CommScope Trunk & Distribution Cable - Manual (Page 16)

Pulling Tension
Pulling tension for CommScope cables are shown in this chart. JCAM cables should be pulled by the messenger,
where the maximum pulling tension is limited by its minimum breaking strength. Cables are available with a .109
in (3mm) messenger rated at 1800 lbs (818 kgf), .188 in (5 mm) messenger rated at 3900 lbs (1769 kgf) or
.250 in (6 mm) messenger rated at 6650 lbs (3022 kgf).
NEVER EXCEED THE MAXIMUM PULLING TENSION.
Excessive forces applied to the cable will cause the cable to permanently
elongate. Good construction techniques and proper tension monitoring
equipment are essential. The highly flexible nature of QR cable makes it
very difficult to exceed the maximum pulling tension.
During cable placement, attention should be given to the number and
placement of cable blocks. The amount of sag between the blocks and
the amount of bending at the block affects the pulling tension.
Tail loading is the tension in the cable caused by the mass of the cable
on the reel and reel brakes. Tail loading is controlled by two methods.
It can be minimized by using minimal braking during the pay-off of the
cable from the reel - at times, no braking is preferred. Tail loading can
also be minimized by rotating the reel in the direction of pay-off.
Break-away swivels should be placed on each cable to ensure that the
maximum allowable tension for that specific cable type is not exceeded. The swivel is placed between the cable
puller and pulling grip. A break-away swivel is required for each cable.
Dynamometers are used to measure the dynamic tension in the cable. These devices
allow continuous review of the tension and accordingly a realization can be made
of any sudden increase in pulling tension. Sudden increases in pulling tension can
be caused by many factors such as a cable falling from a block or a cable binding
against pole-line hardware.
QR’s flexible
construction
means less
pulling effort
is required
Cable Max. Pulling Tension
lbs / kgf
QR 320 120 (54.5)
QR 540 220 (100)
QR 715 340 (154)
QR 860 450 (204)
P3 500 300 (136)
P3 625 475 (216)
P3 750 675 (306)
P3 875 875 (397)
MO500 270 (123)
MO650 360 (164)
MO750 500 (227)
3.2 Aerial Installation
Pulling Tension