3.1 Main Circuit Wiring
3-5
3.1.2 Main Circuit Wire
This section describes the main circuit wires for SERVOPACKs and converters.
(1) Wire Types
Use the following type of wire for main circuit.
The following table shows the wire sizes and allowable currents for three wires.
Use wires with specifications equal to or less than those shown in the table.
Note: These are reference values for 600-V-grade, heat-resistant, PVC-insulated wire.
• The specified wire sizes are for use when the three lead cables are bundled and when
the rated electric current is applied with a surrounding air temperature of 40°C.
• Use a wire with a minimum withstand voltage of 600 V for the main circuit.
• If cables are bundled in PVC or metal ducts, take into account the reduction of the
allowable current.
• Use a heat-resistant wire under high surrounding air or panel temperatures, where
polyvinyl chloride insulated wires will rapidly deteriorate.
Cable Type
Allowable Conductor Temperature
(°C)
Symbol Name
IV 600 V polyvinyl chloride insulated wire 60
HIV 600 V grade heat-resistant polyvinyl chloride insulated wire 75
Nominal Cross
Section Diameter
(mm
2
)
AWG Size
Configuration
(Number of Wires/
mm)
Conductive
Resistance (Ω/
km)
Allowable Current at Surrounding Air
Temperature (A)
30°C 40°C 50°C
0.5 (20) 19/0.18 39.5 6.6 5.6 4.5
0.75 (19) 30/0.18 26 8.8 7 5.5
0.9 (18) 37/0.18 24.4 9 7.7 6
1.25 (16) 50/0.18 15.6 12 11 8.5
2 (14) 7/0.6 9.53 23 20 16
3.5 (12) 7/0.8 5.41 33 29 24
5.5 (10) 7/1.0 3.47 43 38 31
8 (8) 7/1.2 2.41 55 49 40
14 (6) 7/1.6 1.35 79 70 57
22 (4) 7/2.0 0.85 91 81 66
38 (1) 7/2.6 0.49 124 110 93
60 (2/0) 19/2.0 0.30 170 150 127
100 (4/0) 19/2.6 0.18 240 212 179
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