Under no circumstances should both ends of the fixing bolt simultaneously contact the metal chassis or framework as this would create a potentially dangerous 'shorted-turn'. UL506, EN61558. Mounting hardware is not supplied, available seperately. Toroidal open wound low voltage lighting transformer. Single primary230 Vac 50 / 60 Hz winding with integral thermal switch Thermal switch, rated at 120° ±5°C for 50 and 105VA, 125° ±5°C for 150 and 200VA Double insulated primary leads