The research carried out in the specialized Laboratory of the National Institute for Research and Development in Mine Safety and
Explosion Protection - INSEMEX Petrosani has identified the causes of high pressure peaks occurrence in the case of large electric
motor enclosures as: the extremely large internal volume, the geometrical shape of motor enclosures and the very intricate and
complex internal arrangement of such motor enclosures, having in mind the tendency of motor manufacturers for chemical and
petrochemical industry to manufacture motors having more complex geometrical shapes.
These results proved to be very useful in assisting designers of large flameproof electric motors to improve motors design so as to
make them more reliable when testing in explosive mixtures.