MIL-DTL-24643C
TABLE I. Navy standard sizes.
Conductor cross-
Maximum conductor
Cond.
Wt. per
Conductor
No. of
Std. dia.
sectional area (circular
resistance D.C. per
dia.
1000 ft.-
size Navy
stds.
nom.
mils)
1000 ft. at 25 °C
nom.
lbs. appr.
standard
(min.)
(inch)
(inch)
Nom. 1/
Min.
Bare
Coated
Concentric lay stranded
30 (19)
19
0.040
0.202
30,860
30,240
0.358
0.365
95
400 (127)
127
0.057
0.742
413,600
405,400
0.0268
0.0273
1,300
Bunch lay stranded
9 (90)
90
0.010
0.120
9,045
8,864
1.22
1.28
28
14 (140)
140
0.010
0.145
14,070
13,790
0.786
0.823
43
Rope lay stranded
42 (209)
209
0.014
0.260
42,100
41,280
0.272
0.284
130
60 (304)
304
0.014
0.310
61,200
60,040
0.187
0.196
190
83 (418)
418
0.014
0.380
84,230
82,600
0.136
0.142
270
133 (684)
684
0.014
0.480
137,800
135,100
0.0830
0.0867
440
150 (760)
760
0.014
0.510
153,100
150,100
0.0747
0.0780
490
200 (988)
988
0.014
0.580
199,100
195,100
0.0575
0.0600
630
250 (1254)
1254
0.014
0.680
252,700
247,700
0.0453
0.0472
800
400 (2052)
2052
0.014
0.850
413,500
405,300
0.0277
0.0289
1,300
800 (4033)
4033
0.014
1.150
812,700
796,500
0.0141
0.0148
2,600
NOTE:
1/
Values are for information only.
3.3.3 Separators. Separators may be used at manufacturer's option where required to meet insulation
removability requirements. Separators employed directly over conductors shall be applied to give not less than 100
percent coverage to the conductors. When used, separator shall be white (opaque).
3.3.4 Insulation.
3.3.4.1 Insulation type. Insulation type shall be as specified on the applicable specification sheet except
silicone rubber-coated glass fabric tape insulation shall be as specified in 3.3.2.1. Unless otherwise required in the
specification sheet, insulations shall meet the applicable requirements below. Conductor insulation shall be readily
removable by conventional wire stripping devices without damage to the conductor leaving no visible insulation
residue when examined without magnification. Tapes used as insulation shall be smooth and free from wrinkles.
The tape shall not split, crease, or tear when the insulated conductor is subjected to a 12-13X bend radius.
3.3.4.2 Silicone rubber-coated glass fabric tape. The silicone rubber-coated glass fabric tape insulation shall,
before application to a conductor, have a dielectric strength of not less than 475 V per mil for tapes which are less
than 8.8 mils thick, and 575 V per mil for tapes which are 8.9 mils or more in thickness. These dielectric strength
values shall be met after the tapes have been conditioned for 24 hours at 23 degrees Celsius (°C) and 96 percent
relative humidity and tested while maintaining temperature and humidity conditions in accordance with the short
time dielectric breakdown test. Silicone rubber glass tapes shall be held from unwinding from conductors when the
conductors are exposed and subjected to normal handling during splicing and terminating. Other physical and
electrical properties shall be as specified in the specification sheets.
6
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