E-12
10.3 SERVOPACK Main Circuit Wire Size
Cable Types
• Wire sizes are selected for three cables per bundle at 40
°
C (104
°
F) surrounding air
temperature with the rated current.
• Use cable with a minimum withstand voltage of 600 V for main circuits.
• If cables are bundled in PVC or metal ducts, consider the reduction ratio of the allow-
able current.
• Use heat-resistant cables under high surrounding air or panel temperatures where
normal vinyl cables will rapidly deteriorate.
• Use cables within the allowable moment of inertia.
• Do not use cables under continuous regenerative state.
The following table shows the wire size and allowable current for three cables. Use a cable
whose specifications meet or are less than the values in the table.
• 600-V Heat-resistant Vinyl Cables (HIV)
Note: The values in the table are only for reference.
Cable Types
Allowable Conductor
Temperature
°
C (
°
F)
Symbol
Name
PVC
Normal vinyl cable
−
IV
600-V vinyl cable
60 (140)
HIV
Temperature-resistant
vinyl cable
75 (167)
AWG Size
Nominal
Cross
Section
Diameter
mm
2
(in
2
)
Configuration
Number of
wires/mm
2
(in
2
)
Conductive
Resistance
Ω
/km
Allowable Current at Surrounding Air
Temperature A
30
°
C
(86
°
F)
40
°
C
(104
°
F)
50
°
C
(122
°
F)
20
0.5
(0.00078)
19/0.18
(0.00028)
39.5
6.6
5.6
4.5
−
0.75
(0.00116)
30/0.18
(0.00028)
26.0
8.8
7.0
5.5
18
0.9
(0.00140)
37/0.18
(0.00028)
24.4
9.0
7.7
6.0
16
1.25
(0.00193)
50/0.18
(0.00028)
15.6
12.0
11.0
8.5
14
2.0
(0.00310)
7/0.6
(0.00093)
9.53
23
20
16
12
3.5
(0.00543)
7/0.8
(0.00124)
5.41
33
29
24
10
5.5
(0.00853)
7/1.0
(0.00155)
3.47
43
38
31
8
8.0 (0.0124)
7/1.2
(0.00186)
2.41
55
49
40
6
14.0
(0.0217)
7/1.6
(0.00248)
1.35
79
70
57
4
22.0
(0.0341)
7/2.0
(0.00310)
0.85
91
81
66
