UL506, EN61558. 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'. UL recognised, ENEC05. Toroidal, Mini Open Style Transformers with Leads 115/230Vac, 60000 Series. High quality open style toroidal transformers with a 0-115/230Va.c. 50/60Hz primary winding. Twin secondary windings may be connected in series or parallel or used independently. Designed for easy mounting with centre hole fixing. Dual standard tapped primary 115/230Vac Low profile-small size-lightweight Potted centre with M4 fixing hole Low level of radiated magnetic field Very low induced noise (hum) Double insulated primary leads 100% electrical and flash tested High quality manufacturing and testing in accordance to EN61558,EN60950,EN60065, VDE0551,VDE0550,BS415