YOKOGAWA ProSafe-RS - Page 113

3. Cabling
3-6
TI 32P01J10-01EN
[Maximum power cable length calculation]
Use the following formula to calculate the maximum power cable length:
(a) 100 V AC and 220 V AC models
F030202.ai
L (m)=
Voltage drop across wiring
Conductor resistance (ohm/km) x (Number of cores) x Equipment current consumption
x 1000
(b) 24 V DC model
F030203.ai
L (m)=
Voltage drop across wiring
Conductor resistance (ohm/km) x (Number of cores) x Equipment current consumption
x 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 specied 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. 27, 2015-00