Table D. - Cable d-c test voltage guide (continued)
Part 2
Varnished Cloth Insulated Cable
NEMA WC 4-1976, IPCEA Std. S-65-375
d-c/a-c ratio =
2
Conductor
size
(AWG or
kcmil)
Conductor
insulation
thickness
mils mm
Type of cable
Single conductor, shielded multiple
conductor and non-belted**,
nonshielded multiple conductor
Maximum conductor to sheath or
groung d-c test values in kV*
Grounded and ungrounded neutral service
6-5
4-2
4-2
1-4/0
213-500
501+
6-5
4-2
4-2
1-4/0
213-500
501+
6-5
4-2
4-2
1-4/0
213-500
501+
4-2
1-4/0
213-500
501+
2
1-4/0
213-500
501+
2
1-4/0
213-500
501*
235 5.97
235 5.97
235 5.97
235 5.97
235 5.97
250 6.35
250 6.35
250 6.35
250 6.35
250 6.35
330 8.38
330 8.38
330 8.38
330 8.38
330 8.38
235 5.97
235 5.97
235 5.97
235 5.97
250 6.35
250 6.35
250 6.35
250 6.35
250 6.35
330 8.38
330 8.38
330 8.38
330 8.38
330 8.38
345 8.76
345 8.76
345 8.76
345 8.76
345 8.76
345 8.76
345 8.76
375 9.53
375 9.53
375 9.53
375 9.53
455 11.56
455 11.56
455 11.56
455 11.56
375 9.53
375 9.53
375 9.53
455 11.56
455 11.56
455 11.56
455 11.56
30.0
31.2
31.8
32.4
33.0
32.4
33.0
33.6
34.8
35.4
45.0
45.6
46.2
46.8
47.4
48.6
49.2
49.8
50.4
54.0
54.6
55.2
55.8
64.2
64.8
66.0
66.6
31.2
31.8
32.4
33.0
32.4
33.0
33.6
34.8
35.4
45.0
45.6
46.2
46.8
47.4
48.6
49.2
49.8
50.4
54.0
54.6
55.2
55.8
64.2
64.8
66.0
66.6
*All test values rounded off to 1 decimal place, and voltages are
60 percent of factory test.
**Nonbelted or belted with material other than varnished cloth.
60 percent of factory test.
**Nonbelted or belted with material other than varnished cloth.
35