MEGA MC Cable Installation & Application Guide - Southwire

page 27
Maximum tension on conductors—The conductors of the cable are generally the only members
that can bear the pulling forces without damage. Do not use metallic shielding wires,
tapes, braids or armor not designed for the purpose in pulling tension calculations. It is important
to remember that when pulling MC feeder cable, the limiting factor is typically the sidewall
bearing pressure.
Definitions for the following equations:
Tc = tension on each conductor, in pounds
S = allowable stress from table, in pounds/cmil
A = area of each conductor, in cmil
N = number of conductors
T cable
Tdevice Tm = maximum allowable tension in the cable in pounds
= maximum allowable tension on device in pounds
= maximum allowable tension is the lesser of T or T in pounds
device cable
Maximum allowable Conductor stress (s)
Material temper ib/cmil
Copper soft 0.008
aluminum aa-8176 0.006
Conductor area (a)
size Cross-sectional area size Cross-sectional area
AWG cmil kcmil cmil
single conductors
T c = S • A pounds
T
Tcable = T c
14 4110 250 250,000
12 6530 300 300,000
10 10380 350 350,000
8 16,510 400 400,000
7 20,820 450 450,000
6 26,240 500 500,000
5 33,090 550 550,000
4 41,740 600 600,000
3 52,620 650 650,000
2 66,360 700 700,000
1 83,690 750 750,000
1/0 105,600 800 800,000
2/0 133,100 900 900,000
3/0 167,800 1000 1,000,000
4/0 211,600
Southwire MC inStallation Guide section 4. AnneXes