Allied Encyclopedia: All About M27500 Cable

Allied EncyclopediaM27500 cable is a popular mil spec wire designed for use as low voltage power cable or signal cable in avionics and aircraft applications. Although the mil spec has technically been replaced by the NEMA WC 27500 cable specification, many people in the industry still call them M27500 cables.

M27500 cable is offered in a variety of constructions, and if you’re unfamiliar with these cables, it can be time-consuming deciding on the perfect fit for your application. Luckily, most of the wire’s features are included right in the part number. M27500 wire part numbers can be broken down into seven sections:

  • Part Identification Number (PIN) – Every part number begins with M27500, showing that the part follows the MIL-C-27500 specification.
  • Identification Method – This single character tells you the wire’s color coding, identification sequence and the percent coverage offered by the shield. M27500 Wire is available with 85% or 95% shield coverage, and with identification methods like striping, color bands, or printed numbers.
  • Conductor Size – This number identifies the AWG size for all the wires in the cable.
  • Basic Wire Specification – A one or two letter code tells you the SAE or military specification for the cable’s inners. For example, the letter “E” is the code for an AS22759/2 component, and “JA” represents a M25038/1 component.
  • Number of Conductors – This number shows how many conductors are in the cable. Shielded M27500 cables can have anywhere from one to fifteen conductors, and unshielded versions can have two to fifteen conductors.
  • Shield Description – A single letter tells you the shield style and material, along with its maximum temperature rating. M27500 cable can be shielded or unshielded. Shielded cables can have single or double shields with round or flat constructions, and are available in a wide range of materials, rated from 150°C to 400°C.
  • Jacket Type – The jacket type is given as a two digit number, representing a single jacket or a double jacket. Cables with a single jacket only have the outer jacket. Cables with double jackets are designed with a jacket between a double shield and a jacket covering the outer shield. From this two digit number, you can learn both the jacket material and the maximum temperature rating for the jacket material.

For example, let’s break down M27500-26RC1S09:

  • “M27500” – Meets the M27500 cable specification
  • “-” – The dash represents the preferred identification method, according to the spec. For this cable, the insulation on the single conductor would be white. (If this cable had more than one conductor, the dash would let us know that the first wire would be white; conductors 2 -10 would each have a colored stripe; and conductors 11 -15 would have double stripes.)
  • “26” – The conductor size is 26 AWG
  • “RC” –AS22759/11 inners
  • “1” – Single conductor cable
  • “S” – Silver-Coated Copper round single shield, rated for up to 200°C
  • “09” – White Extruded Fluorinated Ethylene Propylene (FEP) jacket with a maximum temperature rating of 200°C

Now that you can read M27500 cable part numbers, selecting the appropriate wire for your application will be a lot easier. Allied Wire & Cable is QPL Approved to manufacture many M27500 cables in accordance with WC27500-2012. Design your own Mil-C-27500 Cable with Allied’s NEMA WC 27500 Part Number Builder or search our large selection of M27500 Wire.

Allied Encyclopedia: What is QPL Approved Wire and Cable?

Allied EncyclopediaWhen you’re searching for wire and cable, you’ll probably come across QPL Approved products. But what does this approval tell you about the wire you’re purchasing? The QPL, or Qualified Products List, identifies products that have been pre-tested and proven to follow required specifications before procurement.

Before obtaining QPL Approval, a supplier must submit a sample product for testing. Because QPL materials are most often used in demanding applications where performance is critical, these cables must meet stringent requirements before they are approved. With the QPL approval, buyers can be confident in the quality of the cable and its suitability for use in their applications. The approval also eliminates the need for any additional testing or documentation after the wire is purchased.

So what’s the real difference between QPL and non-QPL wire and cable? Well, non-QPL material tends to be cheaper in price, but QPL wire usually offers better quality and a longer lifespan.

Qualified Products Lists are generally used by the military, local governments, state departments, and federal agencies. If you work for an organization that uses Qualified Products Lists, and buys QPL wire and cable, you will find high quality cable that meets the appropriate standards without the hassle of further testing, saving you and your organization time and money.

Allied Wire is now QPL approved for manufacturing M27500 cable in accordance with WC27500-2012. Build your own M27500 cable with Allied’s NEMA WC 27500 Part Number Builder, or browse our online catalog of MIL-C-27500 Cables.

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