ANALYSIS Cause and Origin Explosion and Fire Growth Smoke Movement Smoke Characteristics Performance of Primary Electrical Systems Performance of Emergency Electrical Systems Performance of Fire Protection Systems Code Analysis Post-Incident Fire Protection at the World Trade Center 36 36 36 38 42 44 46 47 49 51 V.. Primary Electrical System2 Consolidated Edison provides 13.8KV electricity to all of the World Trade Center buildings except for the Vista Hotel through a ground level substation located near the Barclay Street (north) entrance/exit to the underground parking garage.3 Prior to the fire, the peak load provided by the substation servicing the complex was 84 megawatts for all buildings (except the Vista Hotel), the Concourse level, all basement levels and the refrigeration plant.. At 12:24 p.m., he transmitted a 10-76 signal, which indicates a fire in a high-rise building.6 Upon learning that smoke was also entering the Vista Hotel, he transmitted a second alarm at 12:27 p.m. This officer also received information indicating that smoke was entering Tower 1, so he called for a third alarm at 12:30 p.m. The first division deputy chief responded to the 10-75 call and arrived on the scene at 12:36 p.m. Upon his arrival, he was notifie d by the Port Authority that an explosion disrupted all fire protection systems and power to the World Trade Center complex.. 6 10-76 Notification of a Fire in a High-Rise Building A notification signal transmitted when, in the judgment of the officer in command, conditions indicate a fire in a high-rise building requires a total response of the following units: 4 engine companies, 4 ladder companies, 4 battalion chiefs, 1 deputy chief, 1 rescue company, field communications unit, mask service unit, command post company, high-rise unit.. ANALYSIS Cause and Origin More than 100 investigators from the New York City Police Department Bomb Squad, the Federal Bureau of Investigations (FBI), the Bureau of Alcohol, Tobacco and Firearms
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