Which of the following is NOT a common electrical hazard?

Strain is considered an ergonomic hazard rather than an electrical hazard. Electrical hazards typically involve risks directly related to electrical systems, equipment, and conduction.

Shock refers to the harmful consequences of electrical current passing through the body, which can lead to severe injuries or fatalities. Arc flash presents a risk of exposure to high-energy electric arcs that can cause serious burns or injuries due to heat and pressure. Fire hazards arise from incorrect wiring, overheating, or electrical faults that can ignite combustible materials. Each of these hazards has a direct relationship with electrical systems and has specific safety measures designed to mitigate risks associated with them.

In contrast, while strain can occur from lifting heavy equipment or performing repetitive motions in an electrical context, it does not specifically relate to electricity itself. This distinction makes strain the correct answer for the question concerning common electrical hazards.