BISI ISI Certificate for Distribution Transformers IS 1180 (Part 1): 2014

BISI ISI Certificate for Distribution Transformers IS 1180 (Part 1): 2014

BIS for Outdoor type three-phase distribution transformers

Introduction about BIS Certification for Distribution Transformer Outdoor Type

In the dynamic landscape of the energy sector, transformers play a pivotal role in the efficient distribution of electricity. To ensure the quality, safety, and reliability of these transformers, the Bureau of Indian Standards (BIS) has established rigorous standards, such as IS 1180 (Part 1), for Outdoor Type Oil-Immersed Distribution Transformers. In this blog, we'll discuss about the importance of BIS certification for transformers, documents required, processes, benefits etc.

Understanding IS 1180 (Part 1): 2014 Outdoor type three-phase distribution transformers:

IS 1180 (Part 1) is a comprehensive set of specifications designed by the BIS to ensure the quality and performance of outdoor-type oil-immersed distribution transformers. The manufacturer of such Outdoor type three-phase distribution transformers has to comply with these requirements to confirm their safety and reliability. which are crucial parts of power distribution networks.

Key Features of IS 1180 (Part 1): 2014 Outdoor type three-phase distribution transformers

Transformer Ratings: The standard covers transformers with ratings up to and including 100 kVA and voltage levels of 11 KV. Which ensures that transformers are designed and manufactured to meet the specific requirements of outdoor applications in different power distribution cases.  

Construction Materials: IS 1180 (Part 1) provides detailed guidelines on the materials to be used in the construction of transformers, ensuring that only high-quality and durable materials are employed.

Testing Procedures: The standard outlines rigorous testing procedures that transformers must undergo to obtain BIS certification. Testing parameters include electrical, mechanical, and thermal performance assessments etc., These tests are performed by BIS-approved labs to verify that the transformers meet the quality standards as per BIS rule.

Environmental Considerations: Given the outdoor nature of these transformers, environmental factors are crucial. IS 1180 (Part 1) addresses aspects such as protection against the ingress of dust and water, corrosion resistance, and the ability to withstand climatic variations, ensuring transformers can operate seamlessly in diverse conditions.

Registration Process of BIS Certification for Outdoor Type Distribution Transformers

Step 1: Preparing Documentation Review IS 1180 (Part 1):

Thoroughly understand the requirements specified in IS 1180 (Part 1) for Outdoor Type Oil-Immersed Distribution Transformers. This includes transformer ratings, construction materials, testing procedures, and environmental considerations. 

Prepare Technical Documentation: Compile all technical documentation, including design specifications, test reports, and manufacturing process details, in accordance with the BIS guidelines.

Step 2: Application Submission Submit Application: 

Prepare and submit the application for BIS certification to the BIS Online portal. Include all required documentation along with the application form.

Pay Fees: Pay the necessary certification fees as specified by the BIS. The fees may vary based on the type and scope of certification.

Step 3: Factory Inspection Arrange Factory Inspection: 

BIS will conduct an inspection of the transformer manufacturing facility to ensure compliance with IS 1180 (Part 1) standards.  

Corrective Measures: If any non-compliance is identified during the inspection, the manufacturer must take corrective actions to address the issues.

Step 4: Testing Conduct Laboratory Tests: 

The BIS-approved Lab will conduct various tests on transformer samples to verify compliance with IS 1180 (Part 1) standards.

Submit Test Reports: Provide the test reports to the certification body as part of the certification process.  

Step 5: Certification Granting Review and Approval: 

The certification body will review all documentation, inspection reports, and test results. If the transformer meets the specified standards, the BIS certification will be granted.

Issuance of Certification: Upon successful completion of the certification process, the certification body will issue the BIS certification for the Outdoor Type Oil-Immersed Distribution Transformers.  

Step 6: Compliance Monitoring:

Periodic Audits: BIS may conduct periodic audits to ensure ongoing compliance with the standards.

Step 7: Display of Certification Mark:

Display BIS Mark: Upon receiving certification, the manufacturer should display the BIS certification mark on the transformers as per the guidelines provided by BIS.

Significance of BIS Certification

BIS certification for transformers is not just a regulatory requirement; it is a mark of quality and reliability. Here's why BIS certification is significant for transformers under IS 1180 (Part 1):

Consumer Confidence: BIS certification on transformers boosts confidence in consumers as this indicates that the transformers meet the BIS standards of quality and safety.

Compliance with Regulations: BIS certification is mandatory for transformers in India. Following these guidelines confirms that manufacturers follow the legal rules established by the BIS, enabling a regulated and safe electricity distribution system.


International Acceptance: BIS certification enhances the acceptability of Indian transformers in the global market, facilitating international trade and collaboration in the energy sector.


In the ever-evolving landscape of the energy sector, BIS Certification for IS 1180 (Part 1) Outdoor Type Oil-Immersed Distribution Transformers is a critical factor in ensuring the resilience and reliability of power distribution networks. Following these guidelines becomes mandatory for transformer producers as India's power infrastructure develops further. This promotes the expansion and long-term viability of the energy sector overall while simultaneously maintaining the quality and safety of the transformers.

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