Having a power handling capacity not exceeding 1 kVA

Electrical transformers of power handling capacity up to 1 kVA

BIS QCO APPLICABLE · ISI MARK SCHEME · IS 1180 · BEE OVERLAY

HSN 8504 31 00 (electrical transformers with power handling capacity not exceeding 1 kVA) is covered by a Bureau of Indian Standards Quality Control Order. Conformity to IS 1180 (Part 1) is mandatory under the ISI Mark Scheme with effect from 7 May 2015, by virtue of the Electrical Transformers (Quality Control) Order, 2015. Bureau of Energy Efficiency labelling compliance applies as a separate customs-clearance overlay.

What this is

HSN code

8504 31 00

Chapter

85 · Electrical machinery and equipment and parts thereof

BIS QCO

Applicable · ISI Mark Scheme · CM/L required

Indian Standard

IS 1180 (Part 1) · effective 07-05-2015

Applicable Partner Government Agencies

BEEBEE·Bureau of Energy Efficiency

BISBIS·Bureau of Indian Standards

Compliance steps

1
Source only from a Bureau of Indian Standards CM/L-licensed manufacturer holding a current licence against IS 1180 (Part 1) for outdoor-type oil-immersed distribution transformers. Verify the supplier's CM/L number, licensed product scope, kVA rating, and manufacturing facility on the BIS online register before placing the purchase order.
Electrical Transformers (Quality Control) Order, 2015 · S.O. 1221(E) dated 07-05-2015
2
Confirm the licensed scope covers the specific transformer configuration: single-phase ratings up to 25 kVA sealed type, or three-phase ratings up to 200 kVA (sealed or non-sealed), or three-phase ratings above 200 kVA up to 2500 kVA (sealed or non-sealed). A CM/L licence not covering the consignment's configuration does not satisfy the QCO.
IS 1180 (Part 1) · Electrical Transformers (Quality Control) Order, 2015 · S.O. 1221(E) dated 07-05-2015
3
Ensure every transformer bears the ISI mark and the supplier's CM/L number in accordance with Scheme-I of Schedule-II to the BIS (Conformity Assessment) Regulations, 2018. The ISI mark must appear on the product nameplate, not on packaging alone.
Scheme-I of Schedule-II to the BIS (Conformity Assessment) Regulations, 2018 · BIS Act, 2016
4
Ensure compliance with the Bureau of Energy Efficiency (Appliance Labelling and Compliance) Regulations, 2026 if the consignment falls within the BEE labelling scope. The BEE labelling reference must accompany the consignment-level documentation at the time of customs filing.
BEE Notification 5506/BEE/S&L/AL/2025-26 dated 26-12-2025
5
Quote the supplier's BIS CM/L number on the bill of entry and verify compliance with General Note 2 to the Import Policy. Customs verifies the CM/L against the BIS register in real time; an absent, expired, or scope-mismatched licence triggers consignment detention.
Electrical Transformers (Quality Control) Order, 2015 · S.O. 1221(E) dated 07-05-2015 · General Note 2 to the Import Policy · BIS Act, 2016 · Customs Act, 1962

A word of counsel

The single most common error on this tariff line is sourcing from a CM/L-licensed supplier without verifying that the licence scope precisely covers the consignment's transformer configuration — phase count, kVA rating band, and sealed or non-sealed type. IS 1180 (Part 1) segments coverage across distinct sub-categories; a licence valid for three-phase non-sealed units does not extend to single-phase sealed units, and customs detention follows a configuration mismatch even where the CM/L number itself is valid and current on the BIS register.

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Frequently asked

Does HSN 8504 31 00 require BIS certification?

Yes. Conformity to IS 1180 (Part 1) is mandatory under the ISI Mark Scheme from 7 May 2015 by virtue of the Electrical Transformers (Quality Control) Order, 2015; import is permitted only from manufacturers holding a current BIS CM/L licence covering the specific transformer type and rating.

Is Bureau of Energy Efficiency labelling required separately from BIS QCO compliance?

Yes, where applicable. BEE labelling compliance under the Bureau of Energy Efficiency (Appliance Labelling and Compliance) Regulations, 2026 is administered by the Bureau of Energy Efficiency and is independent of the BIS ISI Mark Scheme obligation.

Does IS 1180 (Part 1) cover all transformer configurations under this tariff line?

IS 1180 (Part 1) applies to mineral-oil-immersed outdoor-type distribution transformers up to 2500 kVA, 33 kV, in specified single-phase and three-phase, sealed and non-sealed configurations. Transformers outside those rating or configuration bands must be assessed against the precise licensed scope before import.

Does a single CM/L licence cover all rating bands and configurations from one manufacturing facility?

No. The CM/L licence is scope-specific by phase, kVA rating band, and sealed or non-sealed type; transformer configurations outside the licensed scope, or produced at an unlicensed facility, are not covered and will be detained at customs.

Last verified against gazette notifications: 2026-05-18. Source: BIS / BEE / Indian Customs CUSDATA.