Distribution Box Heat Dissipation Standards
The National Electrical Manufacturers Association (NEMA) has developed a set of standards to ensure the consistent application performance of enclosures. 7-3, show the various performance data for these enclosures in indoor and outdoor applications. illustrates schematically the various types of power distribution equipment that an engineer will encounter during the design of a power system. Non-metallic enclosures have similar heat transfer characteristics to painted metallic enclosures, so the graph can be used directly despite the difference in material. Equipment and appliances represent significant internal heat sources in modern buildings, often comprising the largest component of cooling loads in commercial and industrial facilities. Picture a busy city intersection where traffic flows smoothly because lanes are properly sized, signs are visible, and emergency exits are clearly marked.
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