In July 2007, VitaTech Engineering was contracted to install a dual-substrate AC ELF magnetic shield in a nanotechnology research center in the southeast currently under construction. The research center will feature 30,000 square feet of clean rooms critical to research and instruction in microelectronics, semi-conductors, materials, medicine, and pharmaceuticals.
The 7,330 square foot AC ELF magnetic shielding system was installed to attenuate the emissions
emanating from two switchgear units and an automatic transfer switch that could effect EMI sensitive tools in the building. The aluminum and low carbon steel plate was fabricated and installed on the floor, walls and ceiling surrounding two 4000 amp switchgears on the basement level of the building.
Shield Design layout over architectural drawings
4000 Amp ATS-43 Automatic Transfer Switch & Switchgear Sources
1500 and 2500-3500 kVA Transformer EMI Mitigation
Transformers are located outside the main building complex. Four 2500-3500 kVA transformers feed the two main 4000 amp switchgears located on the basement level main electrical switchgear room, via four underground duct banks. The duct banks transverse from the transformer vault to the switchgear room underground and outside the main building complex, with the exception of where the conduits tie into the switchgears. It was recommended that the conduits inside the concrete duct bank be composed of rigid galvanized steel (RGS), which provide the highest amount of attenuation (approximately -23 to -26 dB) and would effectively reduce EMI emissions from the conduits.
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