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PRACTICAL ELECTRICAL CALCULATIONS
51
column from the right (according to the type of wire insulation). The correct wire gauge (for solid wire) will then be found in the extreme left-hand column. Table No. 2 gives similar information for stranded wire.
TABLE NO. 2
STANDARDIZED STRANDING
Strands
Cable
Allowable Carrying Capacities
in Amperes
d
-8
u
T3 > V
HH c o ■9*5
No.
Strai
Mils
«8
. 3 OS rt
cfl
«0
JicS
5x«
Table
Varnii
Clol
Insula
r* c
i— i
7/ 25
22
4,490
.075
15
18
20
7/ 32
20
7,150
.096
20
25
25
7/ 40
18
11 ,370
.120
25
30
35
7/ 51
16
18.080
.153
35
40
50
7/ 64
14
28,740
.192
50
60
70
7/ 81
12
45,710
.253
70
85
90
7/ 91
11
58,000
.273
80
95
110
7/102
10
72,680
.306
90
110
130
19/ 64
14
78,030
.320
100
120
150
19/ 72
13
98.380
.360
125
150
175
19/ 81
12
124,900
.405
150
180
210
19/ 91
11
157,300
.455
175
210
250
19/107
•
217.500
.540
225
270
325
19/114
9
248.700
.570
250
300
350
37/ 91
11
306.400
.637
275
330
400
37/ 97
•
347,500
.679
300
360
450
37/102
10
381.200
.714
325
390
500
37/116
•
484.300
.798
400
480
600
61/102
10
633,300
.918
475
565
700
61/107
•
698.000
.963
500
600
750
61/114
9
788,500
1.030
5S0
660
825
61/121
•
893,100
1.090
600
720
900
61/128
8
1,007,000
1.150
650
780
1000
91/114
9
1,191,000
1.250
725
870
1125
91/128
8
1,502,000
1.410
850
1020
1350
127/114
9
1,660,000
1.480
900
1100
1460
127/128
8
2.097,000
1.660
1100
1300
1700
•These individual strands are odd sizes not listed in the American or B. & S. Wire Tables.
(25) The wire "gauge" refers only to the diameter of the wire. To rate wire according to its diameter in mils (thousandths of an inch) would be clumsy: it is easier to talk of No. 8 wire than of wire 128.5 mils diameter. Each size wire in common use is assigned a standard gauge number, as the table shows. The gauge of any wire or strand may be found by stripping away the insulation, measuring the diameter of the metal with a micrometer, and referring to the tables. Or with even less effort, by use of a "wire gauge," illustrated in Fig. 12. The slots, not the round openings, are used for measuring.
The wire (stripped of insulation) must fit the slot