Page 104 - MESCInstrumentationCatalogue

TECHNICAL INFORMATION

ELECTRICAL PARAMETERS FOR PLTC CABLES
SPECIFICATION UL13

22 20 18 16
TEST PAR AMETERS
AWG AWG AWG AWG
Conductor Resistance at 20°C (Ω/Km) Max.
Uncoated copper 57.6 35.8 22.8 14.2
Coated copper 59.7 37.2 23.6 14.9
Insulation Resistance at 20°C (MΩ-Km) Min.(XLPE) 1000
Spark Test Voltage (Volts) r.m.s. 1750
Dielectric withstand Test (Volts DC for 2 Seconds) 2500

DESIGN PARAMETERS FOR BALANCED PAIRS

Capacitance (C)

Unshielded Shielded Overall Shielded &
Twisted Pair Twisted Pair Cabled
7.218 . 12.14 . 9.515 .
= = =
1.3 (D) 1.2 (D) 1.5 (D)
Log Log Log
f (d) f (d) f (d)

Impedance Zo (ohms)

Unshielded Shielded Overall Shielded &
Twisted Pair Twisted Pair Cabled

310 276 1.2(D) 347 1.5(D)
= = Log = Log
C
f (d) f (d)

where C = Mutual capacitance in pF/m.
= Dielectric constant of insulation Material (Refer Table 1)
f = Stranding factor (Refer Table 2)
Vp = Velocity of propagation (Percentage of Velocity of Light)
D = Diameter over insulation in mm.
d = Diameter over conductor in mm.

TABLE 1 TABLE 2

Insulation Dielectric Vp(%) Number of Stranding
Material Constant Strands Factor (f )
PVC 5.0 45 1 1.000
PVC(Semi-Rigid) 4.6 47 7 0.939
Polyethylene 2.26 66 19 0.970
Cellular Polyethylene 1.56 82 37 0.980
Polyproplyene 2.2 67

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