Transformer‑Russian EAC‑Certification Full Explanation

1. Core dividing‑line (voltage limitation, most critical rule)

EAC (CU‑TR / EAEU certification) is only valid for low‑voltage transformers with AC 50‑1000 V / DC 75‑1500 V.

High‑voltage transformers with rated voltage＞1kV (6kV‑10kV‑35kV‑110kV‑220kV power transformers, instrument transformers CT/PT) CANNOT obtain EAC‑DoC or EAC‑CoC, EAC‑certificate is invalid for HV‑products, you have to apply Russia national‑level GOST‑R PCT certification separately.

Mandatory EAEU‑Technical‑Regulations for ≤1kV transformers

TR‑CU‑004‑2011: Low‑voltage equipment safety (core regulation; insulation, temperature‑rise, short‑circuit resistance, protection against electric shock)

TR‑CU‑020‑2011: Electromagnetic Compatibility‑EMC (compulsory for all transformers, including radiated interference and immunity‑test)

TR‑EAEU‑037‑2016: RoHS‑hazardous‑substance limits

TR‑EAEU‑048‑2019: Ecodesign & energy‑efficiency requirement for power‑distribution transformers for grid‑projects

For explosion‑proof / mining‑type transformers: additionally apply TR‑CU‑012‑2011 (EAC‑Ex certification)

2. Two EAC‑approval modes for low‑voltage transformers (≤1kV AC)

Mode‑1: EAC‑DoC (Declaration of Conformity, self‑declaration, Mode‑5D)

Applicable transformer types:

Small‑capacity control transformers, isolation transformers: single‑phase ≤4kVA, three‑phase ≤5kVA, non‑metering‑type, dry‑type, ordinary industrial auxiliary transformers.

Mandatory requirements:

An EAEU‑registered Authorized Representative (AR) submits documents and registers the declaration in official FGIS‑EAEU database;

Test report issued by EAEU‑recognized laboratory complying with GOST‑R‑IEC‑61558‑1 (transformer‑safety standard);

Full Russian‑language technical dossier: technical passport, design drawings, operation manual, nameplate, ISO9001‑2015 certificate, raw‑material reports;

Factory‑audit is NOT required;

Validity options: single‑batch (only for one export contract), long‑term for 1‑5 years;

Manufacturer and EAEU‑AR take full legal responsibility for customs random‑inspection.

Lead‑time: 7‑15 working‑days with moderate‑cost.

Mode‑2: EAC‑CoC (Certificate of Conformity, Mode‑1C / 3C, compulsory‑certificate issued by Rosaccreditation‑authorized bodies)

When EAC‑CoC is mandatory (cannot choose EAC‑DoC):

Power‑transformers: single‑phase ≥4kVA, three‑phase ≥6.3kVA; oil‑immersed transformer, photovoltaic‑transformer, energy‑storage‑transformer;

Metering‑purpose instrument transformers (CT/PT for electricity‑billing even for ≤1‑kV);

Explosion‑proof, mining‑purpose transformers;

Transformers installed inside complete‑transformer‑substation KTP equipment.

Hard conditions:

Samples must finish full‑set type‑testing in EAEU‑accredited labs following GOST‑R‑IEC‑61558‑1 and GOST‑R‑IEC‑61869‑2 for instrument‑transformers;

Long‑term 3‑5‑year‑certificate requires on‑site factory‑audit and annual surveillance‑audit every year;

Certificate is valid for all five EAEU‑member‑states: Russia, Kazakhstan, Kyrgyzstan, Belarus, Armenia;

Single‑batch 3C‑mode: only valid for one shipment without annual audit.

Lead‑time: 35‑90 days; higher‑cost compared with EAC‑DoC.

3. High‑Voltage Transformer＞1‑kV for Russian market (No EAC available)

Governing law: Russian Federal Law‑2425‑FZ and Government Resolution №982

You have to apply for GOST‑R PCT certification, split‑into GOST‑R‑DoC and GOST‑R‑CoC:

6‑35kV power‑transformers & HV instrument‑transformers: GOST‑R‑DoC is acceptable, submit test‑reports from Russia‑approved labs, factory‑audit is usually waived;

110‑220kV ultra‑high‑voltage transformers: GOST‑R‑CoC is mandatory, sample‑testing + on‑site factory‑audit + yearly surveillance‑audit.

Applied Russian GOST standards:

Power‑transformer: GOST‑R‑IEC‑60076‑1‑2013, GOST 11677‑85;

Instrument‑transformer CT/PT: GOST‑R‑IEC‑61869‑2‑2017, GOST‑7746‑2015;

Climate‑condition test: GOST‑15150‑69 (‑50℃ XL version for Russian‑Siberia projects);

EMC‑standard: GOST‑CISPR‑11‑2015;

Fire‑safety test for oil‑immersed transformer: GOST‑31565‑2012;

Additional compulsory requirement: Instrument‑transformers for Russian national‑grid need Rosstandart state‑metering registration, only GOST‑R‑PCT certificate cannot pass grid‑acceptance.

Important limitation: Russian GOST‑R‑PCT certificate is only accepted inside Russia, Kazakhstan and Kyrgyzstan customs will not recognize GOST‑R, you have to apply GOST‑K for Kazakhstan and GOST‑KG for Kyrgyzstan separately for HV‑transformers＞1kV.

4. Central‑Asian‑Countries certification overview for HV‑transformers＞1kV

Kazakhstan (EAEU‑member): GOST‑K (ST‑RK) certification, long‑term‑certificate requires factory‑audit, Russian GOST‑R‑reports are not‑accepted directly; instrument‑transformers need Kazakhstan state‑metering registration.

Kyrgyzstan (EAEU‑member): Short‑term one‑batch delivery can apply Uvedomleniye (exemption‑letter only for customs clearance). For national‑grid‑project you need GOST‑KG‑CoC with factory‑audit and local‑metering registration.

Uzbekistan: GOST‑UZ(Oʻz‑DSt); Russian‑GOST‑R reports are just reference‑documents; long‑term‑certificate requires local‑lab‑testing and factory‑audit plus UzNIM‑metering registration.

Azerbaijan (Non‑EAEU‑country): AZS‑CoC mandatory‑certificate for both LV and HV‑transformers, EAC‑certificate is invalid for Azerbaijan market.

5. Practical advice for your export‑project‑2026

If you only export ≤1kV low‑voltage transformers: one‑set EAC‑DoC or EAC‑CoC covers all five EAEU‑countries, no separate national‑certificate needed;

If you supply high‑voltage transformers＞1kV: apply independent‑certificates country‑by‑country: GOST‑R‑Russia + GOST‑K‑Kazakhstan + GOST‑KG‑Kyrgyzstan + GOST‑UZ‑Uzbekistan + AZS‑CoC‑Azerbaijan; these certificates are mutually‑independent;

Complete full‑set GOST‑IEC‑60076‑1 / IEC‑61869‑2 tests in Russia‑authorized labs first, Tajikistan and Azerbaijan can accept these reports and reduce repeated‑testing costs.

I can prepare English‑version document‑check‑list for EAC‑DoC, EAC‑CoC, GOST‑K and GOST‑UZ if you require.

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