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BIS ISI Certification for Oil-Immersed Distribution Transformers

calendar27 Dec, 2022
timeReading Time: 4 Minutes
BIS ISI Certification for Oil-Immersed Distribution Transformers

An oil-immersed transformer, also known as an oil-filled transformer, is a type of voltage converter device that uses oil cooling to lower the temperature of the transformer. In comparison to a dry-type transformer, an oil-immersed transformer’s body is fitted inside a welded steel oil tank that is filled with insulation oil. When an oil-immersed transformer is turned on, the heat from the coil and iron core is converted into insulating oil, which is subsequently converted into the cooling medium. Additionally, it can be subdivided into an immersed natural cooling transformer and an immersed forced air cooling transformer depending on capacity. In this blog, we will cover BIS ISI Certification for Oil Immersed Distribution Transformers.

Oil-type transformers are utilised in power distribution and electrical substations. Their coils and core are submerged in oil, which insulates and cools them. Oil is transported by convection through ducts in the coils and around the coil and core assembly.

The Bureau of Indian Standards is India’s National Standards Body, operating under the Department of Consumer Affairs, Ministry of Consumer Affairs, Food and Public Distribution, and the Government of India. It was founded as a result of the Bureau of Indian Standards Act, 2016, which came into effective on October 12, 2017.

The Indian Standards Institution (ISI) was incorporated as a Registered Society under the Societies Registration Act of 1860[1] on January 6, 1987. As India’s National Standards Body, the institution had a clear mandate to develop and promote standards for acceptance by Indian industries.

Benefits of BIS ISI Certification for Oil Immersed Distribution Transformers

With BIS ISI Mark Certificate, companies and their products simply unlock the following benefits:

  • The BIS ISI Mark Certificate enables producers to continue producing and marketing their goods throughout India.
  • BIS ISI certification enables manufacturers to use the standard mark, that is, the ISI mark on their manufactured goods included in the required BSI ISI certificate category. Manufacturing these products or items without an ISI Mark could result in a hefty fine, imprisonment or both.
  • BIS ISI Mark on any product ensures consumer’s safety and health and develops trust.
  • BIS ISI certified product ensures high quality and consumer satisfaction, which increases revenue.

Documents Required for BIS ISI Certification for Oil Immersed Distribution Transformers in India

For the BIS ISI Certification application for Oil Immersed Distribution Transformers, the documentation requirements are extremely specific and general, and they include the following:

  • Laboratory Test Reports as per Product Standard
  • A copy of factory registration documents
  • A follow chart manufacturing process
  • Details regarding the in-house testing facilities
  • A copy of government authorised ID proofs of the authorized signatory and all the other related documents.

Procedure to obtain BIS ISI certification for Oil Immersed Distribution Transformers

The BSI ISI Certification process for Oil Immersed Distribution Transformers in India is not very complex, and involves the following steps:

  • Relevant Product Code selection
  • ISI Mark Registration online application form fill up with the required documents
  • Factory audit by BIS authorized auditor
  • Sample Report submission by BIS- authorized laboratory
  • Grant of licence by BIS Authority

What is foreign manufacturers’ certification scheme? 

Foreign Manufacturers Certification Scheme is a Scheme operated by the BIS since year 2000 under Scheme-I of Schedule-II, BIS Act, 2016 & (Conformity Assessment) Regulations, 2018 for foreign manufacturers. This scheme enables the foreign applicants/manufacturers to use the standard mark, which is also known as ISI Mark, to sell their products in India.

Mandatory Documents For FMCS ISI Mark Certificate – BIS ISI Certification for Oil Immersed Distribution Transformers

As of very recently, BIS Online application system has been introduced to collect and preserve the records, making the documentation portion of the FMCS BIS Certification scheme of BIS relatively simple. The following are the mandatory documents that the applicant must have before starting the project:

  1. Registration documents of your factory/company
  2. Flow chart of your manufacturing process
  3. Details regarding manufacturing capabilities in-house and also outsourcing agreement of manufacturing operation, if applicable.
  4. Adequate facilities for testing
  5. Quality Control Parameters & their records
  6. Accept Scheme of Testing & Inspection & Annual Marking fee, laboratory product testing report & other information as per BIS norm & so on. The list of documents is quite tedious & can be obtained from BIS.

What is the process for FMCS BIS ISI certification for Oil Immersed Distribution Transformers?

Following is the process for BIS ISI Certification (Foreign Manufacturer) for Oil Immersed Distribution Transformers:

  • Submit your application with all the vital documents.
  • BIS authorises will verify all the documents filled with your application.
  • In case, any document/test equipment or any other requirement is missing or incomplete, authorities will send a mail to the applicant. Application must provide all necessary documentation to satisfy the authorities.
  • An acknowledgement number will be issued for the future purpose.
  • BIS officer will visit your factory premises.
  • BIS Officer will examine the manufacturing process, testing infrastructure & also test the product in your in-house lab.
  • BIS Officer will collect the product sample, seal it & forward it for testing with an independent laboratory.
  • The sample collected will be sent to BIS approve laboratory.
  • (Note: All the charges for testing will be paid by the application firm.)
  • After receving the test reports, applicant will be asked to pay a licence fee, advance minimum marking fee and all the outstanding dues, if any.
  • Finally the letter for grant of licence will be issued.

Guidelines for AIR

Every foreign manufacturer/applicant must have a branch office in India that, on their behalf, would perform all responsibilities and obligations related to the BIS Act of 1986 and the rules and regulations created for the purpose of registration. For the purpose of presenting their case and complying with the legislation and registration requirements, foreign manufacturers and companies must appoint an authorised representative in India.

The applicant should watch out for the following things when appointing the AIR:

  1. AIR nominated by the foreign manufacturer or applicant should be an Indian resident.
  2. AIR shall give his consent that he or she is responsible for compliance to the provisions of the BIS Act, Rules & Regulations, and terms & conditions given in BIS Licence, agreement, undertaking/other documents executed on behalf of the foreign manufacturer or applicant  in connection with grant & operation of the licence.
  3. AIR can only represent one foreign manufacturer or applicant at one time.
  4. AIR(s) shall have zero conflict of interest in their role as Authorised Indian Representative with testing of a sample(s) in 3rd party laboratories.
  5. The minimum qualification for an Authorised Indian Representative is a bachelor’s degree & knowledge of the provisions of the BIS Act, 2016, as well as rules & regulations.
  6. The name of the AIR should appear in the licence documents.


Did you know that the BIS ISI Mark Certificate is required in India for over 150 products? Although obtaining a BIS licence is optional, the BIS made obtaining the certificate necessary for some products in order to protect customers from fake and counterfeit goods. A BIS ISI Certification must be obtained by all makers, importers, and foreign entities if your product is subject to the BIS Conformity Assessment Scheme. If the product doesn’t adhere to certification requirements, the Bureau has the right to revoke the licence.

Read Our Article: BEE Registration For Distribution Transformers: Explained

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