Cable & Wire Applications
A: Up to a maximum of 1000 N, the operational tensile strain for all cables and wires is calculated as 15 N of tensile load for each mm² of cross-sectional copper area. It is irrelevant whether the cables or wires employed have a solid or flexible conductor, or whether they are intended for fixed or flexible use. During laying or installing of solid conductor core cables, such as NYY for fixed installations, a factor of 50 N/mm² can be used.
Example calculation of maximum tensile load for an ÖLFLEX® CLASSIC 100 5 G 10 mm² (stranded flexible conductor) in operation:
Total copper cross-section: 5 cores x 10 mm² = 50 mm²
Tensile load in Newton: 50 mm² x 15 N = 750 N
Tensile load in kilograms: 750 N : 10 = 75 kg
Calculation of the resulting max. vertical cable suspension length:
Cable weight, version 5 G 10 mm²: 792 kg = 1000 m
Cable length, version 5 G 10 mm²: 75 kg = ??? m
Max. suspension length: (75 x 1000) : 792 = 94.7 m
If a cable features a separate support element, the maximum tensile load specified on the relevant catalogue page applies. Support elements are also required if a lamp, device or control console is to be affixed to a free-hanging cable. In this case, it must be ensured that the combined weights of the cable and the lamp or device do not exceed the maximum recommended tensile strain!
The mechanical tensile strain or force is measured in Newton (N).
A: No, extension or compensating can´t be used in combination with a Pt 100/Pt 1000 temperature probe.
There are two very different ways of performing temperature measurements:
Temperature measurement with a "Pt100/Pt1000 temperature probe or resistance thermometer":
The measurement of temperatures using resistance thermometers is based on the fact that all conductors and semiconductors alter their electrical resistance in line with the current temperature. The Pt100 and Pt1000 sensors are widely used temperature probes that measure changes in resistance of a platinum element at different temperatures. Highly accurate measurements between -200 ℃ and +850°C are often based on the change in electrical resistance of a platinum wire or layer. Unlike with sheathed thermocouples, no so-called extension or compensating cables are used to connect resistance thermometers. Ordinary copper conductors are used instead.
Temperature measurement with a "thermocouple or sheathed thermocouple":
A thermocouple comprises two electrical conductors made of different metals, which are connected at one end (measuring point). The two open ends form the comparison point. In the case of sheathed thermocouples, the two conductors are enclosed in a protective tube, usually made of steel. Thermocouples can measure somewhat higher temperatures (> 1600°C) than resistance thermometers and offer faster response times. Extension and compensating cables are effectively used to extend the thermocouple. The cables are usually connected to a display device, e.g. a galvanometer or an electronic measuring instrument, via a temperature comparison point.