{
  "url": "https://openlegislation.uk/control-of-electromagnetic-fields-at-work-regulations-northern-ireland-2016/schedule-1/part-2/chapter-1",
  "json_url": "https://openlegislation.uk/control-of-electromagnetic-fields-at-work-regulations-northern-ireland-2016/schedule-1/part-2/chapter-1.json",
  "legislation": "nisr/2016/266",
  "legislation_title": "The Control of Electromagnetic Fields at Work Regulations (Northern Ireland) 2016",
  "legislation_url": "https://openlegislation.uk/control-of-electromagnetic-fields-at-work-regulations-northern-ireland-2016",
  "path": "schedule/1/part/2/chapter/1",
  "kind": "chapter",
  "number": null,
  "heading": "Action Levels – non-thermal effects",
  "text": "Table AL1 - ALs for exposure to electromagnetic fields from 1 Hz to 10 MHz\nFrequency range\nExternal electric field strength Low ALs (E) [Vm-1]\nExternal electric field strength High ALs (E) [Vm-1]\n1 ≤ f < 25 Hz\n2.0 × 104\n2.0 × 104\n25 ≤ f < 50 Hz\n5.0 × 105/f\n2.0 × 104\n50 Hz ≤ f < 1.64 kHz\n5.0 × 105/f\n1.0 × 106/f\n1.64 ≤ f < 3 kHz\n5.0 × 105/f\n6.1 ×102\n3 kHz ≤ f ≤ 10 MHz\n1.7 × 102\n6.1 ×102\nExposure levels not exceeding the ALs will be compliant with:\nTables ELV2 and ELV3\nTable AL2 - ALs for exposure to electromagnetic fields from 1 Hz to 10 MHz\nFrequency range\nMagnetic flux density Low ALs (B) [µT]\nMagnetic flux density High ALs (B) [µT]\nMagnetic flux density ALs for exposure of limbs to a localised magnetic field (B) [µT]\n1 ≤ f < 8 Hz\n2.0 × 105/f2\n3.0 × 105/f\n9.0 × 105/f\n8 ≤ f < 25 Hz\n2.5 × 104/f\n3.0 × 105/f\n9.0 × 105/f\n25 ≤ f < 300 Hz\n1.0 × 103\n3.0 × 105/f\n9.0 × 105/f\n300 Hz ≤ f < 3 kHz\n3.0 × 105/f\n3.0 × 105/f\n9.0 × 105/f\n3 kHz ≤ f ≤ 10 MHz\n1.0 × 102\n1.0 × 102\n3.0 × 102\nExposure levels not exceeding the ALs will be compliant with:\nAt and below 400 Hz: the sensory effect ELVs in Table ELV3\nThe health effect ELVs in Table ELV2\nAbove 400 Hz: the health effect ELVs in Table ELV2",
  "extent": null,
  "status": null,
  "version": "current",
  "annotations": [],
  "outstanding_effects": [],
  "provenance": {
    "source": "legislation.gov.uk",
    "source_url": "https://www.legislation.gov.uk/nisr/2016/266/schedule/1/part/2/chapter/1",
    "retrieved_at": "2026-10-29T00:55:49.544396+00:00"
  },
  "licence": "Open Government Licence v3.0",
  "licence_url": "https://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/",
  "attribution": "Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives."
}