Specification
MC CABLES
30
800-757-6996
Fire Alarm® Control Cable Performance Charts
Conductor Size
AWG
XL,
Reactance
1
Rac,
Resistance, 75°C
2
Z,
Eective
3
Impedance
Electrical Properties (ohms to neutral per 1000 feet)
18 0.047 7.77 6.24
16 0.043 4.89 3.93
14 0.042 3.07 2.48
12 0.04 1.93 1.57
1
In Steel Armor
2
To correct for 90°C, multiply by 1.048
3
Effective Impedance is defined as R cos (Theta) + X sin (Theta) where Theta is the power factor angle of the circuit. Effective impedance values shown in the table above are valid at 80% power factor.
Conductor Size
AWG
Twisted
Pair
1
Twisted Shielded
Pair
2
Mutual Capacitance (pico farads per foot)
18 30 47.3
16 33.5 54.8
14 36.3 60.7
12 38.8 66.4
1
In Steel Armor
2
To correct for 90°C, multiply by 1.048
3
Effective Impedance is defined as R cos (Theta) + X sin (Theta) where Theta is the power factor angle of the circuit. Effective impedance values shown in the table above are valid at 80% power factor.
Inductance (L) to neutral, per 1000 feet is typically 0.0002mH for sizes 18 AWG through 250 kcmil
= 0.1404 Log10(GMD/GMR) x 10-3 Henrys to neutral per 1000 feet]
Size
Total Number of Conductors
Including Ground
Conductor Diameter Length of Lay Twists per Foot
Twists per Foot
18 2 0.08 2.4 5
18 3 0.08 2.8 4.3
18 4 0.08 3.2 3.8
18 5 0.08 3.3 3.7
16 2 0.09 2.7 4.4
16 3 0.09 3.2 3.8
16 4 0.09 3.6 3.3
16 5 0.09 3.7 3.3
14 2 0.105 3.15 3.8
14 3 0.105 3.7 3.3
14 4 0.105 4.2 2.9
14 5 0.105 4.3 2.8
12 2 0.125 3.75 3.2
12 3 0.125 4.4 2.7
12 4 0.125 5 2.4
12 5 0.125 5.1 2.4
Copper Ground
Nylon Thermoplastic
TFN or THHN Insulation
Interlocked Galvanized Steel Strip
(Color-Coded Red)
Copper
Conductors
Assembly Tape
AFC Cable Catalog
30
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