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[TCML] magnetic fields from TC vis a vis safety

Looked over some old notes..

A 20kW coil running into a 1 meter diameter primary produces the highest RMS field at the center of the primary of about 6-7 A/m.

Sure, the peak field is much higher, but the duty cycle is low, and for safety purposes, one gets to average, so RMS is more appropriate.

The Action Level for the general public at 150kHz is 108 A/m. Since the field at the center of the coil is as high as it gets, even a big coil doesn't get close to the limit for H field.
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