Japan METI technical standards for electrical facilities (magnetic fields)
Japan caps the power-frequency magnetic flux density from transformers, switchgear and power lines at 200 µT in spaces people occupy — the ICNIRP 2010 reference level, in force since 1 October 2011.
Last verified 12 August 2026.
Also searched as: 電気設備に関する技術基準を定める省令, METI ordinance 52, Japan 200 µT rule
- Organization
- Ministry of Economy, Trade and Industry (経済産業省), Japan
- Edition
- Ordinance No. 52 of 1997, art. 27-2 added 31 March 2011, in force 1 October 2011
- Jurisdiction
- JP
- Frequency range
- 50 Hz – 60 Hz
- Status of values
- Legally enforceable in at least one jurisdiction
Scope
Applies to transformers, switches, similar equipment and power lines sited outside power stations, substations and demand premises, and to substations and switching stations themselves. Compliance is judged on the average flux density in the space a person would occupy near the equipment, with an exception for fields, forests and other places people rarely pass through. It is an equipment-siting rule, not an exposure limit for appliances or wiring inside a home.
Sources
- japan-meti-ordinance-52 電気設備に関する技術基準を定める省令 第27条の2 — 磁束密度の平均値を商用周波数において200 µT以下 (Ordinance on Technical Standards for Electrical Facilities, art. 27-2) — 経済産業省 (Ministry of Economy, Trade and Industry, Japan), via e-Gov 法令検索, 1997. regulation, link checked 2026-08-12.
- japan-meti-emf 電気設備から生じる電磁界 — 200 µT規制の導入 (EMF from electrical facilities: introduction of the 200 µT rule) — 経済産業省 (Ministry of Economy, Trade and Industry, Japan), 2011. government, link checked 2026-08-12.
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