarm and locating module.
2. Attach Kellems grip to sensing cable.
1. Make sure the end of the sensing cable has been properly
prepared (end of TT5000 sensing cable should be sealed
with heat-shrink tubing; end of TT3000 should be wrapped
tightly with electrical tape).
2. Insert the end of the cable as far as possible into the cage
end of the Kellems grip.
3. Tightly wrap electrical tape over 1 in (25 mm) of the Kellems
grip and 1 in (25 mm) of the exposed sensing cable to make
a smooth transition.
3. Attach pull rope to Kellems grip.
1. To ensure the end of the pull rope is compact and has no
loose strands, tightly wrap the tip with electrical tape.
2. Feed the end of the pull rope through one of the sections of
sweep conduit, curved end first (see illustration).
3. Open the braid 18 in (450 mm) from the end of the pull rope.
A pencil or screwdriver can be used.
4. Pass the rope end through the looped end of the Kellems
grip and insert 6 in (150 mm) through the braid opening and
into the hollow core of the rope. Tightly wrap tape over the
end of the rope and back 2 in (50 mm) toward the loop (see
illustration).
Secure the
ohmmeter
to the reel
flange.
Sensing
cable
2 in
(50 mm)
Tape over here.
Curved, flared and
deburred conduit
From pipe
Open rope braid to
access hollow core.
Compress rope lengthwise to "balloon"
section 18" (450 mm) from end.
Tape here
2 in (50 mm)
6 in (150 mm)
Insert end into hollow core.
To ohmmeter
TT3000 sensing cable
Electrical tape
Make sure end
has been prepared
To reel
18 in (450 mm)
Pass rope end
through looped end
of Kellems grip.
nVent.com | 3
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