Table 5. 1. Lower action values for exposure to electric fields from 1 Hz to 300 GHz

Frequency range, f	Lower action value for electrical field strength (E) [Vm^-1] (RMS)	Lower action value for power density (S) [Wm^-2]
1 Hz ≤ f < 25 Hz	2.0 x 10⁴	- (Value not given in the Directive, but can be calculated based on E. S=E² /120π)
25 Hz ≤ f < 3 kHz	5.0 x 10⁵ /f	-
3 kHz ≤ f < 3.59 MHz	170	-
3.59 MHz ≤ f < 10 MHz	6.1 x 10⁸ /f	-
10 MHz ≤ f < 400 MHz	61	-
400 MHz ≤ f < 2 GHz	3,0 x 10^-3 f^1/2	-
2 GHz ≤ f ≤ 300 GHz	140	50

Note 5.1-1: f is the frequency in hertz [Hz].

Note 5.1-2: Lower action values for electrical field strength 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 5.1-3: The action values represent the maximum calculated or measured values for the employee’s body position.

Note 5.1-4: The power density is calculated as the mean value for an exposed area of 20 cm². The local maximum power density, calculated as the mean value for 1 cm², should not exceed 20 times 50 Wm^-2. The power density from 6 to 10 GHz is calculated as the mean value for a six-minute period. Above 10 GHz, the power density is calculated as the mean value over a 68/f^1.05 -minute-period (where f equals the frequency in GHz) to compensate for a gradual decline in penetration depth as the frequency increases.