/ http://www.slideshare.net/images/logo.gif / 際際滷Share feed for 際際滷shows by User: SibusisoSbuMangena https://cdn.slidesharecdn.com/profile-photo-SibusisoSbuMangena-48x48.jpg?cb=1589187299 I ensure that all electrical circuitry and auxiliary interlocking equipment operates correctly with respect to the schematic diagrams. Conformance is checked by applying the necessary AC and DC auxiliary voltages to the switchboard and checking the operation of the various relays and solenoids in a logical sequence as per the schematics diagram.