Type 1 — Indoor general purpose
The standard indoor box: keeps fingers out, keeps nothing else out. Electrical rooms, dry commercial spaces. The most common and least valuable enclosure — but also the most traded, because most gear lives indoors.
REFERENCE
NEMA Enclosure Types, Explained.
Type 1, 3R, 4/4X, 12, 7/9 — what each rating protects against, where each belongs, and why stainless enclosures are assets, not packaging.
REFERENCE
The box matters as much as what is in it.
NEMA enclosure types rate how well an electrical enclosure keeps the environment out: dust, water, oil, corrosive agents. The type number on a panel, disconnect, or control box tells you where it can live — indoors, outdoors, washdown areas, hazardous sites. Misread it and equipment dies young; read it right and every used enclosure lists itself.
Selling enclosures?
Stainless and 3R/4X enclosures hold strong used value. Send photos →
THE COMMON TYPES
NEMA types you will actually meet
Type 3R — Outdoor rainproof
Rain, sleet, snow — the outdoor workhorse. Meter mains, outdoor disconnects, rooftop equipment. Ventilated but weather-shedding. If it is outside and not stainless, it is probably 3R.
Type 4 / 4X — Watertight
Hose-directed water (4); plus corrosion resistance (4X — usually stainless steel or fiberglass). Food plants, car washes, marine, wastewater. 4X stainless enclosures are among the most valuable used boxes per pound.
Type 12 — Dust-tight, drip-tight
Industrial indoor: keeps dust, dirt, and dripping oil/coolant out. Machine shops, factories, anywhere with airborne grime. No knockouts — sealed by gasket.
Type 7/9 — Hazardous locations
Explosion-proof for classified areas (flammable gas/vapor = Type 7, combustible dust = Type 9). Heavy cast construction, precision-machined flanges. Specialized, expensive, and strongly valued used — the installed base in refineries and chemical plants needs exact replacements.
NEMA vs. IP ratings
NEMA types are the North American system; IP codes (IP65, IP66) are the international IEC system. They do not convert directly — NEMA includes corrosion and construction requirements IP ignores. Equipment marked with both is built for world markets.
FOR SELLERS
Enclosures are assets, not packaging
Used enclosure values track material and rating: stainless 4X first, then 4, then 3R, then 12, then 1. Large stainless enclosures and hazardous-location (7/9) boxes command the strongest prices. When listing: state the NEMA type (from the label or construction), material (painted steel, stainless, fiberglass), dimensions, and condition of gaskets and latches. An empty stainless 4X cabinet is worth real money — never scrap one unpriced.
QUICK REFERENCE
The full type chart
The complete NEMA ladder, indoors to hazardous: 1 — indoor, general purpose. 2 — indoor, drip-tight. 3 — outdoor, rain/sleet/snow. 3R — outdoor, rainproof (the common one). 3S — outdoor, operable in ice. 4 — watertight, hose-directed water. 4X — watertight plus corrosion-resistant. 5 — dust-tight indoor. 6/6P — submersible. 12 — industrial dust/drip-tight, no knockouts. 13 — oil/coolant-tight for machine tools. 7 — hazardous, gas/vapor (explosion-proof). 9 — hazardous, combustible dust. The suffix matters as much as the number: a 4 and a 4X look similar and live in different worlds (and price bands). When the label is gone, material tells the story — stainless or fiberglass means 4X, cast and bolted-flange means 7/9.
QUESTIONS
NEMA questions, answered.
What NEMA enclosure do I need outdoors?
Type 3R minimum for rain/snow exposure. Choose 4/4X where hose-directed water or corrosive conditions exist. Check local code and the equipment listing.
What is the difference between NEMA 4 and 4X?
Both are watertight against hose-directed water; 4X adds corrosion resistance (typically stainless steel or fiberglass). 4X costs more and holds more used value.
Are NEMA and IP ratings the same?
No — NEMA is the North American system, IP is the international IEC system. They do not convert directly; NEMA includes corrosion and construction criteria IP lacks.
Can I use a NEMA 1 panel outdoors?
No — Type 1 is indoor only, with no water protection. Outdoor installations need 3R or better, and code requires the enclosure listing to suit the location.
Are used stainless enclosures worth anything?
Yes — among the strongest values in used electrical: corrosion-proof, long-lived, and expensive new. Photograph the label, dimensions, and gasket/latch condition.
HOW IT WORKS
Three steps to an offer.
01Send photos
Photograph the equipment, nameplates, and quantities in place, then send them through the contact form.
02Material review
We review what the equipment is, its condition and quantity, and how it grades for resale versus recovery.
03Receive an offer
For qualifying material, we discuss a direct purchase offer and the next steps.