MIL-DTL-29606A
3.3.1 Concentric stranding. The conductors with 7, 19, or 37 strands shall be concentric-
lay stranded as specified in table II. The direction of lay shall be alternately reversed (true
concentric lay) or in the same direction (unidirectional lay). The strands shall be assembled in a
geometric arrangement of concentric layers, producing a smooth and uniform conductor,
circular in cross-section and free of any crossovers of adjacent strands, high strands, or other
irregularities. The direction of lay of the individual strands in the outer layer of the
concentrically stranded conductors of the finished wire shall be left hand. The length of the
outer layer shall be 8-16 times the maximum conductor diameter as specified in table II.
3.3.2 Rope-lay stranding. The conductors with more than 37 strands shall be rope-lay
stranded as specified in table II. Rope-lay stranded conductors shall be laid up concentrically
with a central member surrounded by one or more layers of helically wound members. The
direction of lay of successive layers shall be alternately reversed (true concentric lay), or in the
same direction (unidirectional lay). The length of the lay of the outer layer of rope-lay stranded
conductor shall be 8-14 times the outside diameter of the completed conductor. The direction of
lay of the outside layer shall be either left or right hand.
3.3.2.1 Rope-lay members. The individual members of the rope-lay stranded conductors
may be either bunched or concentric stranded. The length of lay of the stranded members shall
not be greater than 16 times the outside diameter of the member.
3.4 Splices. For conductor types TCC, SCC, SCC1, NCC, NHC, SCA, SCA1, NCA, NHA,
SCU and NCU, splices in individual strands or members shall be butt brazed, or a similar
process shall be used that does not damage the outer coating integrity. There shall not be more
than one strand-splice in any two lay lengths of a stranded concentric-lay conductor or in any
two lay lengths of any member in a rope-lay conductor, except that not more than one splice of
the entire member shall be permitted in any two lay lengths of rope-lay conductor. Splices in
members of a rope-lay construction shall be finished such that the conductor diameter is not
increased at the point of joining. In no case shall the whole conductor be spliced at any one
point.
For conductor type ALU, splices in individual strands shall not be closer than two lay lengths of
member. Splices in members of rope-lay constructions shall not be closer than 10 feet. In no
case shall the whole conductor be spliced at any one point.
For conductor types KPH, KPS, KNH, and KNS, splices in individual strands or groups of
individual strands shall be butt brazed with silver solder. Splices shall be so constructed and
disposed throughout the conductor that the diameter, configuration, conductor resistance,
flexibility, and mechanical strength of the completed conductor are not adversely affected.
3.5 Properties of individual strands before stranding. The individual strands must comply
with the ASTM or ANSI requirements, when applicable (see table I), and the plating thickness
requirements for the specific conductor.
7
For Parts Inquires call Parts Hangar, Inc (727) 493-0744
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business