‘Superconductive’ electromagnets and solenoids, specially designed to be fully charged or discharged in less than one second and having all of the following: Note : The item above does not apply to ‘superconductive’ electromagnets or solenoids specially designed for Magnetic Resonance Imaging (MRI) medical equipment. (a) Energy delivered during the discharge exceeding 10 kJ in the first second; (b) Inner diameter of the current carrying windings of more than 250 mm; and (c) Rated for a magnetic induction of more than 8 T or ‘overall current density’ in the winding of more than 300 A/mm 2 ;