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Electronic Enclosures Terms

Attenuation – A reduction in signal strength. Attenuation can occur naturally during normal signal transmission, or it may be produced intentionally by inserting a device in the path of the signal to reduce signal strength.

Bounding Surface – The outer surface of the electrical enclosure.

Cabinet – Often used interchangeably with either enclosure or rack. It is a piece of equipment designed to house or enclose something, such as electrical or process equipment.

Cable Glands – Seals that prevent water, dust, etc. from entering the enclosure at the point at which the cable is brought through the enclosure wall. Often, cable glands are installed via a gland plate.

EMI (Electromagnet Interference) Emission – The unintentional or undesired exiting of potentially interfering electromagnetic energy from electrical/electronic sources.

Flame Retardancy – The ability of a material to resist burning, sparking, sputtering or dripping when brought into contact with a naked flame. Not all enclosures are flame retardant.

Gear Tray – Also called a “mounting plate” or “mounting pan,” it is a shelf that allows the mounting of equipment inside the enclosure. Gear trays are typically located at the rear of the enclosure, though some may be movable.

Gland Plate – Removable section of the enclosure, usually located on the bottom. The gland plate can be removed to allow the easy fitting of cable glands.

Permeability – The extent to which a material can be magnetized.

Plinth – Term used to describe various styles of mounting bases for floor-mounted enclosures.

Shielded Cables – Cables that have shields, such as braids or foils, to prevent EMI from entering or exiting the cable.

Rated Current – The input current of the equipment as declared by the manufacturer.

Shielding Vents – Vents that are used for HVAC or simple ventilation of shielded products, such as cabinets, rooms or enclosures. Some shielding vents also provide high shielding or air filtering.

Shielded Windows – Shielding consisting of a thin conductive film on the glass or a fine-wire mesh or metalized open-mesh textile.

Shielding Gasket – A material that maintains shielding effectiveness across a seam or gap in an electronic enclosure.

Type 1 – A NEMA rating indicating that the enclosures are intended for indoor, non-hazardous locations. Type 1 enclosures are mainly used to provide protection against limited amounts of falling dirt.

Type 3R – A NEMA rating indicating that the enclosures are intended for use in outdoor, non-hazardous locations. Type 3R enclosures are mainly used to provide protection against falling rain and external ice formation.

Type 4 – A NEMA rating indicating that the enclosures are intended for indoor or outdoor use in non-hazardous locations. Type 4 enclosures are mainly used to provide protection against splashing or hose-directed water, damage from external ice formation and windblown dust or rain.

Type 12 – A NEMA rating indicating that the enclosures are intended for indoor use in non-hazardous locations. Type 12 enclosures are mainly used to provide protection against dripping, non-corrosive liquids, circulating dust and falling dirt.