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Electronic Enclosures - Industry Standards

Metal Electronic Enclosures

Electronic enclosures can satisfy a wide range of business requirements, including hand-held, desktop and wall mounted applications. Quality enclosures are pre-engineered for a wide range of customization, including machining, molding and pad printing. This design flexibility minimizes tooling and up-front costs while allowing customers to tailor the products to their specific needs.

Some types of electronic enclosures include hinged cover, screw cover, flush mount, surface mount, single door enclosure, and screw cover trough.

Quality enclosures are finished with a polyester powdercoat of industrial grade designed to provide ordinary protection against corrosion in average stable indoor environments unless otherwise noted. Special material, such as stainless steel, and finish enclosures are available for outdoor, special and/or variable environments that would accelerate corrosion.

Electrical enclosures are typically designed and manufactured to be mounted permanently and should not be subject to dynamic impacts or loading. The enclosures and assembled equipment must be securely mounted to structures that will completely support the weight and sustain all other forces which may be imposed. Complete vertical support and additional lateral support must be provided these enclosures during storage, assembly and transit. Special equipment for stabilizing and supporting is available.

Before energizing any circuits, check all internal and external electrical and mechanical clearances to assure all equipment mounted and assembled functions properly and safely. Because of the variety of installed equipment, electrical applications and physical locations to which these enclosures may be subjected, it is impossible to anticipate or advise users about possible interferences which may occur in use of the enclosures. To assure the proper electrical and mechanical functions in each particular application, assemblers and installers must consult with equipment manufacturers and observe all regulatory agencies' procedures and safe practices.

NEMA (National Electrical Manufacturers Association), UL (Underwriters Laboratories Inc.), and IEC (International Electrotechnical Commission) are standard rating organizations commonly recognized in North America. Their ratings are based on similar application descriptions and expected performance. UL requires enclosure testing by qualified evaluators. They also send site inspectors to make sure a manufacturer adheres to manufacturing methods and material specifications.

The more common types of enclosures used by the electrical industry with a brief description relating to their environmental capabilities follows:

Enclosure Rating NEMA UL 50 IEC Cross Reference (Approximate)

Type 1

Enclosures constructed for indoor use to provide a degree of protection to personnel against incidental contact with the enclosed equipment and to provide a degree of protection against falling dirt.

Indoor use primarily to provide protection againse contact with enclosed equipment and against a limited amount of falling dirt.

IP20

Type 3

Enclosures constructed for either indoor or outdoor use to provide a degree of protection against falling dirt, rain, sleet, snow, and windblown dust; undamaged by the external formation of ice on the enclosure.

Outdoor use to provide a degree of protection against windblown dust and windblown rain; undamaged by the formation of ice on the enclosure.

IP64

Type 3R

Enclosures constructed for either indoor or outdoor use to provide a degree of protection to personnel against incidental contact with the enclosed equipment; to provide a degree of protection against falling dirt, rain, sleet, and snow; and that will be undamaged by the external formation of ice on the enclosure.

Outdoor use to provide a degree of protection against falling rain; undamaged by the formation of ice on the enclosure.

IP22

Type 4

Enclosures constructed for either indoor or outdoor use to provide a degree of protection to personnel against incidental contact with the enclosed equipment; to provide a degree of protection against falling dirt, rain, sleet, snow, windblown dust, splashing water, and hose-directed water; and that will be undamaged by the external formation of ice on the enclosure.

Either indoor or outdoor use to provide a degree of protection against falling rain, splashing water, and hose directed water; undamaged by the formation of ice on the enclosure.

IP66

Type 4X

Enclosures constructed for either indoor or outdoor use to provide a degree of protection to personnel against incidental contact with the enclosed equipment; to provide a degree of protection against falling dirt, rain, sleet, snow, windblown dust, splashing water, hose-directed water, and corrosion; and that will be undamaged by the external formation of ice on the enclosure; resists corrosion.

Either indoor or outdoor use to provide a degree of protection against falling rain, splashing water, and hose directed water; undamaged by the formation of ice on the enclosure; resists corrosion.

IP66

Type 12

Enclosures constructed (without knockouts) for indoor use to provide a degree of protection to personnel against incidental contact with the enclosed equipment; to provide a degree of protection against falling dirt; against circulating dust, lint, fibers, and flyings; and against dripping and light splashing of liquids.

Indoor use to provide a degree of protection against dust, dirt, fiber flyings, dripping water, and external condensation of noncorrosive liquids.

IP55

Type 13

Enclosures constructed for indoor use to provide a degree of protection to personnel against incidental contact with the enclosed equipment; to provide a degree of protection against falling dirt; against circulating dust, lint, fibers, and flyings; and against the spraying, splashing, and seepage of water, oil, and noncorrosive coolants.

Indoor use to provide a degree of protection against lint, dust seepage, external condensation, and spraying of water, oil, and noncorrosive liquids.

IP65

   

Comparison of Specific Applications of Enclosures for Indoor Non-hazardous Locations
Enclosure Type
Provides a degree of protection against the following environmental conditions: 1 4 4X 12 13
Incidental contact with enclosed equipment n n n n n
Falling dirt n n n n n
Falling liquids and light splashing   n n n n
Circulating dust, lint, fibers and flyings   n n n n
Settling airborne dust, lint, fibers and flyings   n n n n
Hosedown and splashing water   n n    
Oil and coolant seepage       n n
Oil or coolant spraying and splashing         n
Corrosive agents     n    
Occasional temporary submersion          
Occasional prolonged submersion          

 

Comparison of Specific Applications of Enclosures for Outdoor Non-hazardous Locations
Enclosure Type
Provides a degree of protection against the following environmental conditions: 3 4R 4 4X
Incidental contact with enclosed equipment n n n n
Rain, snow & sleet n n n n
Windblown dust  n   n n
Hosedown     n n
Corrosive agents       n
Occasional temporary submersion        
Occasional prolonged submersion        
This technical information has been contributed by
Metal Cabinet & Fixture Company

Click here to find suppliers

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