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Term Description
Magnetic Field The region within which a body or current experiences magnetic forces
Magnetic Flux The rate of flow of magnetic energy across or through a surface (real or imaginary)
Magnetic Noise Changes in the current level within a cable caused by an external magnetic field
MCM One thousand circular Mils
Megarad A unit for measuring radiation dosage (equal to one million rads)
Megohm One million ohms
Member A group of insulated wires to be cabled with other stranded groups into multiple-membered cable
Messenger The linear supporting member (usually a high strength steel wire) used as the supporting element of a suspended aerial cable. The messenger may be an integral part of the cable, or exterior to it.
Mho The unit of conductivity. The reciprocal of an ohm.
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
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