Japan power-frequency magnetic limit for electrical facilities
200 µT (2000 mG) at commercial frequency in the space a person would occupy near transformers, switchgear and power lines, binding since 1 October 2011.
Regulatorygeneral publiccommercial frequency (50/60 Hz)
Last verified 12 August 2026.
- Limit value
- 200 µTRegulatory value — legally enforceable — Ordinance art. 27-2 requires the average flux density in the space equivalent to that occupied by a person to stay at or below 200 µT. Japan adopted this figure from the ICNIRP 2010 revision, which raised the public reference level from 100 µT at 50 Hz and 83 µT at 60 Hz to 200 µT at both.sources: japan-meti-ordinance-52, japan-meti-emf
- Quantity
- magnetic flux density
- Frequency band
- commercial frequency (50/60 Hz)
- Population
- general public
- Set by
- Japan METI technical standards for electrical facilities (magnetic fields) (Ordinance No. 52 of 1997, art. 27-2 added 31 March 2011, in force 1 October 2011)
- Kind
- Regulatory — legally enforceable
Related records
- ICNIRP 2010 general public magnetic field reference level at 50/60 Hz
200 µT (2000 mG) for the public and 1000 µT occupational — five orders of magnitude above typical household background.
Exposure limits
- Swiss installation limit value for power lines
1 µT (10 mG) magnetic flux density at places of sensitive use — the strictest power-frequency installation value in force in Europe.
Exposure limits
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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