PTFE has is a group of elements used in the manufacturing process of the insulation for wire and cable that reaches high temperatures of 200°C. PTFE Type E is the most basic type of high temperature wire that comes in awg sizes 26 through 10. Other types of single conductor lead wire in high temperature are Type EE and Type ET which are mostly used for different voltage applications. Type EE is 1000 volts and Type ET is 250 volts along with a few more minor differences.
PTFE cables are known as STJ high temperature cables which stands for Shielded Tape Jacket. Even though it says "shielded" you can still get these PTFE cables in an unshielded version. STJ cables use the same Type E lead wires for the conductors so that all of the insulation in the cable is rated for 200°C.
For various kinds of high temperature wire, the National Electric Code specified that the corrections for the ampacity of each cable should be done if the wire will be exposed to high temperatures. This especially holds true when these wires are exposed to temperatures that are higher than the originally prescribed value. The fixed maximum value for the temperature is at 86 degrees Fahrenheit or 30 degrees Celsius.
Another factor that should be considered is the amount of current that passes through the cable. If you are planning to use higher voltage, it is likely that there will also be a high degree of current that flows through the cable. When this happens, additional heat builds up not only in the wire itself but also in the other structures that surround the wire. These structures include the wire jacket and the wire insulation.
It is important to derate the terminals to improve the ampacity of the wire that you will use. Ampacity is the acceptable value for the amount of current that passes through the wire. Usually, this is measured in Amperes. Another method to improve the ampacity of your wire is through the use of ampacity correction. Ampacity correction is the manipulation of a certain factor in order to adjust the ambient temperature of the high temperature wire. In other words, the fixed value for high temperature tolerace is shifted to accommodate the high amount of current that passes through this wire. As a result, the heat produced is significantly decreased.
In the field of industrial heating, most of the standard classifications of wires can tolerate continuous exposure to temperatures that can be as high as 200 degrees Celsius. Usually, these cables are covered with an insulating jacket made of Silicon, PVC or PTFE. Aside from that, these wires are also equipped with a metallic jacket to preserve the integrity of the insulation material of the conductor.
These wires are also known to tolerate working temperatures that can go as high as 630°C. This occurs when the voltage a maximum of approximately 600 Volts. To withstand these conditions, these wires should be coated with a different type of insulating unit as compared to the conventional wires. Commonly, industrial experts have made use of fiberglass braided jackets and MICA tapes. These are treated with saturants that were proven to withstand high temperatures. To add protection to the integrity of the cables, you may also avail of jackets that are made of stainless steel.
These wires have a lot of uses. In the home setting. It can be used for (1) microwave ovens; (2) stoves; (3) commercial cooking equipment; (4) electrical grilling systems; and (5) coffee makers. In the commercial setting, these can be used for (1) sensors; (2) automotive; (3) oil exploration equipment; (4) computer units; (5) power plants; (6) cellular base stations; (7) turbine power generation systems; and (8) microwave RF systems. Recently, the high temperature wire has also been used in the military field and the commercial aerospace industry.
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