During the day we are mostly in a state of active awareness, concentrating on something important. During this state we are less susceptible to stress as in the state of sleeping. This is also valid for the activities at our working place. Therefore, in the course of the Gabriel-Object-Consultation, higher standard values for alternating low frequency electric fields were defined for living areas as well as for working places. The building biological standard values of the IBN (see: “measurements at sleeping berth”) were enlarged for working places by a factor of 10 in comparison to sleeping berth. At sleeping berths a value of 12V/m with respect to alternating low frequency electric fields is considered as extremely striking whereas such a value is taken as weak striking with respect to working places.
In comparison: According to the WHO during night sleeping disorder may occur upon a permanent loudness of more than 30 Dezibel. During the day, however, impairments occur above loudnesses from the outside above 50dB (Berglund/Lindvall/Schwella (1999): Guidelines for Community Noise, page 47, World Health Organization).
Besides the state of active consciousness which justifies the exposure to 10 times higher alternating low frequency electric fields, the presence of electric equipment at working places such as for example personal computer and telephone, cause the emission of alternating low frequency electric fields with field strengths above those that can be reached on sleeping berth. The sound levels that can be reached at sleeping berth are significantly lower than 30 dB but such values cannot be reached and are not necessarily to be reached at open-plan offices (confer for example the institution for statutory accident insurance and prevention in the health and welfare services: safe places - working place, office and administration (2013), page 1).
[abgerufen am 08.05.2014]).
To the left you can see the actual situation as obtained in a pre-measurement of the real local alternating low frequency electric fields including possible interactions and influences by other fields. The measurements are performed with a 3D probe and also evaluated in form of diagrams. In a grid measurement comprising nine measuring points the distribution of the low frequent magnetic flux density at one point given in nano Tesla is seized for the aches x, y and z which affords only one measuring procedure. Then the data gained are transferred to a personal computer. Special software calculates from these values a space value (isotopic measuring procedure) that is afterwards presented as a coloured image.
To the left you can see the actual-state after avoidance performances and application of dejam arrangements as obtained during the post-measurements of the real local alternating low frequent electric fields including possible interactions and influences of other fields. The measurements are performed with a 3D probe.
All measurements are performed according to the following standards in a standardized way:
Measurement according to DIN EN 50413 European basic standard
Measurement according to DIN VDE 0848-1 Federal-immission-protection law
Measurement according to BGV B11 workmen´s compensation board rules
Analysis according to IBN (SBM-2008) building-biological standard value
Analysis according to GFG e.V. Gabriel standard value (working and living)
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