Which of the following can cause an ARC Flash?

An arc flash is a dangerous release of energy caused by an electrical fault, and it can indeed be influenced by several environmental and operational factors. Dust, temperature extremes, and condensation can all contribute to conditions that might lead to an arc flash event.

Dust can accumulate on electrical equipment and insulators, creating a conductive path that may lead to a short circuit or failure. High temperatures can affect equipment performance, diminish insulation effectiveness, and potentially lead to overheating, which may create an environment ripe for an arc flash. Similarly, condensation adds moisture to electrical components that should be dry, leading to increased conductivity and the risk of a fault occurring.

Since each of these elements can play a role in increasing the likelihood of an arc flash happening, recognizing that all three factors contribute to the risk is crucial for safety in electrical environments. Therefore, the option that encompasses all these scenarios is the most accurate choice.