Charles Teague posted an update 3 months, 1 week ago
High-temperature insulated wire isn’t an one-size-fits-all product. Based on the application, different facets will go into selecting the most appropriate type of wire to find the task finished right. On this page, we’ll take a closer look at what these factors are and the way they can aid in selecting the best high-temperature insulated wire to your specific situation.
Factor #1: Concept of Electrical Requirements – Operating voltage, conductor temperature rating and current-carrying capacity (aka ampacity) must be met when scouting for high-temperature insulated wire. Such wiring is labeled having a temperature rating, which can be dependant on a combination of ambient heat and current-generated heat. Ambient heat is a result of the approval being performed whereas current-generated heat is calculated by matching conductor material and diameter to service amperage. It is very important note that because of the difficulty in pinning down exact current-carrying capacity, manufacturers often specify higher capacity conductors than theoretical calculations would indicate.
Factor #2: Environmental Conditions – What are you doing inside wire is not the only consideration with regards to selecting the most appropriate high-temperature insulated wire. External environmental factors can also be important. That is because they’re able to have a damaging effect on both the wire’s insulation as well as its interior circuitry. Ambient heat, moisture, abrasion, thermal stability, chemical attach, mechanical abuse, low temperature, flame resistance, ease of stripping terminating and routing are all environmental conditions that should be paid for when selecting high-temperature insulated wire. A few of these factors are discussed in greater detail further on in this article.
Factor #3: Conductor Material Type – The wire’s conductor material determine the maximum temperature it can withstand. Situations that require the wire to endure the best of temperatures, like high-rise alarms in case of a fireplace, will be more reliably served with nickel-coated copper and nickel conductors, as both versions can endure temperatures around 550 degrees Celsius. Copper, nickel-plated and iron conductors alternatively can take up under only an upper selection of 200 to 250 degrees Celsius.
Factor #4: Current-Carrying Capacity or Ampacity – A portion of the environmental conditions talked about above have an impact on high-temperature insulated wire’s power to carry current. Because of this, they should be weighed in to the equation. Ampacity is measured because current a conductor can hold prior to the combined temperature of both conductor and insulation rises above a permitted limit.
Conductor size and material, amperage, ambient temperature and insulation type will all play a role may be the wire’s ampacity. The conductor’s diameter and mass would be the most influential size considerations. Small they may be, the lower the high-temperature insulated wire’s ampacity. As previously talked about inside the Factor #3 section, a conductor’s material has a strong relating just how much temperature the wire can withstand which temperature range varies widely. Likewise, different materials produce wide fluctuations within the current-carrying capacity in the wire as well.
Finally, the type of insulation utilized in the wire determines the amount heat it dissipates and, in turn, the ampacity. The dissipation problem becomes even more complicated when wire is enclosed within a tightly confined space, so fire alarms in high-rise ductwork, for example, pose additional challenges when looking for high-temperature insulated wire options.
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