# China public limit at 50 Hz (power frequency)

> 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.

- Canonical URL: https://emfbase.com/limits/china-public-power-frequency-limits
- Collection: Exposure limits
- Record id: `limits:china-public-magnetic-50hz`
- Status: verified
- Last verified: 2026-08-12
- JSON: https://emfbase.com/api/limits/china-public-power-frequency-limits

## Key values

- **Limit value:** 100 µT — Regulatory value — legally enforceable — 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. [china-gb-8702]
- **Quantity:** magnetic flux density
- **Frequency band:** 0.025–1.2 kHz
- **Population:** general public
- **Set by:** China GB 8702-2014 electromagnetic environment control limits (GB 8702-2014, effective 1 January 2015)
- **Kind:** Regulatory — legally enforceable
- **Frequency-dependent formula:** B = 5/f µT and E = 200/f V/m (f in kHz)

## Related records

- [EU 1999/519/EC public magnetic field reference level, 50 Hz](https://emfbase.com/limits/eu-public-magnetic-field-50-hz): 100 µT (1000 mG) magnetic flux density and 5 kV/m electric field strength at power frequency, the values still in force across the EU.
- [ICNIRP 2010 general public magnetic field reference level at 50/60 Hz](https://emfbase.com/limits/icnirp-public-magnetic-field-50-60-hz): 200 µT (2000 mG) for the public and 1000 µT occupational — five orders of magnitude above typical household background.

## Sources

- `china-gb-8702` Ministry of Ecology and Environment of the People's Republic of China (2014). *GB 8702-2014 电磁环境控制限值 (Controlling limits for electromagnetic environment)*. https://www.mee.gov.cn/ywgz/fgbz/bz/bzwb/hxxhj/dcfsbz/201410/t20141022_290449.htm — regulation, link checked 2026-08-12

Data licence: CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Dataset version 2026.08.1. Retrieved from EMFBase, https://emfbase.com.

This record is reference data, not medical or legal advice. Regulatory limits, scientific guidelines and precautionary values are labelled separately and answer different questions.