Division B ACTION LEVELS (ALs)
United Kingdom
The following physical quantities and values are used to specify the action levels (ALs), the magnitude of which are established to ensure by simplified assessment the compliance with the relevant ELVs or at which relevant protection or prevention measures specified in Article 5 must be taken:
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ALs(E) for electric field strength E of time varying electric field, as specified in Table B1;
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ALs(B) for magnetic flux density B of time varying magnetic field, as specified in Table B1;
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ALs(S) for power density of electromagnetic waves, as specified in Table B1;
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ALs(IC) for contact current, as specified in Table B2;
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ALs(IL) for limb current, as specified in Table B2;
ALs correspond to calculated or measured field values at the workplace in the absence of the worker, as maximum value at the position of the body or specified part of the body.
Action levels (ALs) for exposure to electric and magnetic fields
ALs(E) and ALs(B) are derived from the SAR or power density ELVs (Tables A1 and A3) based on the thresholds related to internal thermal effects caused by exposure to (external) electric and magnetic fields.
Table B1
ALs for exposure to electric and magnetic fields from 100 kHz to 300 GHz
| Frequency range | Electric field strength ALs(E) [Vm–1] (RMS) | Magnetic flux density ALs(B) [μT] (RMS) | Power density ALs(S) [Wm–2] |
|---|---|---|---|
| 100 kHz ≤ f < 1 MHz | 6,1 × 102 | 2,0 × 106/f | — |
| 1≤ f < 10 MHz | 6,1 × 108/f | 2,0 × 106/f | — |
| 10 ≤ f < 400 MHz | 61 | 0,2 | — |
| 400 MHz ≤ f < 2 GHz | 3 × 10–3 f½ | 1,0 × 10–5 f½ | — |
| 2 ≤ f < 6 GHz | 1,4 × 102 | 4,5 × 10–1 | — |
| 6 ≤ f ≤ 300 GHz | 1,4 × 102 | 4,5 × 10–1 | 50 |
Table B2
ALs for steady state contact currents and induced limb currents
| Frequency range | Steady state contact current, ALs(IC) [mA] (RMS) | Induced limb current in any limb, ALs(IL) [mA] (RMS) |
|---|---|---|
| 100 kHz ≤ f < 10 MHz | 40 | — |
| 10 ≤ f ≤ 110 MHz | 40 | 100 |