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| Term | Description |
|---|---|
| Irradiation | In insulations, the exposure of the material to high energy emissions for the purpose of favorably altering the molecular structure by crosslinking |
| ISA | Instrument Society of America |
| ISO | International Standards Organization |
| J-Fold | A type of fold allowing for metal-to-metal contact |
| Jacket | An outer covering, usually nonmetallic, mainly used for protection against the environment |
| JAN Specification | Joint Army-Navy specification (forerunner of present Military Specifications). |
| Jumper Cable | A short cable interconnecting two wiring boards or devices |
| Kilo | A numerical prefix denoting 1000 |
| Lacquer | A liquid resin or compound applied to textile braid to prevent fraying, moisture absorption, etc. |
| Laminated Tape | A tape consisting of two or more layers of different materials bonded together |
| Lay | The axial distance required for one cabled conductor or conductor strand to complete one revolution about the axis around which it is cabled |
| Lay Direction | The twist in the cable as indicated by the top strands while looking along the axis of the cable away from the observer (described as "right hand" or "left hand") |
| Leakage Current | The undesirable flow of current through or over the surface of an insulation |
| Life Cycle | A test to determine the length of time before failure in a controlled (usually accelerated) environment |
| Limits of Error | The maximum deviation (in degrees or percent) of a thermocouple or thermocouple extension wire from standard emf-temperature to be measured |
| LOCO | Abbreviation for "loss of coolant accident"; a system malfunction associated with nuclear generating stations |
| Longitudinal Shield | A tape shield (flat or corrugated) applied longitudinally with the axis of the core being shielded |
| Loop Resistance | The total resistance of two conductors measured round trip from one end |
| Loss Factor | The product of the dissipation and dielectric constant of an insulating material |
| Low Loss Dielectric | An insulation material that has a relatively low dielectric loss, such as Polyethylene or Teflon |
| Low Smoke Zero Halogen (LSZH) | The destination for materials that emit little or no smoke |
| 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. |
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