Phoenix Plaza

In January 2004, VitaTech installed a 2819 ft magnetic shield inside the basement level switchgear room and ground floor tenant space to reduce magnetic field emissions to 10 mG and less under normal operating conditions.

AC ELF magnetic field levels exceeded 418 mG inside the tenant space. The magnetic shield installation was completed on 21 April 2004, and a final test was conducted to verify performance. The final performance test concluded that the magnetic field levels were significantly reduced inside the tenant space to 10 mG and less measured 1 meter from the edge of the shield and 1 meter above the floor.

Figure #1 - Office #1, Floor Level
Recorded AC ELF magnetic flux density levels are shown in Hatch, Profile and 3-Dimensional plots in Figure #1. Data was recorded at floor level beginning at the northwest corner of the office and proceeding through the office space in a contour (back-and-forth) fashion as illustrated in Diagram #1A. The following is a quick description of the Hatch, Profile and 3-D contour plots presented within this report from the recorded data.

The data path was 263 ft. long with an average level of 54 mG and a 318 mG maximum peak measured near the common wall separating tenant areas. Diagram #1A shows the Hatch Plot while Diagram #1B shows the Profile Plot . Diagram #1C shows the recorded data in a 3-Dimensional Contour Plot. The picture located in Diagram #1A, illustrates the survey path taken across the office area. The high emission levels recorded are caused from the secondary 480/277 V electrical feeders

Figure #2 - Office #1, 1-Meter Level
Figure #2 shows the AC ELF magnetic flux density data following the same survey path as Figure #1 but recorded at 1-meter level with an average level of 35.6 mG and a 120 mG maximum peak. Again, the high emission levels are caused from the secondary 480/277 V electrical feeders located below. Diagram #2A shows the Hatch Plot while Diagram #2B shows the Profile Plot. Diagram #2C shows the recorded data in a 3-Dimensional Contour Plot.

Figure #3
Numerous EMF generating sources including busawys, transformer vaults, and Grounding Electrode Conductors.