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22 Posts in this encyclopedia categoryTalcum
Talcum is a mineral, slightly greasy natural product. It is used in powder form as a release agent or lubricant. Mixtures with mica are also in use. To prevent the hot-applied sheath material from sticking to the core insulation when sheathing a core cable, the cable is first dusted with talcum powder. In addition to the separating effect, the friction between the individual cable elements is also greatly reduced, thereby improving flexibility and strippability. (All information without guarantee)
Temperature range
If the temperature falls below the specified minimum temperature range, the cables must not be subjected to any mechanical force, otherwise the insulation will break (rigidity of the polymer chains). If the maximum temperature is exceeded, the insulation begins to melt (dissolution of polymer chains). The resistance of the conductor also changes with every change in temperature. (All data without guarantee)
Temporary dielectric strength
Highest value of a temporary voltage that does not cause insulation damage under specified conditions. (All data without guarantee)
Terminating resistor
A resistor for cable termination on Industrial Ethernet triaxial cables. (All data without guarantee)
Test voltage
The test voltage is the voltage value with which a wire or cable can be tested without changing the insulation properties. The test voltage is usually set 3 - 5 times higher than the nominal voltage of the wires/cables. (All data without guarantee)
Thermoplastics
Thermoplastics are non-cross-linked macromolecular compounds. By heating them, it is always possible to return them to a plastic state. They are mainly used for sheathing and insulating cables and wires. (All data without guarantee)
Three-phase current
Three-phase current is created by linking three alternating currents with the same oscillation values and the same frequencies. Also known as polyphase alternating current. (All information without guarantee)
Tightening torque
Force with which a screw must be tightened in order to achieve a perfect connection. (All information without guarantee)
Torsion
Twisting of the wires around the longitudinal axis. VDE0298, Part 300, Section 5.4.4: Flexible wires are generally not intended for torsional stresses. In cases where such torsional stresses cannot be avoided, the structure of the cable and the type of installation should be agreed between the user and the cable manufacturer. (All information without guarantee)
Transfer impedance
The transfer impedance (coupling resistance) is the decisive size for the quality of the shield and is frequency-dependent. It is the ratio of the voltage drop along a shield on the disturbed side (outside) to the interference current on the other side (inside) of the shield. The coupling resistance is determined by the structure of the shield, the skin effect and the capacitive coupling. (All data without guarantee)
Transient overvoltages
Overvoltage lasting a few milliseconds or less, oscillating or non-oscillating. As a rule, these are heavily attenuated. The overvoltage can be caused by a switching operation, a fault, a lightning discharge or as an intentionally generated overvoltage. (All information without guarantee)
Transmission path
Complete transmission path that connects any two application-specific devices with each other. Device connection cables are part of the transmission path. (All information without guarantee)
Transmission rate
Also referred to as bandwidth, the speed of data transmission. The following transmission rates are possible with Ethernet: 10 Mbit/s (Ethernet), 100 Mbit/s (Fast Ethernet), 1,000 Mbit/s (Gigabit Ethernet), 10,000 Mbit/s (10 Gigabit Ethernet). (All data without guarantee)
Twisted pair
Describes a point-to-point connection technology for Ethernet using a data cable with twisted conductor pairs (shielded or unshielded). Due to the twist in the conductor pairs, EMC interference coupling in the individual conductor loops has the opposite effect and cancels itself out by forming differences. (All data without guarantee)
Types of reinforcement
The most common types of reinforcement are steel flat wire, steel strip, steel profile wire and steel round wire reinforcement with an outer protective cover. There are also steel wire reinforcements with counter helix (steel strip) but without outer protective sheaths (for interior spaces). (All information without guarantee)