A small voltage reading across a closed set of contacts in an energized circuit suggests what?

A small voltage reading across a closed set of contacts in an energized circuit typically indicates that there could be a problem with the contacts themselves. When contacts are functioning properly, a negligible voltage drop would occur across them, and they should show very low resistance, ideally close to zero.

If a small voltage is present, it suggests that there might be pitting or degradation occurring on the surfaces of the contacts. Pitting can happen due to arcing as the contacts open and close, which can create small imperfections on contact surfaces, leading to increased resistance and, consequently, a small voltage reading even while the contacts are closed. This condition can affect the overall efficiency and performance of the circuit.

Recognizing this helps in diagnostics and maintenance, ensuring that issues with the contacts are addressed to prevent further problems in the circuit operation.