NEMA 9 enclosures are designed to prevent the ignition of combustible dust. The enclosures prevent dust from entering and prevent enclosed heat generating devices from causing external surfaces to reach temperatures capable of igniting dust on the enclosure or igniting dust in the air surrounding the enclosure.

NEMA 9 enclosures are intended for indoor use in locations classified as Class II, Groups E, F, or G.

Class II: Locations in which combustible dust may be found. These locations are further broken down into groups rated for the particular type of dust that may be in the atmosphere.

Group E: Atmospheres containing combustible metal dusts, such as aluminum, magnesium and their commercial alloys.

Group F: Atmospheres containing combustible carbonaceous dusts with 8% or more trapped volatiles such as carbon black, coal or coke dust.

Group G: Atmospheres containing combustible dusts such as flour, grain, starch, sugar, wood, plastic and chemicals.



The D9N series of enclosures consist of a watertight gasket, clamped cover, continuous piano type hinge, internal grounding lug and optional gland plates. The D9SC series of enclosures consist of a watertight gasket, hex head cover bolts, internal grounding lug and optional gland plates. The enclosures may be mounted in a vertical or horizontal position and can be fitted with up to two gland plates per side to provide future expansion and configuration.

Adalet’s NEMA 9 enclosures include:

  • D9N Series – clamped cover
  • D9SC Series – screw cover



Manufacturers tend to build one enclosure rated as NEMA 7 and NEMA 9.

These enclosures are most frequently used in dusty environments, such as grain elevators, food and beverage factories, chemical refineries and offshore drilling platforms.


Learn more about NEMA ratings and NEMA enclosures.

Contact Adalet to speak with an engineer about choosing the right NEMA 7 enclosure for my application.