MIL-DTL-25038J
3.4.1.1 Stranding.
3.4.1.1.1 Concentric-lay. Wire sizes 22 through 12 shall be constructed with concentric-lay
conductors and as specified in table II. Concentric-lay shall be interpreted to be a central core surrounded
by one or more layers of helically wound strands. It is optional for the direction of lay for successive layers
to be alternately reversed (true concentric-lay) or to be in the same direction (unidirectional lay). If the
direction of lay for the successive layers is the same, the pitch or length of lay shall increase with each
successive layer. The direction of lay of individual strands in the outer layer of the concentrically stranded
conductors of finished wire sizes 22 through 12 shall be left hand. The length of lay in the outer layer shall
be not less than 8 nor more than 16 times the maximum conductor diameter specified in table II.
3.4.1.1.2 Rope lay. Wire sizes 10 through 0000 shall be rope lay and as specified in table II and as
follows:
a. Rope lay stranded conductors shall be laid up concentrically with a center core surrounded by one
of more helically wound members. It is optional for the direction of lay for successive layers to be
alternately reversed (true concentric-lay) or to be in the same direction (unidirectional lay). The length of
lay of the outer layer of rope lay stranded member forming the conductor shall be not less than 8 nor
more than 14 times the outside diameter of the completed conductor. The direction of lay of the outside
layer may be either left or right hand.
b. Members of rope lay stranded conductors. The length of lay of the conductors composing the
stranded members shall be not greater than 16 times the outside diameter of the member. Stranding of
the individual members may be concentric or bunch.
3.4.1.2 Splices. Splices in individual strands or members shall be butt brazed. There shall be not
more than one strand splice in any 10-foot length of a stranded concentric-lay conductor. There shall not
be more than one splice in any 10-foot length of any member in a rope lay conductor, except that not
more than one splice of an entire member shall be permitted in any 10 feet of a rope lay conductor.
Splices in members of a rope lay construction shall be so finished that the conductor diameter is not
increased at the point of brazing. In no case shall the whole conductor be spliced at one point.
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