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Paper Covered Wire

NOMEX Paper Covered Wire

NOMEX Paper Covered Wire is a high-performance winding wire featuring an insulating layer of NOMEX aromatic polyamide paper, designed for transformer and reactor applications requiring exceptional thermal stability, dielectric strength, and fire resistance.

Copper / AluminumConductor

Round / RectangularProfile

NOMEX PaperInsulation

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Product Overview

Conductor

Made from high-quality oxygen-free copper or electrical-grade aluminum, offering high electrical conductivity after annealing.

Winding Requirements

Available in various conductor sizes and paper wrapping methods, including butt wrapping, overlap wrapping, and interlocking wrapping, to meet different transformer winding requirements.

Insulation

Uses NOMEX Paper to provide electrical insulation and improved thermal endurance for transformer windings.

Technical Specifications

Paper covered wire – Conductor Dimensions

Parameter	Range
Rectangular Conductor Thickness (a)	0.80 – 12.00 mm
Rectangular Conductor Width (b)	3.00 – 25.00 mm
Width-to-Thickness Ratio (b/a)	≤ 20
Maximum Cross-Sectional Area	200 mm²
Round Conductor Diameter	2.00 – 5.00 mm

Enameled Paper Covered Wire – Conductor Dimensions

Parameter	Range
Rectangular Conductor Thickness (a)	1.00 – 3.00 mm
Rectangular Conductor Width (b)	5.00 – 18.00 mm
Round Conductor Diameter	2.00 – 5.00 mm

Paper Wrapping Methods

Wrapping Method	Specification
Butt Wrapping	Gap ≤ 0.5 mm
Overlap Wrapping	Overlap width 2 – 4 mm
Interlocking Wrapping	50% mutual interlocking

Values shown are typical ranges — exact parameters are confirme.

Material Description

Conductor Materials

① Copper Conductor:
• Made from high-quality oxygen-free copper rods
• Oxygen content < 20 ppm
• Conductivity after annealing > 100% IACS

② Aluminum Conductor:
• Made from high-quality electrical grade aluminum rods
• Conductivity after annealing > 62% IACS

Recommended Proof Strength (Rp0.2) for Semi-Hard Copper:

Grade	Rp0.2 Range	Resistivity Requirement
C1	100 – 180 N/mm²	1/58 Ω·mm²/m (when Rp0.2 < 200 N/mm²)
C2	180 – 220 N/mm²	1/57.5 Ω·mm²/m (when Rp0.2 > 200 N/mm²)
C3	220 – 260 N/mm²

Insulation Materials

We use premium insulation materials from domestic and international suppliers. Customers may specify preferred brands, models, and specifications:

Electrical kraft paper
High-elongation fiber paper
High-density insulation paper
Aramid paper (NOMEX)
Thermally upgraded insulation paper
PET film

Key Advantages

Exceptional Thermal & Fire Resistance

NOMEX Paper Covered Wire uses aromatic polyamide insulation paper, providing excellent thermal stability and fire resistance for demanding transformer applications.
High-Conductivity Conductor Options

Available with copper conductivity exceeding 100% IACS or aluminum conductivity exceeding 62% IACS after annealing, offering flexible conductor choices.
Large Conductor Size Capability

Paper Covered Wire supports rectangular conductors up to 12.00 mm in thickness, 25.00 mm in width, and 200 mm² in cross-sectional area, suitable for large transformer windings.
Flexible Wrapping & Customization

Butt wrapping with a gap of ≤0.5 mm, overlap wrapping of 2–4 mm, and 50% interlocking are available to meet different insulation designs and application requirements.

Typical Applications

Customization & Technical Support

Share your drawings and operating equiprements so ourteam can review the right specification.

Discuss Your Requirements

Conductor dimensions

Insulation requirements

Winding and processing needs

Packaging and delivery requirements

Why Choose Yuheng

Engineering Support

Work with us to select suitable materials and specifications for your application.

Quality & Traceability

Consistent manufacturing processes with material traceability.

Manufacturing

Flexible production to support different specifications and customer requirements.

Delivery Coordination

Work with our team on production scheduling and delivery arrangements.

Frequently Asked Questions

What is NOMEX Paper Covered Wire used for?

NOMEX Paper Covered Wire is mainly used in power transformers, dry-type transformers, reactors, inductors, and fire-sensitive electrical equipment.

What conductor materials and sizes are available?

Copper and aluminum conductors are available, with rectangular sizes up to 12.00 mm in thickness, 25.00 mm in width, and 200 mm² in cross-sectional area.

What wrapping methods are available?

Available methods include butt wrapping, overlap wrapping, and interlocking wrapping, with a butt gap of ≤0.5 mm, overlap of 2–4 mm, or 50% interlocking.