7. ELECTRICAL CHARACTERISTICS - Anixter
7. Electrical Characteristics|
7. ELECTRICAL CHARACTERISTICS
7.1 DC Resistance of Plated Copper Conductors
92
7.2 DC and AC Resistance of Copper Conductors
95
7.3 DC and AC Resistance of Aluminum Conductors
97
7.4 Reactance and Impedance at 60 Hz
98
7.5 AC/DC Resistance Ratio at 60 Hz
100
7.6 Temperature Correction Factors for Resistance
101
7.7 Voltage Drop
102
7.8 Maximum Conductor Short Circuit Current
103
7.9 Maximum Shield Short Circuit Current
106
7.10 Resistance and Ampacity at 400 and 800 Hz
107
7.11 Current Ratings for Electronic Cables
108
7.12 Ampacity of Power Cables
109
7.13 Basic Impulse Level (BIL) Ratings
109
| 91
|7. Electrical Characteristics
For a wire or cable to perform its intended function reliably, safely and efficiently, the wire or cable must be selected so that its many electrical, physical, chemical and thermal properties match those of the application. The following sections provide information on some of the most frequently requested electrical parameters.
7.1 DC RESISTANCE OF PLATED COPPER CONDUCTORS
Table 7.1?DC Resistance of Plated Copper Conductors
Wire Size
No. of Wires/Size
Strand
(AWG/kcmil)
(AWG or in.)
Class
777
1,952/24
AAR
750
703/0.0327
H
750
1,862/24
I
750
7,448/30
K
700
703/0.0316
H
700
1,729/24
I
700
6,916/30
K
650
703/0.0304
H
650
1,596/24
I
650
6,517/30
K
646
1,647/24
AAR
600
703/0.0292
H
600
1,470/24
I
600
5,985/30
K
550
703/0.028
H
550
1,372/24
I
550
5,453/30
K
535
1,332/24
AAR
500
427/0.0342
H
500
1,125/24
I
500
5,054/30
K
450
427/0.0325
H
450
1,127/24
I
450
4,522/30
K
444
1,110/24
AAR
400
427/0.0306
H
400
980/24
I
400
3,990/30
K
373
925/24
AAR
350
427/0.0286
H
Nominal Area
(cmils)
788,728 751,711 752,267
744,800 701,988 698,533
691,600 649,684 644,800
651,700 665,404 599,406
593,895 598,500 551,152
554,302 545,300 538,141
449,436 494,912 505,400
451,019 455,319 452,200
448,451 399,826 395,930
399,000 373,709 349,269
Nominal DC Resistance ohms/1,000 ft. at 20?C (68?F)
Silver Plated
? ? ?
? ? ?
Nickel Plated
? ? ?
? ? ?
Tin Plated
0.0139 0.0146 0.0146
0.0148 0.0157 0.0158
?
?
0.0165
?
?
0.0169
?
?
0.0171
?
?
0.0169
?
?
0.0165
?
?
0.0183
?
?
0.0185
?
?
0.0184
?
?
0.0200
?
?
0.0200
?
?
0.0200
?
?
0.0204
?
?
0.0220
?
?
0.0222
?
?
0.0218
?
?
0.0244
?
?
0.0241
?
?
0.0243
?
?
0.025
?
?
0.028
?
?
0.028
?
?
0.028
?
?
0.029
?
?
0.031
Continued on next page >>
92 |
Table 7.1?DC Resistance of Plated Copper Conductors (Continued)
Wire Size
(AWG/kcmil)
350 350 313
300 300 300
262 250 250
250 4/0 4/0
3/0 3/0 2/0
2/0 1/0 1/0
1 1 2
2 2 3
4 5 6
8 8 8
10 10 10
12 12 12
12 12 14
No. of Wires/Size
(AWG or in.)
