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MIL-DTL-27500 (NEMA WC27500) Cable Designation



Image All MIL-DTL-27500 cables are designated by a combination of digits and letters (not to exceed 16) which indicates the exact construction of each cable. Please note the following example of a MIL-DTL-27500 cable.

Cable Description: M27500 A 22 SB 3 T 23
(1) (2) (3) (4) (5) (6) (7)

Classification: The cable will be of the following types and will be furnished in the basic wire size, type, number of wires, and shield and jacket styles, as specified.
  • Unjacketed: 2 to 15 color coded wires, spirally laid without an overall outer jacket.
  • Jacketed: 2 to 15 color coded wires, spirally laid with an overall outer jacket.
  • Shielded: A single wire, or 2 to 15 color coded wires spirally laid, with one or two overall shields.
  • Shielded and Jacketed: A single wire, or 2 to 15 color coded wires spirally laid, with one or two shields and one or two jackets.
Specification Number (1): All cables will carry this prefix.

Identification Method (2):
When 85% minimum shield coverage is required:
    "-" designates the preferred identification method (white wire with colored stripes) using Table IIIA;
    "F" designates the preferred identification method (white wire with colored stripes) using Table IIIB;
    "A" designates optional identification method A (solid colored wires) using Table IIIA;
    "G" designates optional identification method A (solid colored wires) using Table IIIB;
    "B" designates optional identification method B using Table IIIC;
    "K" designates optional identification method C;
    "L" designates optional identification method D (see mil spec for band marking specification).
When 90% minimum shield coverage is required:
    "C" designates the preferred identification method (white wire with colored stripes) using Table IIIA;
    "H" designates the preferred identification method (white wire with colored stripes) using Table IIIB;
    "D" designates optional identification method A (solid colored wires) using Table IIIA;
    "J" designates optional identification method A (solid colored wires) using Table IIIB;
    "E" designates optional identification method B using Table IIIC;
    "M" designates optional identification method C;
    "N" designates optional identification method D (see mil spec for band marking specification).
Conductor Size (3): This position identifies the wire size. Wire size depends upon the basic wire specification (see 4).

Basic Wire Specification (4): The component wires are identified by a one or two letter code. A listing of the basic wire specifications can be found in Table I.

Number of Conductors (5): M27500 currently specifies from 1 to 15 conductors for shielded or shielded and jacketed cables, and from 2 to 15 for unshielded unjacketed or unshielded jacketed cables. Cables with 10 to 15 conductors are limited to 12 AWG and smaller.

Shield (6): The specific shield style and material are designated by a single letter code and are detailed inTable I A.

Jacket (7): Cable jacketing materials are specified by a two digit code and are detailed in Table I B.



 MORE IMAGES 

·  Table I - Basic Wire Specifications

·  Table I A - Shield Material

·  Table I B - Jacket Material and Color

·  Table II - Allowable Shield and Jacket Materials for Each Basic Type Wire

·  Table III A - Circuit Identification Colors for Basic Wires in Cable

·  Table III B - Circuit Identification Colors for Basic Wires in Cable

·  Table III C - Color of Insulation for Identification of Wire Sizes


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MIL-DTL-27500 Cable Designations
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