Electromagnetic Fields (EMF)

All electrical circuits produce electromagnetic fields. These fields radiate out from the source, reducing in strength with distance. Building materials such as concrete and brick do nothing to stop them. Common sources of EMF in buildings are transformers, switchboards, mains cables, motors and appliances. A sub-station transformer may radiate significant fields over a distance of several metres, whereas fields from mobile phone re-chargers or from refrigerator motors don't reach even a metre.

Electromagnetic fields are classified according to their frequency, which is the frequency of the source. Electrical power in Australia is generated at 50 cycles per second (50 Hz).

For information on the effect of electromagnetic fields on health, you are referred to Links from this site. We accept no responsibility for the accuracy or relevance of material found as a result of these Links.

One effect of EMF's which is indisputable is on computer screens. Electromagnetic interference (EMI) causes CRT computer screens to shimmer and this in turn causes operator stress and headaches. Some monitors are sensitive to as little as 10 milliGauss, where as others may be unaffected by 20 milli Gauss.

Office design must take into account electromagnetic fields and interference. It is recommended that field strengths be limited to 10 to 15 milliGauss at desk height. EMF levels can be accentuated by incorrect electrical wiring or by phase loadings being out of balance. Therefore, it is important to have an electrical analysis done and take any corrective action. Where EMI levels still remain excessive, EMF shielding between the source and the office is required.

For further assistance:

Please contact Brookes EMS on (03) 9876 2496 or email Ken Brookes for advice on your EMF / EMI circumstance.

Basement substations can emit EMF's which can pass through the concrete ceiling to the offices above.