All Types of Transformers and Their Components or Assemblies
BIS Certification Roadmap for Transformers & Components (2024 Order)
Early: BIS Certification for Transformers
Begin compliance for all transformer types (HS Code 8504 series) well before the 1 Sept 2026 deadline.
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| Sr. No. | Parameter | Details / Action Required | Compliance Status |
|---|---|---|---|
| 1. | Governing Regulation | Mandatory BIS Certification as per QCO (Quality Control Orders) issued under the Bureau of Indian Standards Act, 2016 | Applicable |
| 2. | Effective Date | Expected upon formal notification in Gazette (monitor BIS/DPIIT announcements for transformer-specific QCO) | To be Notified |
| 3. | Applicable Law | Bureau of Indian Standards Act, 2016; Legal Metrology Act (if metering is involved) | Applicable |
| 4. | Certification Scheme | Compulsory registration under BIS Product Certification Scheme – Scheme I (ISI Mark Scheme) | Mandatory |
| 5. | Marking Requirement | ISI Mark with license number must be affixed visibly on the transformer body or nameplate | Mandatory |
| 6. | Product Scope | Includes all types of liquid and dry-type transformers (≤650 kVA to >10,000 kVA), power supply units, isolating transformers, and wind turbine transformers | Covered |
| 7. | Component Coverage | Includes parts under HS Code 850490: cores, windings, insulation components, and sub-assemblies intended for regulated transformer units | Covered |
| 8. | Applicable Standards | IS/IEC 61558 (Parts 2-4, 2-6, 2-7), IS 2026 (Parts 1, 6, 11, 16), IS 13956, IS/IEC 60076 series | Compulsory |
| 9. | Industries Affected | Power generation and transmission, wind energy, electric infrastructure, metro/rail, real estate, industrial utilities, and renewable sectors | High Relevance |
| 10. | Cross-Regulatory Impact | Impacts import clearance (Customs), State Electricity Boards’ procurement, renewable energy project approvals, and DISCOM licensing | Significant |
| 11. | Exemptions | Goods solely manufactured for export are exempt. Used/refurbished machinery and spares may require separate approval | Limited Exemptions |
| 12. | Enforcement Agency | Bureau of Indian Standards (BIS), DPIIT, and Customs Department (for imports) | Active Enforcement |
| 13. | Penalties for Violation | As per Section 29 of BIS Act, 2016: imprisonment up to 2 years and/or fine up to ₹2 lakh for misuse or non-compliance | Severe |
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Product Scope Description:
This category includes all types of transformers used for electrical energy conversion or isolation, including distribution transformers, power transformers, isolating transformers, dry-type transformers, and transformers used in toys, wind turbines, and industrial applications. It covers complete machines as well as parts, subassemblies, and components under this product there are multiple types and consisting may HS code and IS clauses.
HS Codes Covered:
850421 | Electrical transformers, static converters (for example, rectifiers) and inductors liquid dielectric transformers: having a power handling capacity not exceeding 650 kva |
850422 | Electrical transformers, static converters (for example, rectifiers) and inductors liquid dielectric transformers: having a power handling capacity exceeding 650 kva but not exceeding 10,000 kva |
850423 | Electrical transformers, static converters (for example, rectifiers) and inductors liquid dielectric transformers: – having a power handling capacity exceeding 10,000 kva: having a power handling capacity exceeding 10,000 kva but not exceeding 50,000 kva |
850431 | Electrical transformers, static converters (for example, rectifiers) and inductors other transformers: having a power handling capacity not exceeding 1 kva |
850432 | Electrical transformers, static converters (for example, rectifiers) and inductors other transformers: having a power handling capacity exceeding 1 kva but not exceeding 16 kva |
850433 | Electrical transformers, static converters (for example, rectifiers) and inductors other transformers: having a power handling capacity exceeding 16 kva but not exceeding 500 kva |
850434 | Electrical transformers, static converters (for example, rectifiers) and inductors other transformers: having a power handling capacity exceeding 500 kva |
850490 | Electrical transformers, static converters (for example, rectifiers) and inductors other inductors: -parts : of transformers |
Applicable Standard(s):
Sr. No. | Standard Code | Title / Subject |
1. | IS/IEC 61558-2-4:2009 | Safety requirements for isolating transformers and power supply units incorporating them |
2. | IS/IEC 61558-2-6:1997 | Safety isolating transformers for general use |
3. | IS/IEC 61558-2-7:2007 | Transformers and power supplies for toys |
4. | IS 2026 (Part 1):2011 (Clauses 5.6 & 10) | General requirements for Power Transformers |
5. | IS 2026 (Part 6):2017 / IEC 60076-6:2007 | Power Transformers – Reactors (Clauses 7.5–12.6) |
6. | IS 2026 (Part 16):2018 / IEC 60076-16:2011 | Transformers for Wind Turbine Applications (Clauses 5.7, 7.4.4–7.4.6) |
7. | IS 2026 (Part 11):2021 / IEC 60076-11:2018 | Dry-Type Transformers (Clauses 8, 11–13) |
8. | IS 13956:1994 (Clause 10) | Specification for Testing Transformers |
Compliance Table
Comply with the Machinery and Electrical Equipment Safety (Omnibus Technical Regulation) Order, 2024 – Legally Mandatory Under the BIS Act, 2016
Legal Compliance Overview
Under the Machinery and Equipment Safety Technical Regulation, these transformer types now fall under mandatory BIS certification requirements. Import, sale, or use of non-certified transformers is prohibited beyond the notified compliance date. BIS licensees must ensure that their products conform to applicable safety and performance standards. Violations invoke penalties under the BIS Act, 2016.
