Appendix C: Drive Enclosure Types

The following information is an overview of NEMA enclosures available for drives. For detailed descriptions consult the National Electrical Manufacturers Association (NEMA) Standards Publication No. 250. Refer to the sales manual for specific ABB enclosures available as standard or as an option.

Enclosures normally do not protect devices against internal conditions such as condensation, corrosion, or contamination. The user is responsible for protecting equipment from these conditions.

Enclosures normally do not protect internal devices against conditions such as condensation, icing, corrosion, or contamination. These conditions may occur inside the enclosure or may enter by way of the conduit or unsealed openings. Ultimately, protection is in the hands of the user who must take adequate precautions to protect the equipment inside the enclosure.

NEMA Type 1 (Surface Mounting) (IP 21)

These enclosures provide a degree of protection against contact with the enclosed equipment; they are intended for indoor use and in typical service conditions. The enclosure is sheet steel, treated to resist corrosion.

NEMA Type 1 (Flush Mounting)

These enclosures are for installation in machine frames and plaster walls; they are for similar applications and are designed to meet the same tests as NEMA Type 1 surface mounting.

NEMA Type 3

These enclosures are intended for outdoor use primarily to provide a degree of protection against windblown dust, rain, sleet, and external ice formation. They are designed to meet rain,¹ external icing,² dust, and rust-