Low Frequency Electromagnetic Shields

A Primer On ELF Magnetic Fields (click here to read article)

PowerCET Canada - Better Technologies has designed and installed many Low Frequency Magnetic Shields. The shields have been installed in several different types of environments including data centers, utility vaults, and general office spaces, to name a few. Our shields have ranged in size from a hundred square feet to over 8000 square feet. Using a combination of proprietary materials, attenuation ratios of up to 100:1 have been achieved.

See a sample ELF EMI Contour plot

We can provide detailed design drawings and specifications for incorporation into your contract documents or provide you with a complete turnkey supply and installation service (including refit). We normally have materials in stock at our fabrication facility located in Ottawa, Canada. All custom cutting and bending is performed at this facility.

Read our EMF article as it appeared in "Electrical Contractor" magazine.

Please contact us directly to discuss your shielding requirements.

Here are a few example of shields that we have constructed over the past ten years.

Shielding services are usually provided as a turnkey service, in order to solve your problem quickly and with minimal interruption to your operations.

All images and photographs on this page are copyright and cannot be used or reproduced without the written consent of PowerCET Canada.

Last updated February 05, 2008

Classifying Magnetic Fields

Magnetic fields are classified by their frequency, and as such, are measured in hertz. This defines the number of times a waveform is cycling per second. Therefore, a waveform cycling sixty times per second is said to have a frequency of 60 hertz. Power line frequency in North America is 60 Hz.

Extremely Low Frequency (ELF) range is 20 - 2,000 Hz

Very Low Frequency (VLF) range is 2,000 - 400,000 Hz

Our EMI Services Include:

Electromagnetic Field Exposure Health Assessments

Safety Code 6 Compliance Studies

Power Line Frequency Electromagnetic Field Studies

"Low EMI" Facilities Planning Studies and Design Reviews

EMI Site Preparation Testing and Assessment for CT's, MS's, and NMR devices

CRT Distortion Studies

EMI Dosimeter Trend Analysis

Equipment Exposure Assessment and Dosimeter Testing

Full Spectrum Analysis (DC to Ghz)

EMI Power Line Frequency Analysis (60hz)