>Greetings, > >I am trying to locate specifications which address maximum magnetic field exposure levels in work environments. I am somewhat familiar with the OSHA guidelines on maximum permissible power density levels at RF/microwave frequencies but do not recall ever seeing requirements for 60 Hz magnetic fields (from industrial rotating machinary). I don't want to open up the great "power transmission line debate" and I fully appreciate that this is an area of current debate (no pun intended). Ideally someone could point me to an industrial safety spec that says the maximum magnetic exposure level is x gauss. > >Any help in locating pertinent specifications or interpretation of the requirements would be greatly appreciated. If someone has already been down this road and knows that this is an area that has not been defined, please let me know. > >thanks in advance for any assistance... > >Jim Nadolny >AMP Inc. > >
Jim, there are no legal requirements in the US, but there are guidelines published by the American Conference of Governmental Industrial Hygienists (ACGIH), 6500 Glenway Ave., Bldg D-7, Cincinnai OH 45211-4438. (513) 742-2020. Ask for a copy of the Threshold Limit Values. If you ask, they might just fax you the relevant pages rather than asking you to buy the whole book. The current TLV is B (in mT) = 60/f(in Hz) for freqs from 1 Hz to 300 Hz. The TLV for arms and legs is five times higher. Richard Woods Sensormatic Electronics [email protected]
