2 World Trade Center
|2 World Trade Center|
200 Greenwich Street
Foster and Partners' Original Proposed Design (2006)
|Construction started||November 10, 2008|
|Architectural||1,323 ft (403 m)|
|Floor area||2,800,000 sq ft (260,000 m²)|
|Design and construction|
|Architecture firm||Adamson Associates Architects|
|Engineer||Jaros Baum & Bolles|
|Services engineer||Van Deusen & Associates|
2 World Trade Center (also known as 200 Greenwich Street) is a
When completed in 1973, 2 World Trade Center (the South Tower) became the second tallest building in the World—behind its twin,
Of the 110 stories, eight were set aside for technical services in
Initially conceived as a complex dedicated to companies and organizations directly taking part in "world trade", the South Tower, along with
Electrical service to the towers was supplied by Consolidated Edison (ConEd) at 13,800 volts. This service passed through the World Trade Center Primary Distribution Center (PDC) and sent up through the core of the building to electrical substations located on the mechanical floors. The substations stepped down the 13,800 primary voltage to 480/277 volt secondary service, and then further down to 208/120 volt general power and lighting service. The complex also was served by emergency generators located in the sub-levels of the towers and on the roof of 5 WTC.
The 110th floor of 1 World Trade Center (the North Tower) housed radio and television transmission equipment; access to the roof of 1 WTC was controlled from the WTC Operations Control Center (OCC) located in the B1 level of 2 WTC.
At 9:03 a.m. EDT on
The fires might not have been as centrally positioned, nor as intense, had traditionally heavy high-rise construction been standing in the way of the aircraft. Debris and fuel would likely have remained mostly outside the buildings or concentrated in more peripheral areas away from the building cores, which would then not have become unique failure points. In this scenario, the towers might have stood far longer, perhaps indefinitely. The fires were hot enough to weaken the columns and cause floors to sag, pulling perimeter columns inward and reducing their ability to support the mass of the building above. The South Tower collapsed at 9:59 a.m. after burning for 56 minutes in the fire caused by the impact of United Airlines Flight 175 and the explosion of its fuel.