882/24 3,458/30 777/24
427/0.0265 735/24 2,989/30
646/24 427/0.0242
637/24
2,499/30 2,109/30 427/0.0223
1,665/30 427/0.0198 1,330/30
427/0.0177 1,045/30 259/0.0202
817/30 259/0.018 665/30
259/0.016 133/0.0223 133/0.0199
133/25 133/0.0158
133/27
19/0.0295 37/0.0211 133/29
7/0.0385 19/0.0234
37/26
7/0.0305 19/25 19/0.0185
37/28 65/30 7/0.0242
Strand
Nominal Area
Class
(cmils)
I
356,337
K
345,800
AAR
313,916
H
299,861
I
296,947
K
298,900
AAR
260,990
H
250,068
I
257,354
K
249,900
K
210,900
H
212,343
K
166,500
H
167,401
K
133,000
H
133,775
K
104,500
H
105,682
K
81,700
H
83,916
K
66,500
H
66,304
H
66,140
H
52,669
H
42,615
H
33,202
H
26,818
C
16,535
D
16,473
H
16,983
B
10,376
C
10,404
D
9,354
B
6,512
C
6,088
C
6,503
D
5,874
K
6,500
B
4,099
7. Electrical Characteristics|
Nominal DC Resistance ohms/1,000 ft. at 20?C (68?F)
Silver Plated
Nickel Plated
Tin Plated
?
?
0.031
?
?
0.032
?
?
0.035
?
?
0.037
?
?
0.037
?
?
0.037
?
?
0.042
?
?
0.043
?
?
0.043
?
?
0.044
0.052
0.053
0.052
0.052
0.053
0.052
0.066
0.067
0.069
0.066
0.067
0.066
0.083
0.084
0.088
0.083
0.084
0.082
0.105
0.107
0.116
0.105
0.107
0.103
0.134
0.137
0.144
0.134
0.137
0.129
0.165
0.168
0.177
0.165
0.168
0.164
0.165
0.168
0.164
0.165
0.168
0.205
0.249
0.259
0.264
0.249
0.259
0.325
0.393
0.409
0.417
0.628
0.689
0.640
0.630
0.692
0.655
0.616
0.642
0.654
1.00
1.10
1.02
1.00
1.10
1.03
1.13
1.18
1.20
1.59
1.75
1.65
1.71
1.78
1.81
1.60
1.75
1.70
1.80
1.87
1.91
1.80
1.87
1.61
2.53
2.69
2.63
Continued on next page >>
| 93
|7. Electrical Characteristics
Table 7.1?DC Resistance of Plated Copper Conductors (Continued)
Wire Size
No. of Wires/Size
Strand
(AWG/kcmil)
(AWG or in.)
Class
14
19/27
C
14
19/0.0147
C
14
37/0.0105
D
14
41/30
K
16
7/0.0192
B
16
19/29
C
16
19/0.0117
C
16
26/30
K
18
7/0.0152
B
18
7/26
B
18
16/30
K
18
19/30
C
18
19/0.0092
C
20
7/.28
B
20
10/30
K
20
19/32
C
22
7/30
B
22
19/34
C
24
7/34
B
24
19/36
C
25
7/0.0067
B
26
7/34
B
26
19/38
C
28
7/36
B
28
19/40
C
30
7/38
B
30
19/42
C
32
7/40
B
34
7/42
B
36
7/44
B
Note: AAR ? American Association of Railroads Strand Classes B, C, D, H, I and K per ASTM
Nominal Area
(cmils)
3,831 4,105 4,079
4,100 2,580 2,426
2,600 2,600 1,617
1,769 1,600 1,900
1,608 1,111 1,000
1,216 700 754
448 475 314
277 304 175
182 112 118
67 43 28
Nominal DC Resistance ohms/1,000 ft. at 20?C (68?F)
Silver Plated
Nickel Plated
Tin Plated
2.70
2.81
2.86
2.62
2.65
2.78
2.62
2.65
2.59
2.62
2.65
2.58
4.02
4.28
4.27
4.23
4.41
4.49
4.14
4.20
4.39
4.14
4.20
4.07
6.58
6.67
6.99
5.86
6.10
6.22
5.86
6.10
6.61
5.38
5.60
5.77
6.69
6.82
7.18
9.27
9.65
9.84
?
