[M]

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 - caused my change in current level, e.g., AC powerline (created magnetic field around that cable) this magnetic field causes the magnetic noise.

Matte Finish PVC - A special formulation of PVC which very closely looks and feels like rubber.

MC Metal-Clad Cable - NEC type designation for power and control cables enclosed in a smooth metallic sheath, welded and corrugated metallic sheath, or an interlocking taper armor.

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.