77 General Information Cord & Cordset Glossary SO: Hard-service cord, same construction as type S except oil-resistant Carolprene® jacket. 600V, 60˚ to 90˚C SOO: Same as SO with oil-resistant insulation. SOOW: Same as SOO with the added UL + CSA Approval for outdoor use and water resistance. SOW: Same as SO with the added UL and CSA approval for outdoor use and water resistance. SP-1: All-rubber, parallel-jacketed two-conductor light-duty cord for pendant or portable use in damp locations. 300V. SP-2: Same as SP-1, but heavier construction, with or without third conductor for grounding purposes. 300V. SP-3: Same as SP-2 but heavier construction for refrigerators or room air conditioners. 300V. SPT-1: Same as SP-1, except all-thermoplastic. 300V. With or without third conductor for grounding. SPT-2: Same as SP-2 except all-thermoplastic. 300V. With or without third conductor for grounding. SPT-3: Same as SP-3, except all-thermoplastic. 300V. With or without third conductor for grounding. Span: In flat conductors, distance between the reference edge of the first and the last conductor. In round conductors, distance between centers of the first and last conductors. Spark Test: A test designed to locate pin-holes in the insulation of a wire or cable by application of a voltage for a very short period of time while the wire is being drawn through the electrode field. Specific Gravity: The ratio of the density (mass per unit volume) of a material to that of water. Spiral Shield: A metallic shield of fine-stranded wires applied spirally rather than braided. Spiral Stripe: A color-coding stripe applied helically to the surface of an insulated wire or cable. Spiral Wrap: The helical wrap of a tape or thread over a core. Splice: A connection of two or more conductors or cables to provide good mechanical strength as well as good conductivity. SRD: Portable range or dryer cable. Three or four rubber-insulated conductors with rubber or neoprene jacket, flat or round construction. 300V, 60°C. SRDT: Same as SRD, except all-thermoplastic with a maximum temperature of 90°C. ST: Hard-service cord, jacketed, same as type S except all-plastic construction. 600 V, 60°C to 105°C. Standing Wave Ratio: In a transmission line, waveguide or analogous system, a figure of merit used to express the efficiency of the system in transmitting power. Stay Cord: A component of a cable used to anchor the cable ends at their points of termination and to keep any pull of the cable from being transferred to the electrical connections. STO: Same as ST but with oil-resistant thermoplastic outer jacket. 600 V, 60°C. Strand: One of the wires of any stranded conductor. Strand Lay: The distance of advance of one strand of a spirally stranded conductor, in one turn, measured axially. Stranded Conductor: A conductor composed of groups of wires twisted together. Strap: Square- or rectangular-section bare conductor manufactured and used in coil form. Strip: To remove insulation from a cable. Structural Return Loss: Backward-reflected energies from uneven parts of the cable structure are termed structural return loss. Surface Resistivity: The resistance of a material between two opposite sides of a unit square of its surface. It is usually expressed in ohms. SV: Vacuum cleaner cord two- or three- conductor rubber-insulated. Overall rubber jacket. For light duty in damp locations. 300 V, 60°C. SVO: Same as SV except Carolprene jacket, 300 V, 60°C. SVT: Same as SV except all-plastic construction. With or without third conductor for grounding purposes only. 300 V, 60°C to 90°C. Sweep Test: A test given to check attenuation by oscilloscope, as in coaxial cable. TEW: Canadian Standard Association type appliance wires. Solid or stranded single- conduc tor, plastic-insulated. 600 V, 105°C. TF: Fixture wire, thermoplastic-covered solid or 7- strands. 60°C. TFE: Teflon® (tetrafluoroethylene). TFF: Same as TF but flexible stranding. 60°C. THHN: 90°C, 600 V nylon jacketed building wire. THW: Thermoplastic vinyl-insulated building wire. Flame-retardant, moisture- and heat-resistant. 75°C. Dry and wet locations. THWN: Same as THW but with nylon jacket overall. 75°C. TW: Thermoplastic vinyl-jacketed building wire, moisture-resistant 60°C. Take-Up: The process of accumulating wire or cable onto a reel, bobbin or some other type of pack. Also, the device for pulling wire or cable through a piece of equipment or machine. Tank Test: A voltage dielectric test in which the test sample is submerged in water and voltage is applied between the conductor and water as ground. Tape: A relatively narrow woven or cut strip of fabric, paper or film material. Tape Cable: A form of multiple-conductor consisting of parallel metal strips imbedded in insulating material. Tape Wrap: A spirally applied tape over an insulated or uninsulated wire. Taped Insulation: Insulation of helically wound tapes applied over a conductor or over an as sembled group of insulated conductors. Taping: Process of insulating continuous- length, large-diameter wires with tape of nonextrudable materials. Tear Strength: The force required to initiate or continue a tear in a material under specified conditions. Teflon®: DuPont’s trade name for fluorocarbon resins. FEP, PFA and TFE are typical materials. Tefzel: DuPont’s trade name for a fluorocarbon material typically used as a wire wrap insulation.
