Tunnels and Subways

Fire and Performance Wiring > Tunnels and Subways

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EMERGENCY POWER SUPPLY

Emergency generators are brought into play when regular power fails, and are the backbone of the systems that provide time for a safe evacuation of occupants, and power to operate the life safety and fire fighting systems.

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FIRE PUMPS

Perhaps the most important fire fighting piece of equipment, the fire pump ensures water pressure for the sprinkler system. Mechanically tough, fire-rated wiring is needed for this critical circuit.

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PRESSURIZING FANS AND SMOKE DAMPERS

For stairwells and other areas of safe refuge, pressurization fans and smoke dampers provide a positive pressure to maintain a smoke free area of safe refuge with clean air for breathing, and visibility for egress.

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SMOKE VENTING FANS

Smoke is the major threat because of loss of visibility and air to breathe, and fans to remove smoke are of crucial importance.

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EMERGENCY LIGHTING

When normal power is disrupted in a fire, the chances of safe egress or firefighting in the dark go down dramatically. Emergency lighting provides the back-up for the normal lighting.

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The possibility of accidents and fire in subways and tunnels is very real, and a constant threat. Codes spell out minimum requirements, are not always stringent, and generally improve only after tragedies occur. Good engineering practice in these high risk environments demands that the highest level of safety practices be applied.

No cable can match the cable characteristics that make Mineral Insulated cable ideal for use in tunnels and subways. Low profile 2-hour fire rated Pyrotenax® cable is used in tunnels around the world, and has proven itself as the true survivor under actual fire conditions.

Pyrotenax MI cable systems were installed when fire broke out in the Chunnel tunnel in 1996. Enduring temperatures that destroyed the concrete, Pyrotenax MI allowed emergency lighting to operate throughout, for the safe evacuation of passengers, proving itself to be the true fire survival cable.

FIRE ALARM

The National Fire Alarm Code stipulates that in Voice Evacuation Fire Alarm systems, the wiring for the notification circuits shall be 2-hour fire rated. Fire Alarm wiring designed to meet the survivability requirement for notification circuits is required.

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