What signs indicate that electrical contacts are bad?

Pitted or burned electrical contacts are a clear indication of failure in electrical performance. These types of damage occur due to arcing, which is the result of excessive current flow through the contacts during their operation or when they are engaging and disengaging. As electrical contacts wear out, they can develop small craters or pits on their surfaces, which significantly affects their ability to conduct electricity efficiently. Burn marks may also indicate that the contacts have sustained high temperatures due to resistance, leading to degradation of the material and potential failure. Recognizing these signs is crucial for ensuring safe and reliable operation of electrical components in equipment like overhead cranes.

While other indicators such as damaged insulation, corrosion, and loose connections should also be monitored, pitted or burned contacts are a specific sign of compromised electrical integrity that directly impacts performance and safety.