# The Control of Electromagnetic Fields at Work Regulations (Northern Ireland) 2016, Chapter: Action Levels – non-thermal effects


Table AL1 - ALs for exposure to electromagnetic fields from 1 Hz to 10 MHz
Frequency range
External electric field strength Low ALs (E) [Vm-1]
External electric field strength High ALs (E) [Vm-1]
1 ≤ f < 25 Hz
2.0 × 104
2.0 × 104
25 ≤ f < 50 Hz
5.0 × 105/f
2.0 × 104
50 Hz ≤ f < 1.64 kHz
5.0 × 105/f
1.0 × 106/f
1.64 ≤ f < 3 kHz
5.0 × 105/f
6.1 ×102
3 kHz ≤ f ≤ 10 MHz
1.7 × 102
6.1 ×102
Exposure levels not exceeding the ALs will be compliant with:
Tables ELV2 and ELV3
Table AL2 - ALs for exposure to electromagnetic fields from 1 Hz to 10 MHz
Frequency range
Magnetic flux density Low ALs (B) [µT]
Magnetic flux density High ALs (B) [µT]
Magnetic flux density ALs for exposure of limbs to a localised magnetic field (B) [µT]
1 ≤ f < 8 Hz
2.0 × 105/f2
3.0 × 105/f
9.0 × 105/f
8 ≤ f < 25 Hz
2.5 × 104/f
3.0 × 105/f
9.0 × 105/f
25 ≤ f < 300 Hz
1.0 × 103
3.0 × 105/f
9.0 × 105/f
300 Hz ≤ f < 3 kHz
3.0 × 105/f
3.0 × 105/f
9.0 × 105/f
3 kHz ≤ f ≤ 10 MHz
1.0 × 102
1.0 × 102
3.0 × 102
Exposure levels not exceeding the ALs will be compliant with:
At and below 400 Hz: the sensory effect ELVs in Table ELV3
The health effect ELVs in Table ELV2
Above 400 Hz: the health effect ELVs in Table ELV2

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Source: https://www.legislation.gov.uk/nisr/2016/266/schedule/1/part/2/chapter/1 (the official version)
Page: https://openlegislation.uk/control-of-electromagnetic-fields-at-work-regulations-northern-ireland-2016/schedule-1/part-2/chapter-1
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.