UFC 3-535-01
17 November 2005
L = T x KW
Where:L = Length of cable pulled (in feet)
T = Total tension (in pounds)
K = Coefficient of friction (0.3 for single cables, 0.4 for multiple cables)
W = Weight of all cables being pulled (in pounds/foot)
12-4.6
A dynamometer should be used to monitor the cable tension during
pulling. Alternatively, a contractor may adapt a rope harness properly sized to limit pull
tension. Types and sizes for ropes used in this manner may be found in FAA-C-1391
Table 1. Manufacturer's data on allowable cable pulling tension should always be used.
Any combination of a group of cables to be pulled into a duct must not exceed the sum
of individual allowable tension of each cable plus 15 percent. Typical examples of the
allowable maximum tension for various types of cable are shown in Table 12-4.
Table 12-4. Maximum Allowable Non-Armored Cable Pulling Tension,
Using Dynamometer
Tension
Cable
Kg (Lb.)
2 1/C #8 solid
125 (275)
3 1/C #8 solid
167 (367)
4 1/C #8 solid
250 (550)
2 1/C #6 stranded
191 (420)
3 1/C #6 stranded
286 (630)
4 1/C #6 stranded
382 (840)
1 2/C #8 stranded
139 (305)
1 3/C #8 stranded
180 (395)
1 4/C #8 stranded
266 (585)
1 2/C #6 stranded
207 (455)
1 3/C #6 stranded
311 (685)
1 4/C #6 stranded
400 (880)
1 6/C #12 stranded
143 (315)
1 12/C #12 stranded
286 (630)
1 12 pair #19 solid
105 (230)
1 25 pair #19 solid
246 (541)
1 50 pair #19 solid
482 (1061)
1 100 pair #19 solid
909 (2000)
178
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