Wiring and componentsQuestion 662 of 1506

On a panel drawing, a point is marked TB2-5. What does this mean?

  1. Terminal block 2, metal bar number 5
  2. Terminal block 5, metal bar number 2
  3. Two wires of 5 mm size on a terminal block
  4. Terminal block B, 2 screws of 5 mm
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Correct answer: Terminal block 2, metal bar number 5

The TB number names the strip, and the next number names the metal bar on that strip.

Source: Lessons in Electric Circuits I: DC (Kuphaldt), 5.8: Building Simple Resistor Circuits

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Questions last reviewed: 18 October 2026