code of practice of electrical safety for work on or near high voltage

Notes:(a)General Safety RequirementsCaution: People with cardiac pacemakers andother implanted <strong>electrical</strong>ly activated devices,or with ferromagnetic implants, may not beadequately protected by the limits given here.The majority <strong>of</strong> cardiac pacemakers areunlikely to be affected from exposure to fieldsbelow 0.5 milliTesla. (Static or D.C. magneticfields)People with some ferromagnetic implants or<strong>electrical</strong>ly activated devices (other thancardiac pacemakers) may be affected byfields above a few milliTesla.(b) When magnetic flux densities exceed 3milliTesla (Static or D.C. magnetic fields),precautions should be taken to preventhazards from flying metallic objects.Areas in which higher levels <strong>of</strong> exposure canoccur outside safe approach distances (seeClauses 6.1 and 6.2) shall be fenced <strong>of</strong>f toexclude access whilst <strong>electrical</strong> apparatus isenergised.Page 38 <strong>of</strong> 148 Blue Book – December 2005