✓ ISO 9001:2015 Certified

Enamelled Copper Wire

 

BMI manufactures enamelled copper wire from electrolytic tough pitch (ETP) copper across all standard thermal grades. 8 SWG to 42 SWG. Uniform enamel build, tight conductor tolerance, and a batch material test report with every single order — direct from our ISO-certified plant in Bhiwadi, Rajasthan.

 
Enamelled Copper Wire
Product Overview

What Is Enamelled Copper Wire — And Why Conductor Quality Defines Winding Performance

Enamelled copper wire is an electrolytic tough pitch (ETP) copper conductor coated with a continuous, pinhole-free polymer enamel insulation. The enamel film — typically polyester, polyesterimide, or polyamide-imide — electrically isolates each conductor turn in a closely wound coil, enabling high turn counts in a compact winding window without conductor-to-conductor short circuits.

Also called copper magnet wire or copper winding wire, enamelled copper wire is the primary conductor in every AC induction motor, DC motor, power transformer, generator, solenoid, and electromagnetic coil. The thermal class — Class B (130°C), Class F (155°C), Class H (180°C), or Class C (220°C+) — determines the maximum continuous operating temperature of the winding insulation and, therefore, the permissible temperature rise of the motor or transformer under load.

At BMI Cables, we manufacture enamelled copper wire from 99.9% purity ETP copper at our ISO 9001:2015 certified facility in Bhiwadi, Rajasthan. Conductor drawing, enamelling, and spool winding are all performed in-house — with continuous spark testing during enamelling and a batch-specific material test report (MTR) supplied with every order.

 

ETP Copper — Maximum Conductivity

Electrolytic tough pitch copper with minimum 99.9% purity delivers the highest electrical conductivity — critical for minimising resistive losses in motor and transformer windings.

Pinhole-Free Enamel Insulation

Continuous in-line spark testing during enamelling detects and eliminates enamel pinholes before they reach the spool — preventing turn-to-turn short circuits in service.

Tight Dimensional Tolerance

Conductor and overall enamelled diameter held to IS 13730 limits throughout production — critical for accurate turn counts and reliable automatic winding machine performance.

Certified Thermal Class per Grade

Each thermal class is a distinct manufacturing grade using the specific enamel chemistry for that standard — not relabelled stock. Confirmed by batch MTR.

Wire Grades

Our Enamelled Copper Wire Range — Four Thermal Grades, One Certified Source

BMI manufactures enamelled copper wire across all standard thermal classes. Each grade uses the specific enamel chemistry for that IS 13730 / IEC 60317 sub-standard — not a generic insulation applied across multiple grades.

 
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Key Features

What Makes BMI Enamelled Copper Wire Different

Every performance parameter that matters to a motor OEM or transformer manufacturer — built into the manufacturing process, not just stated on a datasheet.


High Electrical Conductivity

99.9% purity ETP copper ensures minimum resistivity — reducing I²R losses in motor windings and contributing to higher efficiency ratings in the finished product.

Continuous In-Line Spark Testing

Every metre of enamelled copper wire is spark-tested during the enamelling process. Enamel pinholes are detected and eliminated before spooling — not discovered at warranty claims.

Tight Diameter Tolerance to IS 13730

Conductor and overall enamelled diameter controlled within IS 13730 tolerance bands throughout production — preventing winding machine breakages and ensuring accurate coil turn counts.

Thermal Class Integrity per Grade

Each thermal class uses the correct enamel chemistry — polyester for Class B, polyesterimide for Class F, PAI overcoat for Class H. Confirmed by batch test report. No substitutions.

Smooth Automatic Winding Performance

Lubricant-coated enamel surface ensures consistent, low-friction spool unwind on automatic coil winding machines — minimising wire breaks and winding machine downtime.

Verified Dielectric Strength per Batch

Enamel film voltage withstand tested to IS 13730 / IEC 60317 requirements for the applicable SWG and build grade — verified and documented per batch, not sampled annually.