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Glossary Terms for

NEMA Enclosures

NEMA enclosures are electrical and industrial enclosures rated by the National Electrical Manufacturers Association (NEMA) according to the level of environmental protection they provide.

Back Panel (Mounting Panel)
A removable flat sheet metal plate mounted inside the enclosure on which electrical components such as DIN rail, terminal blocks, relays, circuit breakers, and VFDs are mounted and wired before installation into the enclosure body.
Custom Enclosure Fabrication
The design and manufacturing of electrical or industrial enclosures to customer-specified dimensions, mounting configurations, cutout patterns, and material specifications.
DIN Rail
A standardized 35mm metal rail used inside electrical enclosures to mount modular control components including circuit breakers, terminal blocks, relays, and power supplies.
Gasketed Seam
A sealed joint between the enclosure body and door incorporating a compressible elastomeric gasket.
Knockouts
Pre-formed, partially punched circular openings in enclosure walls that are removed to accommodate conduit fittings, cable entries, and glands.
Lift-Off Hinge
A door hinge design that allows the enclosure door to be completely removed by lifting it vertically off the hinge pin.
NEMA 1 Enclosure
An indoor enclosure providing protection against contact with internal components and falling dirt.
NEMA 12 Enclosure
An industrial indoor enclosure providing protection against dust, falling dirt, and dripping non-corrosive oils and coolants.
NEMA 3R Enclosure
An outdoor-rated enclosure protecting against falling rain, sleet, and ice formation.
NEMA 4 Enclosure
A watertight enclosure that withstands windblown rain, splashing water, and direct hose-directed water from any direction.
NEMA 4X Enclosure
A corrosion-resistant, watertight enclosure providing NEMA 4-level water protection plus resistance to corrosive agents.
NEMA Rating
A classification published by the National Electrical Manufacturers Association defining the environmental and mechanical protection provided by an electrical enclosure.
Panel Cutout
A precision-machined or punched opening in the enclosure door or side panel for mounting pilot lights, pushbuttons, selector switches, meters, displays, and HMI screens.
Rack-Mount Enclosure
A standardized enclosure designed to house rack-mounted electronics, servers, network equipment, and control components.
Stainless Steel Enclosure
An enclosure fabricated from 304 or 316L stainless steel for maximum corrosion resistance and cleanability.
UL 508A
The Underwriters Laboratories standard for Industrial Control Panels.
Wall-Mount Enclosure
An enclosure designed for direct mounting to a wall using a back panel mounting flange, used where space constraints make floor-standing equipment impractical.
Welded Seam Enclosure
An enclosure in which all panel joints and corners are continuously welded, producing a seamless, rigid, and aesthetically clean enclosure body preferred for stainless steel and custom fabricated enclosures.

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