MIL-DTL-24640C
UNDERWRITERS LABORATORES INC. (UL)
UL 1581
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Reference Standard for Electrical Wires, Cables, and Flexible Cords
UL 1685
Standard for Vertical-Tray Fire-Propagation and Smoke-Release Test for
Electrical and Optical-Fiber Cables
(Copies of these documents are available from COMM 2000, 1414 Brook Drive, Downers Grove, IL 60515 or
online at www.ul.com.)
2.4 Order of precedence. Unless otherwise noted herein or in the contract, in the event of a conflict between
the text of this document and the references cited herein (except for related specification sheets), the text of this
document takes precedence. Nothing in this document, however, supersedes applicable laws and regulations unless
a specific exemption has been obtained.
3. REQUIREMENTS
3.1 Specification sheets. The individual item requirements shall be as specified herein and in accordance with
the applicable specification sheet. In the event of any conflict between the requirements of this specification and the
specification sheet, the latter shall govern.
3.2 Qualification. Cables furnished under this specification shall be products that are authorized by the
qualifying activity for listing on the applicable qualified products list before contract award (see 4.3 and 6.5).
3.3 Materials. Materials used in construction of those cables furnished under this specification shall be in
accordance with the requirements shown in the applicable specification sheets and as follows.
3.3.1 Conductors. Conductor material shall be copper and shall be as specified in 3.3.1.1 through 3.3.1.3.
3.3.1.1 Uncoated copper. Copper conductors shall be soft or annealed in accordance with ASTM B3.
3.3.1.2 Coated conductor. Coated copper conductors shall be tinned in accordance with ASTM B33.
3.3.1.3 Conductor stranding. The size and quantity of individual conductor strands shall be in accordance with
ASTM B8 or ASTM B286 as specified in the specification sheet. Strands shall be free from lumps, kinks, splits,
scraped or corroded surfaces, and skin impurities.
3.3.2 Insulation. Insulation shall be in accordance with MIL-DTL-81381, SAE-AS81044/9, or
SAE-AS81044/12 as specified in the applicable specification sheet. All physical and electrical properties shall be as
specified by the specification sheet.
3.3.3 Jackets. The material used for the cable jacket shall be crosslinked polyolefin which shall have the
physical and electrical properties as required by the applicable specification sheet and as specified herein. The color
of the cable jacket shall be black or white, as specified (see 6.2).
3.3.4 Shields. Conformance to the materials, constructions, and coverage for shields of insulated conductors,
groups of insulated conductors, and overall cable and cord shall be as specified in the specification sheet. When
AWG sizes are specified for wire shields, they shall be in accordance with ASTM B258.
3.3.5 Fillers. Unless otherwise specified in the applicable specification sheet, fillers for cables intended for
flexing applications, only fibrous or paper fillers shall be used. For non-flexing types, solid or fibrous filler
materials shall be acceptable.
3.3.5.1 Fibrous or paper fillers. Fibrous and paper fillers shall be treated for flame or moisture resistance, or a
combination of both, to meet the requirements for the particular type of cable.
3.3.5.2 Nonfibrous fillers (solids). Nonfibrous fillers shall consist of elastomeric material which is removable
from insulation of conductors and insulating coverings over the shields. The acceptability of the material shall be in
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