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Cable and Fuse Guidelines
North America cable and fuse sizes—208 Vac to 240 Vac ratings
208V input
current
(VT/I
)
Frame size
L
FR1
4.4
6.1
7.2
10.2
11.6
FR2
16.3
23.2
29
FR3
44.2
56
FR4
64.6
78
94.3
FR5
129
157
189
FR6
242.8
290.3
Notes:
-
Line and motor cable size is selected according to UL 508C Table40.3 for copper
conductor rated 75 °C. Use only with copper wire rated 75 °C here. Size requirements for
other different wire types are defined in the National Electrical Code®, ANSI/NFPA® 70.
-
Earthing conductor size is determined by the maximum overcurrent device rating used
ahead of the drive according to UL 508C Table 6.4.
-
If power cubes or bypass are used, a UL listed Class RK5, J, T or equivalent fuse is
recommended.
NEC motor amp
NEC motor
rating
amp rating
at 230 V
at 208 V
4.2
4.6
6
6.6
6.8
7.5
9.6
10.6
—
—
15.2
16.7
22
24.2
28
30.8
42
46.2
54
59.4
68
74.8
80
88
104
114
130
143
154
169
192
211
248
273
312
343
®
N E C
NEC
w
wire size (AWG)
Current
Recommend
(VT/I
)
fuse
Line and
L
rating
at 40 °C
@
motor
4.8
10
14
6.6
10
14
7.8
10
14
11
15
14
12.5
15
12
17.5
20
10
25
30
8
31
35
8
48
60
6
61
80
4
75
100
3
88
110
2
114
125
1/0
143
175
3/0
170
200
4/0
211
250
300
261
400
2*2/0
312
400
2*4/0
Terminal connection size (AWG)
Line and
Ground
motor
14
24–10
14
24–10
14
24–10
14
24–10
12
24–10
10
20–6
10
20–6
10
20–6
6
6–2
6
6–2
4
6–1/0
4
6–1/0
3
6–1/0
3
1/0–350 kcmil
3
1/0–350 kcmil
3
1/0–350 kcmil
3
2*(1/0–300 kcmil)
3
2*(1/0–300 kcmil)
Ground
18–10
18–10
18–10
18–10
18–10
12–6
12–6
12–6
14–4
14–4
10–1/0
10–1/0
10–1/0
8–250 kcmil
8–250 kcmil
8–250 kcmil
3–300 kcmil
3–300 kcmil
22
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