How much does copper expand when vaporized in an Arc Flash?

When copper undergoes vaporization in an arc flash, it expands significantly due to the transition from a solid state to a gaseous state. This expansion occurs because the molecules in the solid copper, which are closely packed, can disperse and move freely once vaporized, leading to a dramatic increase in volume.

The expansion ratio of approximately 67,000 times is a recognized figure in the field of electrical safety and hazard analysis. It highlights the sheer potential for explosion and force generated during an arc flash event. Understanding this expansion factor is crucial for safety precautions, as it underscores the risk associated with high-energy electrical faults and the necessity for proper protective measures and equipment in electrical work.

This value helps technicians and engineers assess the expected impact and damage that could occur during an electrical incident, allowing for better planning and risk mitigation in environments where electrical systems are present. The very high expansion factor serves as a reminder of the volatility of electrical systems and the importance of respecting safety protocols.