• Horizontal: for maximum deflection over the cable
  
• Vertical: for a null over the cable
  
• 45° angle: for a null at a horizontal distance from the cable that is equivalent to the cable depth
  

The Biddle Phase Sequence/Continuity Indicator provides positive identification of phase sequence of energized lines and indicates which phase, if any, is faulty.

Test Procedure Continuity: Connect red, yellow and blue leads to the phases A, B and C, respectively. If continuity is complete, the three top neon tubes will light. If continuity is not complete, only the faulty phase will light.

Phase Rotation Sequence: After continuity test indication is proven without a faulty phase, either of the two bottom neon tubes will light, indicating correct A-B-C rotation or incorrect A-C-B rotation. If necessary, reconnect to obtain A-B-C rotation.