| Term | Description |
|---|---|
| Registration | Alignment of one object with relation to another (also called "Register") |
| Reinforcement | A material used to reinforce, strengthen or give dimensional stability to another material |
| Resin | An organic substance of natural or synthetic origin characterized by being polymeric in structure and predominantly amorphous. Most resins, though not all, are of high molecular weight and consist of long chain or network molecular structure. |
| Resistance | In DC circuits, the opposition a material offers to current (measured in ohms). In AC circuits, resistance is the real component of impedance, and may be higher than the value measured at DC. |
| Retractile Cable | A cable that returns by its own stored energy from an extended condition to its original contracted form |
| RFI | Abbreviation for Radio Frequency Interference |
| RG/U | Abbreviation for Radio Government, Universal. RG is the military designation for coaxial cable and U stands for "general utility." |
| Ribbon Cable | A flat cable of individually insulated conductors lying parallel and held together by means of adhesive or woven textile yarn |
| Ridge Marker | One or more ridges running laterally along the outer surface of a plastic insulated wire for purposes of identification |
| Ringing Out | The process of locating or identifying specific conductive paths by means of passing current through selected conductors |
| Rise Time | The time required for the initially zero potential existing on a transmission line (which is terminated in its characteristic impedance) to change from 10% to 90% of its full DC value after a DC potential source is instantaneously applied |
| RMS or rms | Abbreviation for Root Mean Square |
| Rockwell Hardness | A test for determining hardness in which a hardened steel ball or diamond point is pressed into the material under test |
| Roentgen | The amount of radiation that will produce one electrostatic unit of ion per cubic centimeter volume |
| RoHS | The abbreviation for Restriction of certain Hazardous Substances. It forbids any products entering the EU containing lead (Pb), hexavalent Chromium (Cr +6), cadmium (Cd), other heavy metals, Deca-BDE, PBB and PBDE (chemicals used as flame retardants in compounds). Naturally occurring trace amounts are acceptable. |
| Rope Lay Conductor | A conductor composed of a central core surrounded by one or more layers of helically laid groups of wire |
| Rope Stand | A conductor composed of a center group of twisted strands surrounded by layers of helically laid groups of wire |
| Round Conductor | A conductor whose cross section is substantially circular |
| Routing | The path followed by a cable or conductor |
| Rulan | DuPont's trade name for their flame-retardant polyethylene insulation material |
| Rupture | In the breaking strength or tensile strength tests, the point at which the material physically comes apart (as opposed to elongation, yield strength, etc.) |
| Rural Electrification Administration (REA) | Provided loan programs for electric and telephone service in rural areas, to provide farms with inexpensive electric lighting and power and telephone improvements. |
| SAE | Abbreviation for Society of Automotive Engineers |
| Saudi Arabian Standards Organization (SASO) | For standardization in the Kingdom. |
| SCSI | Small Computer System Interface; ANSI standard which defines mechanical, electrical, and functional requirements for interconnection of small computers and peripherals and other small computer systems |
| Secondary Insulation | A high resistance dielectric material which is placed over primary insulation to protect it from abrasion |
| Self-Extinguishing | The characteristic of a material whose flame is extinguished after the igniting flame is removed |
| Self-Supporting Aerial Cable | A cable consisting of one or more insulated conductors (factory-assembled with a messenger) which supports the assemblage and and may or may not form a part of the electric circuit |
| Self-Supporting Cable | Any assemblage of conductors which incorporates a steel rope or steel sheath for added tensile strength, thus enabling it to be suspended between widely spaced supports |
| Semi-Conducting Tape | A tape of such resistance that when applied between two elements of a cable, the adjacent surfaces of the two elements will maintain substantially the same potential |
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