MIL-DTL-13777K
TABLE I. Conductor construction and maximum resistance values.
Conductor
Conductor construction copper strands
Maximum conductor resistance
AWG size
(Ohms per 1000 feet)
Number
Size (AWG)
Tin Coated
0000
427
23
.0562
000
259
22
.0718
00
259
23
.0896
0
259
24
0.113
1
259
25
0.143
2
259
26
0.180
4
133
25
0.283
6
133
27
0.450
8
133
29
0.710
9
133
30
0.914
10
104
30
1.25
12
19
25
1.99
13
19
26
2.43
14
19
27
3.05
15
19
28
3.88
16
19
29
4.82
18
16+3SS
30
7.38
20
16+3SS
32
11.60
3.5.1.1 Copper strands. The copper strands shall be soft annealed, commercially pure copper, free from
splints, flaws, or other imperfections. Each strand shall be drawn and annealed so that strands taken from the
completed cable conform to the values given below. Tests shall be in accordance with 4.8.1.1.
Elongation (in 10 inches)
Minimum %
10
3.5.1.2 Conductor reinforcement. Insulated conductors of 18 size and smaller as specified shall be reinforced
by the addition of 3 steel strands (SS), spring temper, stainless steel wire meeting the requirements of
ASTM-A313/A313M in accordance with table I and in the applicable specification sheet. Stainless steel strands
shall be the same size as the copper stranding and shall be positioned at the center core or in the core and the
first grouping surrounding the center core.
3.5.1.3 Coating. Copper strands shall be tin coated unless otherwise specified. Steel strands shall be coated.
Conductors shall be tested for coating in accordance with 4.8.1.2. Coaxial member strands shall be coated as
specified in MIL-DTL-17 or in the applicable specification sheet.
3.5.1.4 Conductor resistance. The resistance in ohms per 1000 feet at 68ºF for tin coated conductors shall not
3.5.1.5 Joints. There shall be no slices or joints in the conductor as a whole. Not more than one of the strands
in a concentric conductor of 19 strands or less shall be spliced in any one linear foot of the conductor. In rope
stranded conductors the primary groups used in forming the rope shall be considered the equivalent of a solid
strand in concentric stranded conductors. In the case of bunch stranded conductors, a group of individual
strands not exceeding 10 percent of the total number of strands comprising the conductor may be considered
as a primary group. Such a group may be treated on the same basis as set forth for the primary group of a
rope stranded conductor. In all cases, splices or joints shall be so constructed and distributed throughout the
conductor that its diameter and resistance will not be adversely affected and its performance in finished cable
shall insure compliance with requirements specified herein.
3.5.2 Insulation compound. There shall be applied overt the conductor a well centered virgin polyethylene
material in accordance with L-P-390, type II, class L, grade 3 or 4 and meeting the requirements of table II
when tested in accordance with 4.8.2.1.
4
For Parts Inquires call Parts Hangar, Inc (727) 493-0744
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business