BIS Certification for Paper Covered Copper Conductors IS 7404 (Part 1): 1991

In the world of power generation and electrical transmission, Paper Covered Copper Conductors (PCC) play a vital role, especially in the winding of power and distribution transformers. These conductors are known for their excellent thermal stability, dielectric strength, and mechanical properties, which make them highly reliable for critical applications.

To ensure the safety, reliability, and performance of PCCs used across industries, the Bureau of Indian Standards (BIS) has introduced the standard IS 7404 (Part 1): 1991. BIS certification under this standard ensures that the product meets all technical and safety requirements and is approved for use in the Indian market.

What Are Paper Covered Copper Conductors?

Paper Covered Copper Conductors are copper wires (round or rectangular) that are insulated using layers of specially treated paper. The paper serves as an electrical insulator and protects the conductor from short-circuits, overheating, and breakdown in high-voltage environments.

These paper layers are often impregnated with insulating oils or resins to enhance their dielectric properties, moisture resistance, and thermal endurance. The resulting product is a conductor capable of withstanding high voltages, temperatures, and mechanical stress, making it ideal for transformer windings, reactors and chokes, oil-filled equipment, and other high-voltage electrical apparatus.

About IS 7404 (Part 1): 1991 – BIS Standard for PCC

The Indian Standard IS 7404 (Part 1): 1991 pertains specifically to paper-covered round copper conductors. It lays down the specifications, construction requirements, dimensions, and testing procedures for ensuring uniformity and safety in these conductors.

This standard is applicable to manufacturers of PCC used in electrical equipment such as:

● Oil-immersed transformers

● Instrument transformers

● Special motors and generators

Why BIS Certification Is Important for PCC

Obtaining a BIS Certification (ISI Mark) is essential for the following reasons:

● Safety Assurance: Ensures the product can withstand electrical, thermal, and mechanical stresses.

●Regulatory Compliance: Required to legally sell the product in the Indian market under the BIS Conformity Assessment Scheme.

● Industrial Credibility: Builds confidence among transformer manufacturers and power companies that the conductor meets national standards.

● Market Access: Makes participation in public tenders and government procurement possible.

● Avoid Penalties: Non-compliance can lead to rejection of shipments or cancellation of contracts.

Key Requirements as per IS 7404 (Part 1):1991

To comply with the standard and obtain BIS certification, the following parameters must be met:

●Conductor Material: The conductor must be made of either annealed or hard-drawn copper, in accordance with IS 191: 2007 (or the latest version). It should be free from impurities and must be mechanically sound.

● Insulating Paper: The insulating paper must have high dielectric strength and be properly wrapped. The paper layers should be free of tears, creases, or overlaps. Acceptable types of paper may include kraft paper, crepe paper, or other treated varieties.

●Conductor Size and Tolerance: Round conductors must conform to the diameters specified in the standard tables. The dimensional tolerances should be within the limits prescribed in IS 7404.

Testing Parameters for BIS Certification

The following tests must be conducted on samples of the paper-covered copper conductor:

● Conductor Conditioning

● Measurement of Wire Diameter

● Width and Thickness of Paper

● Conductor Resistance Test

● Overall Diameter & Increase in Diameter

● Elongation Test

Process to Obtain BIS Certification for PCC 

The certification process involves the following steps:

●Application Submission: Apply to BIS through the online portal (ManakOnline). Include product specifications, manufacturing details, and relevant test reports.

●Factory Inspection: BIS officials will inspect your manufacturing facilities, production controls, and internal testing capabilities.

●Sample Testing: Random samples of the product will be collected and tested in BIS-recognized laboratories.

● Evaluation and Grant of License: If your products comply with the required standards, BIS will grant a license permitting the use of the ISI mark on certified products.

●Post-Certification Surveillance: The BIS will conduct regular audits and sample checks to ensure ongoing compliance.

To Know The Process in Detail, Please Visit:

Under BIS Registration Products ISI and CRS

Documents Required for BIS Certification

To apply for BIS certification, manufacturers need to submit the following documents:

●  Application form

●  Manufacturing process details

●  Quality control plan

●  Test reports from BIS-approved laboratories

●  Factory layout and equipment details

●  Proof of business registration

●  Product specifications and technical details

●  Declaration of conformity to Indian standards

Additionally, manufacturers may be required to provide proof of compliance with environmental and safety regulations, depending on the specific type of product being certified.

BIS ISI Mark Certification Costing And Timeline

BIS ISI Mark Certification Costing And Timeline

Marking & Packing Guidelines

As per BIS regulations, the following information must be marked on each spool or coil of the conductor:

● Manufacturer’s name and trademark

● Type and size of conductor

● Standard reference: IS 7404 (Part 1): 1991

● Lot or batch number

● Date of manufacture

● ISI Mark, if certified

The conductors should be packed in a way that prevents damage to the insulation during transportation or storage.

Why Choose EVTL India?

At EVTL India, we specialize in guiding manufacturers through the complete BIS certification process—from documentation and sample testing to audit preparation and license acquisition. If you manufacture Paper Covered Copper Conductors, securing BIS certification is essential for legal compliance, market trust, and competitive advantage.