Field sources

High field strengths are known to arise in the following examples of industrial applications:

Hand holding a measuring device

Zoom Image

Measurement of the magnetic flux density on a plate demagnetizer
Source: IFA

  • Inductive heating/melting/welding
  • Demagnetizing installations
  • Electric resistance welding
  • High-frequency welding, high-frequency drying
  • Live work on transmission antennae
  • Work on high-power transmitters
  • Radar installations
  • Heavy-current applications

Measuring device in front of a machine

Zoom Image

Measurement of the electromagnetic fields on a spot-welding machine. In this area, too, high magnetic flux densities are typically generated, thereby necessitating evaluation of the exposure
Source: IFA

They should be examined more closely during a risk assessment. Conversely, estimation of the field emissions based upon manufacturers' information or site certifications is sufficient for some installations and applications. Examples include:

  • Base stations of local radio networks (WLAN)
  • Wireless telephone (DECT) and Bluetooth installations
  • Mobile telephone transmission installations on which work is not performed directly

The DGUV Report on indoor workplaces provides an overview of exposure to electromagnetic fields at indoor workplaces and the field sources typically encountered there. It contains tables of field emission values that may be useful during assessments of the relevance of the field sources.


Ingo Bömmels

Accident Prevention: Digitalisation - Technologies

Tel: +4930 13001-3580
Fax: +4930 13001-38001

Carsten Alteköster

Accident Prevention: Digitalisation - Technologies

Tel: +49 30 13001-3581
Fax: +49 30 13001-38001

Dr Florian Soyka

Accident Prevention: Digitalisation - New Technologies

Tel: +49 30 13001-3583
Fax: Fax: +49 30 13001-38001