Power Frequency Fields (60 Hz)

Provisions shall be made to restrict access to locations where electric power frequency magnetic- and electric-field strengths could be hazardous to persons with cardiac pacemakers or other similar electronic medical devices (>1 G and >1000 V/m).

Overexposures are extremely unlikely because the exposure limits are so high that few people (except for utility workers) encounter such fields. The carcinogenicity of power-frequency fields is unproven, so no guidance is given concerning this issue.