Features UL Listed UL Fire Rated UL Rated for 50 volts AC/DC at 3.5 amp continuous and 16 amp pulse (maximum pulse width: 400msec with 10sec minimum off time between pulses) 4 wires per hinge. Other wire configurations are available by special order. Contact us for more info. Important Information When installing an electric hinge, it must be placed as the middle hinge only. All electrified hinges have fixed pins. The hinge pin is not removable. A mortar guard is required for all applications which have a grout-filled door frame. This may be special ordered if necessary. Failure to install a mortar guard for this application will void any warranty on these hinges. These hinges are sold by the each. You would normally order one electrified hinge and two (or more) non-electrified hinges per door.