This obligation is enforceable under Sections 16, 17, and 25 of the BIS Act, 2016.
Compliance deadline: 1 September 2026
Only ISI-marked and certified sets may be sold or used in India post-deadline.
Example Machine Categories Covered
Transformer Type | Typical Use or Application |
Power transformers (liquid dielectric) | Power distribution and grid infrastructure |
Dry-type transformers | Urban areas, tunnels, high-rise buildings |
Wind turbine transformers | Renewable energy projects and offshore wind farms |
Isolating transformers | Industrial automation, control panels |
Toy transformers | Safety compliance for low-voltage toys |
Testing transformers | Laboratory and product test benches |
Modular subassemblies | Transformer coils, bushings, tap changers, etc. |
Urgency to Comply
Failure to meet the BIS certification deadline (1 September 2026) may result in:
- Import and sale bans on non-certified transformers
- Customs delays and seizure of uncertified goods
- Cancellation of licenses and prohibition from tenders
- Legal penalties: fines up to ₹2 lakh (first offence), ₹5 lakh or imprisonment for repeat offences
- Blacklisting from power and infrastructure contracts
Step-by-Step Action Plan
- Product Classification – Match product to IS standards (based on type and application)
- Technical File Preparation – Include safety, winding specs, insulation class, cooling method
- Register with BIS – Apply under Scheme X via ManakOnline
- Submit Samples – Send transformer units/components to BIS-approved labs
- Factory Audit – Arrange for inspection of production, quality controls, labeling
- ISI Mark Grant – Post approval, affix ISI mark before any import or sale
- Ongoing Compliance – Retain test logs, recalibrate equipment, renew license periodically
Industries & Stakeholders Required to Comply
- Transformer OEMs and Suppliers
- EPCs in Power Transmission and Distribution
- Wind Farm and Renewable Energy Developers
- Smart Grid Contractors
- Heavy Engineering Contractors
- Importers and Exporters of Electrical Components
- Defence & Railway Electrical Equipment Vendors
Consequences of Non-Compliance
- Ban on manufacture, import, or marketing
- BIS seizure of uncertified transformers
- License cancellation and blacklisting
- Financial penalties and potential imprisonment
- Import/export shutdown due to customs detentions
- Loss of public contracts or infrastructure projects
Steps to Legalize Your Machinery
- Identify applicable IS standards and match to HS codes
- Prepare technical documentation (wiring diagrams, design specs, load profiles)
- Register with BIS under Scheme X
- Send product samples to recognized labs for testing
- Undergo factory audit for compliance validation
- Affix ISI Mark after license approval
- Maintain continuous records and periodic renewals
Conclusion: Why Action is Urgent?
Given the extensive nature of this QCO and the inclusion of all types and sizes of transformers and components, immediate action is necessary. The scope spans from low-voltage isolators to high-capacity wind turbine transformers. Compliance ensures uninterrupted supply, prevents legal risks, and secures eligibility for government infrastructure tenders. BIS licensing and testing take time—proactive initiation is critical to avoid disruptions beyond September 2026.
Act now. Enforcement is certain and time-bound.
Ready to start your certification journey?
Let us help you navigate regulatory challenges and achieve certification with ease. Leave us your details, and we’ll get back to you—or request a free consultation today.