| Term | Description |
|---|---|
| MHz | Megahertz (one million cycles per second). |
| Microphonics | Noise in a system caused by mechanical vibrations |
| Microwave | A short (usually less than 30cm.) electrical wave |
| Mil | A unit used in measuring diameter of a wire or thickness of insulation over a conductor. One one thousandth of an inch (.001"). |
| Mis-Match | A termination having a different impedance than that for which a circuit or cable is designed |
| Modules of Elasticity | The ratio of stress to strain in an elastic material |
| Moisture Absorption | The amount of moisture (in percentage) that a material will absorb under special conditions |
| Moisture Resistance | The ability of a material to resist absorbing moisture from the air or when immersed in water |
| Monomer | The basic chemical unit used in building a polymer |
| MP | Designation of multi-purpose cable that meets Vertical Tray flame test |
| MPP | Designation of multi-purpose cable that meets Steiner Tunnel test |
| MPR | Designation of multi-purpose cable that meets Riser flame test |
| MTW | Thermoplastic insulated machine tool wire |
| Multiconductor | More than one conductor within a single cable complex |
| Mutual Capacitance | Capacitance between two conductors when all other conductors including ground are connected together, and then regarded as an ignored ground |
| Mutual Inductance | The ratio of voltage induced in one conductor to the time rate of current change in the separate conductor causing this induction |
| Mylar | DuPont trademark for polyester material used in the form of a tape |
| National Electric Code | National Electrical Code. A consensus standard published by the National Fire Protection Association (NFPA) and incorporated in OSHA regulations |
| NBS | National Bureau of Standards |
| NEC | Abbreviation for National Electrical Code |
| NEMA | National Electrical Manufacturers Association |
| Neoprene | Generic name for polychloroprene synthetic rubber, used for jacketing when suitably compounded |
| NFFP | Abbreviation of National Fire Protection Association |
| Nickel Coated Copper | Bare copper with nickel coating applied overall |
| Noise | Unwanted and/or unintelligible signals picked up on a cable circuit |
| Non-Power Limited Fire Alarm | UL (Underwriter's Laboratories) Standard 1425; National Electric Code (NEC) Article 760 of NFPA 70 |
| Nylon | A group of polymers which are used for wire and cable jacketing |
| Nylon 6 | A polymer that is typicall used over PVC insulation to improve crush resistance |
| OFC/OFN | Designation of Fiber Optic cable which meets Steiner Tunnel test |
| OFCR/OFNR | Designation of Riser Fiber Optic cable which meets Riser flame test |
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