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Virtually all commercial buildings have areas with elevated AC (60 Hz – power frequency) magnetic fields which can cause interference problems with sensitive electronic commercial-1equipment, and may be of possible health concern when continuously occupied. These are unavoidable; they are caused by electrical distribution equipment such as transformers, distribution switchboards, distribution service panels, and distribution electrical feeders/conduits. Most commercial buildings have background fields in the range of 2-4 milliGauss, but also have areas containing “hotspots” with much higher readings near these current sources. With today’s increasingly sensitive electronic technology, even relatively low background fields may be sufficient to cause equipment interference.

Problems with AC (60 Hz – power frequency) magnetic fields frequently emerge immediately after a new tenant moves in or after a build out or renovation. Space that commercial-2was either previously unused or not used for sensitive electronic equipment operations may suddenly develop a problem. For example, a previous “low tech” tenant may not have used computers extensively, but a new high-tech tenant has sensitive data communications and processing equipment that is sensitive to interference from AC (60 Hz – power frequency) magnetic fields as low as 2 to 3 mG.

New EMI problems are also common when there is a change in the building’s power structure. Proper planning during a renovation or lease negotiation can save considerable time and money if there is a potential EMF problem.

Commercial Projects

Acces Co. – Japan

While designing a new fourteen (14) story headquarters building in Osaka, Japan, Acces Co. Ltd., a major software development company

LAM Research

FMS was engaged as the project’s EMI Consultant to site and house a Transmission Electron Microscope (TEM)

International Center of Photography – New Headquarters

The International Center of Photography (ICP) has established its new world headquarters in a 20,000 sq. ft.


Over its 20 years, FMS has successfully completed hundreds of EMI projects which included a diverse range of consulting and mitigation services.

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