Enclosure general description

The following is a general description of NEMA electrical equipment enclosure definitions from NEMA Publication 250, Enclosures for Electrical Equipment (1000 Volts Maximum). 

General documentation This comprises a general description of the project Enclosures may be layout plans and suchUke. 

Generally these codes/models are limited in ability to incorporate all of the aspects of fire while still maintaining a simple physical description of how enclosure fires develop. This requires balancing mathematical detail against physical realism. 

There may thus arise a structural combination of two substances which remain associated not through strong attraction between them but because strong mutual binding of the molecules of one sort only makes possible the enclosure of the other. It is suggested that the general character of this type of combination should be indicated by the description clathrate compound— clathratus , enclosed or protected by cross bars of a grating. 

This description applies equally to assemblies using threads tapped in the plastic or to self-tapping screws. Screws are generally used for larger assemblies, such as enclosures for electrical apparatus, etc., and for any size assembly that must be taken apart for servicing or into which are fastened other components which may have to be removed fm servicing, etc. 

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