?
10.58
8.53
9.07
9.15
14.60
15.20
15.60
13.70
14.60
14.70
23.10
24.60
24.80
21.50
22.90
23.10
33.00
34.80
36.40
37.10
39.50
39.80
33.30
36.60
35.70
58.40
62.10
66.50
54.60
60.00
58.60
90.30
99.20
96.20
82.70
94.00
88.80
148.0
163.0
159.0
225.0
256.0
241.5
244.0
391.0
369.2
94 |
7.2 DC AND AC RESISTANCE OF COPPER CONDUCTORS
7. Electrical Characteristics|
Table 7.2?DC and AC Resistance of Copper Conductors, Nominal Ohms Per 1,000 ft.
20?C
Conductor
Size
Temperature
DC
(AWG/kcmil)
40 38 36
34 32 30
28 26 24
22 20 18
16 14 12
10 8 6
4 2 1
1/0 2/0 3/0
4/0 250 300
1,080.0 648.6 414.8
260.9 164.1 103.2
64.9 40.8 26.1
16.4 10.3 6.54
4.1 2.57 1.62
1.17 0.638 0.403
0.253 0.159 0.126
0.1 0.0794 0.0629
0.05 0.0423 0.0353
60?C Conductor Temperature
75?C Conductor Temperature
90?C Conductor Temperature
DC
60 Hz AC
DC
60 Hz AC
DC
60 Hz AC
*Single MultiCond. Cond.
*Single MultiCond. Cond.
*Single MultiCond. Cond.
1,250.0 ?
? 1,314.0
?
?
1,378.0 ?
?
750.7 ?
?
789.1
?
?
827.3 ?
?
480.1 ?
?
504.6
?
?
529.1 ?
?
302.0 ?
?
317.4
?
?
332.8 ?
?
189.9 ?
?
199.6
?
?
209.3 ?
?
119.4 ?
?
125.5
?
?
131.6 ?
?
75.1 ?
?
47.2 ?
?
30.2 ?
?
79.0
?
?
49.7
?
?
31.8
?
?
82.8 ?
?
52.1 ?
?
33.3 ?
?
19.0 ?
?
11.9 ?
?
7.57 ?
?
20.0
?
?
12.5
?
?
7.96 ?
?
20.9 ?
?
13.1 ?
?
8.34 ?
?
4.75 ?
?
2.98 2.98 2.98
1.88 1.88 1.88
4.99 ?
?
3.14 3.14 3.14
1.97 1.97 1.97
5.23 ?
?
3.29 3.29 3.29
2.07 2.07 2.07
1.18 1.18 1.18 0.744 0.744 0.744 0.466 0.466 0.466
1.24 1.24 1.24 0.783 0.783 0.783 0.491 0.491 0.491
1.31 1.31 1.31 0.822 0.822 0.822 0.515 0.515 0.515
0.295 0.295 0.295 0.184 0.184 0.185 0.147 0.147 0.148
0.310 0.310 0.31 0.195 0.194 0.196 0.154 0.154 0.155
0.325 0.325 0.325 0.203 0.203 0.205 0.162 0.162 0.163
0.116 0.0923 0.073
0.116 0.0923 0.073
0.118 0.0950 0.0759
0.122 0.0971 0.0769
0.122 0.124 0.0971 0.1 0.0769 0.0799
0.128 0.128 0.102 0.102 0.0807 0.0807
0.13 0.105 0.0839
0.0579 0.049 0.0409
0.0579 0.0492 0.0411
0.0608 0.0519 0.0437
0.061 0.0516 0.0431
0.061 0.064 0.0518 0.0547 0.0433 0.0461
0.0639 0.0639 0.0541 0.0543 0.0452 0.0454
0.0671 0.0573 0.0483
Continued on next page >>
| 95
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