3. Cabling
3-6
TI 33Q01J10-01E
[Maximum power cable length calculation conditions]
Use the following formula to calculate the maximum power cable length:
(a) 100 V AC and 220 V AC supply voltages
F030206.ai
L (m)=
Voltage drop across wiring
Conductor resistance (ohm/km)×(Number of cores)×Equipment current consumption
× 1000
(b) 24 V DC supply voltage
F030207.ai
L (m)=
Voltage drop across wiring
Conductor resistance (ohm/km)×(Number of cores)×Equipment current consumption
× 1000
Note: In the formulas above, the voltage drop across wiring is assumed to be 2 V for AC power supplies and 1.2 V for DC power
supplies; the number of cores is two; and the conductor resistance is as specified in the table below.
Table Wire Nominal Cross Sectional Areas and Resistances
Wire nominal cross sectional area 5.5 mm
2
8 mm
2
14 mm
2
22 mm
2
Wire conductor resistance 3.37 ohm/km 2.39 ohm/km 1.36 ohm/km 0.82 ohm/km
Nov. 20, 2003-00
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