{
  "id": "limits:japan-power-frequency-magnetic",
  "collection": "limits",
  "slug": "japan-power-frequency-magnetic-limit",
  "name": "Japan power-frequency magnetic limit for electrical facilities",
  "summary": "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.",
  "status": "verified",
  "lastVerified": "2026-08-12",
  "data": {
    "standardId": "japan-meti-facilities",
    "population": "general-public",
    "quantity": "magnetic-flux-density",
    "band": {
      "minHz": 50,
      "maxHz": 60,
      "label": "commercial frequency (50/60 Hz)"
    },
    "value": {
      "quantity": "magnetic-flux-density",
      "unit": "µT",
      "value": 200,
      "basis": "regulatory",
      "note": "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.",
      "sourceIds": [
        "japan-meti-ordinance-52",
        "japan-meti-emf"
      ]
    },
    "related": [
      "limits:icnirp-2010-public-magnetic-50-60",
      "limits:ch-onir-power-lines"
    ]
  },
  "sources": [
    {
      "id": "japan-meti-ordinance-52",
      "title": "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)",
      "publisher": "経済産業省 (Ministry of Economy, Trade and Industry, Japan), via e-Gov 法令検索",
      "url": "https://laws.e-gov.go.jp/law/409M50000400052",
      "year": 1997,
      "kind": "regulation",
      "retrieved": "2026-08-12"
    },
    {
      "id": "japan-meti-emf",
      "title": "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)",
      "publisher": "経済産業省 (Ministry of Economy, Trade and Industry, Japan)",
      "url": "https://www.meti.go.jp/policy/safety_security/industrial_safety/sangyo/electric/detail/setsubi_denjikai.html",
      "year": 2011,
      "kind": "government",
      "retrieved": "2026-08-12"
    }
  ],
  "links": {
    "self": "https://emfbase.com/api/limits/japan-power-frequency-magnetic-limit",
    "html": "https://emfbase.com/limits/japan-power-frequency-magnetic-limit",
    "markdown": "https://emfbase.com/limits/japan-power-frequency-magnetic-limit.md",
    "collection": "https://emfbase.com/api/limits"
  }
}