What are “Standard” vs. “Enhanced” fire-resistant cables in the EN 50200 category?

European standards classify cables by the duration they maintain integrity:

Standard (PH30 / PH60): Tested to maintain the circuit for 30 or 60 minutes. Usually sufficient for general fire alarm systems in simple buildings.

Enhanced (PH120): Tested for 120 minutes of continuous operation under fire and mechanical impact. These are required for large, complex buildings where evacuation times are longer.