Table 5. 2. Lower action limits for exposure to magnetic fields from 1 Hz to 300 GHz

Frequency range, f	Lower action value for magnetic flux density (B) [µT] (RMS)	Lower action value for magnetic flux density (B) for exposure of limbs in a restricted magnetic field [µT] (RMS)
1 Hz ≤ f < 8 Hz	2.0 x 10⁵ /f²	9.0 x 10⁵ /f
8 Hz ≤ f < 25 Hz	2.5 x 10⁴ /f	9.0 x 10⁵ /f
25 Hz ≤ f < 300 Hz	1000	9.0 x 10⁵ /f
300 Hz ≤ f < 3 kHz	3.0 x 10⁵ /f	9.0 x 10⁵ /f
3 kHz ≤ f <100 kHz	100	300
100 kHz ≤ f < 10 MHz	2.0 x 10⁶ /f	300
10 MHz ≤ f < 400 MHz	0.2	–
400 MHz ≤ f < 2 GHz	1.0 x 10^-5 f^1/2	–
2 GHz ≤ f ≤ 300 GHz	0.45	–

Note 5.2-1: f is the frequency in hertz [Hz].

Note 5.2-2: Lower action values for exposure to magnetic fields are Root-Mean-Square, RMS values corresponding to the peak values divided by √2 for sinusoidal fields. For non-sinusoidal fields, the exposure assessment shall be based on the method using weighted peak value (filtration during the period).

Note 5.2-3: The action values for exposure to magnetic fields represent the maximum calculated or measured values for the employee’s body position.