MIL-DTL-55446D
2.3 Non-Government publications. The following documents form a part of this document to the
extent specified herein. Unless otherwise specified, the issues of these documents are those cited in the
solicitation or contract.
NCSL International
NCSL-Z540.1
-
Calibration Laboratories and Measuring and Test Equipment,
General Requirements.
(Copies of this document are available from https://www.ncsli.org or from the National Conference of
Standards Laboratories (NCSL), 2995 Wilderness Place, Suite 107, Boulder, CO 80381-5404.)
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, 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 Description. The cables covered by this specification are switchboard cables, the conductors of
which are No. 22 AWG solid copper wire, tinned and individually insulated with an extruded polyvinyl
chloride (PVC) covering. The insulation is color coded for convenient identification of pairs and single
wires. The core is made up of pairs and single wires as required and cabled either concentrically in
layers or in unit construction, depending on its size. The individual units of unit-constructed cables are
bound with color coded spaced servings of yarn or polyethylene tape binders. The core is covered with
an overlapped spiral winding of paper or, at the option of the manufacturer, polyester tape. Over this
polyester covering and beneath the outer sheath is a nylon ripcord to facilitate stripping. The outer
sheath is an extruded PVC jacket.
3.2 Recycled, recovered, or environmentally preferable materials. Recycled, recovered, or
environmentally preferable materials should be used to the maximum extent possible, provided that the
material meets or exceeds the operational and maintenance requirements and promotes economically
advantageous life-cycle costs.
3.3 Construction. The cable shall be made up of the number of pairs and single wires as required
(see 1.2). The pairs shall be twisted, with the maximum length of pair twist not to exceed 6 inches
(152.40 mm). To minimize cross talk, each pair in a concentric type cable or each pair in a unit (for unit
construction) shall have a twist with a length of lay different from that of any other pair in the cable or unit,
respectively.
3.4. Materials. The materials for the cables covered by this specification shall be as specified herein.
When a definite material is not specified, the best material commercially available for the purpose
intended shall be used.
3.5 Conductors. Each conductor of the cables shall be No. 22 AWG solid, soft, or drawn and
annealed tinned copper wire conforming to A-A-59551.
3.5.1 Joints in conductors. If joints are necessary, the joints shall be made by brazing with silver
solder or by welding. The diameter of the wire measured at the joint shall be within the maximum
diameter tolerance for the conductors (see 3.7.2). The conductor surface at the joint shall be smooth and
free from lumps and sharp projections. The tensile strength of a section of the conductor containing a
joint shall be not less than 90 percent of the tensile strength of an adjacent section of the conductor of
equal length that is free from joints. The resistance of a section of the conductor not exceeding 6 inches
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