What hazard can occur when a cord connector on a portable tool is wet?

When a cord connector on a portable tool is wet, the primary hazard that arises is the risk of electrical shock. When moisture comes into contact with live electrical components, it can create a conductive path for electricity to travel, increasing the likelihood of a person being electrocuted. Water acts as a conductor, allowing electricity to flow where it normally wouldn't, which can result in serious injuries or even fatalities.

Electrical leakage refers to the unintended flow of electrical current from its intended conductor to a grounded source, which may indeed occur when moisture is present. However, this is not as direct a risk in the context of a wet cord connector as the immediate danger of electrical shock.

Mechanical failure generally relates to the physical components of the tool itself and does not directly relate to moisture on a cord connector. Overheating is typically a concern with high current applications, but it does not pertain specifically to a wet cord connector. Therefore, the most pertinent and pressing issue that arises from a wet cord connector is the threat of electrical shock.