Dimension: 0.25-5mm
Standard: IEC, NEMA, GB, JIS
UL number:E345303
Thermal class(℃): 180
The electrical resistance of an enamelled round copper wire overcoated with polyamide, specifically polyester or polyesterimide enamelled wire with a polyamide overcoat (Class 180), depends on various factors such as the wire gauge (thickness), length, temperature, and the specific resistivity of the materials used.
Polyester and polyesterimide enamelled wires are commonly used as electrical conductors due to their excellent electrical properties and thermal stability. The polyamide overcoat provides additional protection and insulation.
To calculate the electrical resistance of the wire, you can use the following formula:
Resistance (R) = (ρ × L) / A
Where:
The resistivity (ρ) of copper is approximately 1.68 × 10⁻⁸ Ω·m at room temperature.
Class 180 indicates the thermal class rating of the wire, meaning it is designed to withstand temperatures up to 180°C. However, the actual electrical resistance varies with temperature because of the temperature coefficient of resistance (TCR) of copper.
The elongation of the wire depends on factors such as conductor diameter, material properties, and the manufacturing process. For enamelled wires, elongation is generally a secondary characteristic, as electrical insulation performance is the primary design consideration.
Springiness, also referred to as elasticity or resilience, describes the wire's ability to recover its original shape after bending or stretching.
It is influenced by the wire size, conductor material, and production process. For magnet wire, electrical insulation performance is generally more critical than mechanical elasticity.
See Clause 8 of IEC 60317-0-1, where the constant K = 110 mm is used for calculating the number of revolutions required for the peel test.
The minimum heat shock temperature shall be 200°C.
No failure shall occur within 2 minutes at 265°C.
The abrasion resistance can vary depending on the thickness and quality of the polyamide overcoat, as well as the specific manufacturing processes employed.
Nominal conductor diameters range from 0.25 mm up to and including 2.50 mm.
