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.