Electrical Equipment Floor Space: Selected NEC Code Requirements and New Options for the Electrical System Designer
■Adequate space is a concern for electrical installations for several reasons including:
▲Worker safety;
▲Working room; and
▲Adequate clearances for personnel working on energized equipment to escape should a problem occur.
■The National Electrical Code (NEC) addresses the minimum requirements to meet these needs.
■On the other hand, building owners are looking for ways to mini-mize the size of electrical equipment in order to accommodate more building space for productive uses, thus minimizing costs. In addition, the smaller the equipment, the easier it is to move it into the required location. Factory installation and connection of components can lead to smaller overall lineups, typically resulting in reduced installation costs.
■This paper will review some of the NEC requirements regarding required electrical space. It will discuss new product concepts serving to reduce equipment size, resulting in reduced space requirements, reduced installation time, and reduced installation costs.
●Introduction
■When designing a power distribution system, floor space is always a concern. In new buildings, space costs money. The first question from the Architect to the Electrical Engineer on new projects is almost always, "How much space is required for the electrical equipment?". In existing facilities, just finding enough space to get the job done can be a challenge. In many facilities, such as college dorms, hospitals, and office buildings, the amount of electrical loads continues to grow, but the size of the electrical rooms or closets stays the same.
■Engineers are often looking for innovative ways to provide the appropriate power distribution equipment while still meeting the NEC's requirement for safe working space in front, beside, and sometimes behind the electrical equipment. Fortunately, manu-facturers are addressing this issue in several different ways including smaller components, front-access-only equipment, and pre-wired electrical assemblies.
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Please see the document for details |
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English Chinese Chinese and English Japanese |
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December 2007 |
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IA08300001E;TBG00169 |
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373 KB |
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