Electrical yoke tester

An apparatus for isolating the source of a fault in transfer of control signals between a yoke and an electrical switch in an electrical power distribution system, the yoke having an open signal conductor for an open control signal to open the electrical switch and a close signal conductor for a close control signal to close the electrical switch, comprising:

• connector means comprising a receptacle with appropriately spaced connectors for enabling a slidable, mating fit connection to the signal conductors of the yoke without disassembly of said yoke, said connector means further comprising:
• a connector electrically connected to the open signal conductor;
• and
• a connector electrically connected to the close signal conductor;
• indicator means electrically connected to said connector means for indicating the flow of electrical current through the yoke, said indicator means comprising:
• an open indicator for indicating on passage of the open control signal through the open signal conductor that such conductor is operative and on failing to indicate such passage identifying a faulty open signal conductor;
• a close indicator for indicating on passage of the close control signal through the close signal conductor that such conductor is operative and on failing to indicate such passage identifying a faulty close signal conductor;
• said open indicator and said close indicator on both indicating passage of their respective signals isolating the faulty condition as being in the electrical switch;
• and
• housing means for containing said connector means and said indicator means.