{
  "id": "limits:china-public-magnetic-50hz",
  "collection": "limits",
  "slug": "china-public-power-frequency-limits",
  "name": "China public limit at 50 Hz (power frequency)",
  "summary": "100 µT magnetic flux density and 4 kV/m electric field for public exposure at 50 Hz, with 10 kV/m allowed on farmland and roads beneath overhead transmission lines.",
  "status": "verified",
  "lastVerified": "2026-08-12",
  "data": {
    "standardId": "china-gb-8702",
    "population": "general-public",
    "quantity": "magnetic-flux-density",
    "band": {
      "minHz": 25,
      "maxHz": 1200,
      "label": "0.025–1.2 kHz"
    },
    "formula": "B = 5/f µT and E = 200/f V/m (f in kHz)",
    "value": {
      "quantity": "magnetic-flux-density",
      "unit": "µT",
      "value": 100,
      "basis": "regulatory",
      "note": "GB 8702-2014 Table 1 gives B = 5/f µT and E = 200/f V/m with f in kHz, so at 50 Hz (0.05 kHz) the values are 100 µT (1000 mG) and 4000 V/m (4 kV/m). Note 4 permits 10 kV/m at 50 Hz on cultivated land, pasture, aquaculture surfaces and roads under overhead lines, with warning signage. The same figure as the EU recommendation, and half the ICNIRP 2010 level.",
      "sourceIds": [
        "china-gb-8702"
      ]
    },
    "related": [
      "limits:eu-1999-519-magnetic-50hz",
      "limits:icnirp-2010-public-magnetic-50-60"
    ]
  },
  "sources": [
    {
      "id": "china-gb-8702",
      "title": "GB 8702-2014 电磁环境控制限值 (Controlling limits for electromagnetic environment)",
      "publisher": "Ministry of Ecology and Environment of the People's Republic of China",
      "url": "https://www.mee.gov.cn/ywgz/fgbz/bz/bzwb/hxxhj/dcfsbz/201410/t20141022_290449.htm",
      "year": 2014,
      "kind": "regulation",
      "retrieved": "2026-08-12"
    }
  ],
  "links": {
    "self": "https://emfbase.com/api/limits/china-public-power-frequency-limits",
    "html": "https://emfbase.com/limits/china-public-power-frequency-limits",
    "markdown": "https://emfbase.com/limits/china-public-power-frequency-limits.md",
    "collection": "https://emfbase.com/api/limits"
  }
}