NEMA

In our continuing blogs about NEMA ratings for electrical enclosures, today we’ll look at the NEMA 4 and 5 ratings. NEMA rates panels on a scale of specification numbered 1 through 13, with numbers 1, 4 and 12 normally used for panels.

NEMA 4

To be classified as a NEMA 4 panel, the enclosure must be constructed for either indoor or outdoor use, to provide a degree of protection to prevent incidental contact to enclosed equipment by any personnel, to provide a degree of protection against falling dirt, rain, sleet, snow, windblown dust, and splashing or hose directed water. The enclosure must remain undamaged by the external formation of ice on it. NEMA 4 panels are normally constructed of painted carbon steel.

NEMA 4X

To be classified as NEMA 4X, the panel must provide all the protection as noted in NEMA 4, as well as provide protection of the panel enclosure itself from corrosion. NEMA 4X panels will normally be constructed of stainless steel, or fiberglass.

NEMA 5

A NEMA 5 classified panel provides a degree of protection to personnel against incidental contact with the enclosed equipment, and to provide a degree of protection against falling dirt, settling airborne dust, lint, fibers, and dripping or splashing of liquids.

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