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The Control of Electromagnetic Fields at Work Regulations (Northern Ireland) 2016

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Action Levels – thermal effects

Table AL3 - ALs for exposure to electromagnetic fields from 100 kHz to 300 GHz
Frequency RangeExternal electric field strength ALs (E) [Vm-1]Magnetic flux density ALs (B) [µT]Power density AL (S) [Wm–2]
100 kHz ≤ f < 1 MHz6.1 × 1022.0 × 106/f-
1 ≤ f < 10 MHz6.1 × 108/f2.0 × 106/f-
10 ≤ f < 400 MHz610.2-
400 MHz ≤ f < 2 GHz3 × 10-3 f1/21.0 × 10-5 f1/2-
2 ≤ f < 6 GHz1.4 × 1024.5 × 10-1-
6 ≤ f ≤ 300 GHz1.4 × 1024.5 × 10-150
Exposure levels not exceeding the ALs will be compliant with:

Up to 6 GHz: the health effect ELVs in Table ELV4

6 – 300 GHz: the health effect ELV in Table ELV6

The health effect ELV in Table ELV6
Notes

1.  The electric field strength and magnetic flux density ALs are root mean square values.

2.  For radiofrequency pulses, the peak power density averaged over the pulse width shall not exceed 1000 times the respective AL (S) value. For multi-frequency fields, the analysis shall be based on summation.

3.  Note 3 to Table AL1 applies in relation to the ALs for external electric field strength and magnetic flux density.

4.  The power density is the maximum level averaged over any 20cm2 of exposed area. Spatial maximum power densities averaged over 1cm2 shall not exceed 20 times the value of 50 Wm-2.

5.  From 6 to 10 GHz, power density shall be averaged over a six minute period. Above 10 GHz, it shall be averaged over a 68/f1.05-minute period (where “f” is the frequency in GHz).

Table AL4 – AL for exposure to electromagnetic fields from 10 to 110MHz
Frequency rangeLimb current AL (IL) [mA]
10 ≤ f ≤ 110 MHz100
Exposure levels not exceeding the ALs will be compliant with:The health effect ELV in Table ELV4 - localised SAR in the limbs
Note

   The AL is a root mean square value.

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