A  magnetic field surrounds the magnet in all directions. This field (known as the  stray field) is invisible and supervisors should have posted warning signs at appropriate locations. Objects made of ferromagnetic materials, e.g. iron, steel etc. will be attracted to the magnet. If a ferromagnetic object is brought too close, it may suddenly be drawn into the magnet with surprising force. This may damage the magnet, or cause personal injury to anyone in the way!

It is important that people working in the vicinity of the magnet fully understand the potential hazards. Of critical importance is that people fitted with  cardiac pacemakers or  metallic implants should never be allowed near the magnet.

Because the strength of the stray field drops significantly as one moves away from the magnet, it is important to discuss worksite safety around magnets with your supervisor.