The following table contains
electrical enclosure ratings for non-hazardous environments.
These classifications, issued by UL Laboratories, NEMA and
CSA should prove helpful in evaluating applications.
One noteworthy item is that
all of the NEMA 4 magnetic reversing starters currently
offered in the 1991 MHD55006 price list are supplied
with stainless steel enclosures. This upgrades their
rating to a NEMA 4X, whenever stainless steel enclosures
meet the corrosion resistant requirements.
Many thanks to our electrical
engineer, Bill Anthis for supplying this information.
|
|
National
Electrical Manufacturers Associations (NEMA)
|
Underwriters
Laboratories Inc. (UL) |
Canadian
Standards Association (CSA) |
|
| Type
|
Intended
Use and Description |
Intended
Use and Description |
Intended
Use and Description |
|
| 1
|
Enclosures
are intended for indoor use primarily to provide
a degree of protection against contact with
the enclosed equipment or locations where unusual
service conditions do not exist. |
Indoor
use primarily to provide protection against
contact with the enclosed equipment and against
a limited amount of falling dirt |
General-purpose
enclosure. Protects against accidental contact
with live parts. |
|
| 2
|
Enclosures
are intended for indoor use primarily to provide
a degree of protection against limited amounts
of falling water and dirt. |
Indoor
use to provide a degree of protection against
limited amounts of falling water and dirt. |
Indoor
use and so constructed or protected that exposure
to falling moisture will not impair the effectiveness
of the enclosed equipment. |
|
| Type
|
Intended
Use and Description |
Intended
Use and Description |
Intended
Use and Description |
|
| 3
|
Enclosures
are intended for outdoor use primarily to provide
a degree of protection against windblown dust,
rain and sleet; undamaged by the formation of
ice on the enclosure. |
Outdoor
use to provide a degree of protection against
windblown dust and windblown rain; undamaged
by the formation of ice on the enclosure. |
Outdoor
use and so constructed or protected that exposure
to the weather, to falling moisture, or to external
splashing will not impair the effectiveness
of the enclosed equipment. |
|
| 3R
|
Enclosures
are intended for outdoor use primarily to provide
a degree of protection against falling rain
and sleet; undamaged by the formation of ice on the
enclosure. |
Outdoor
use to provide a degree of protection against
falling rain and sleet; undamaged by the formation
of ice on the enclosure. |
No
CSA equivalent. |
|
| Type
|
Intended
Use and Description |
Intended
Use and Description |
Intended
Use and Description |
|
| 4
|
Enclosures
are intended for indoor or outdoor use primarily
to provide a degree of protection against windblown
dust and rain, splashing water, and hose-directed
water; undamaged by the formation of ice on the enclosure.
|
Either
indoor or outdoor use to provide a degree of
protection against falling rain, splashing water,
and hose-directed water, undamaged by the formation
of ice on the enclosure. |
Indoor
or outdoor use and so constructed that a stream
of water from a hose will not result in water
entering the enclosing case. |
|
| 4X
|
Enclosures
are intended for indoor or outdoor use primarily
to provide a degree of protection against corrosion,
windblown dust and rain, splashing water, and
hose-directed water; undamaged by the formation of
ice on the enclosure. |
Either
indoor or outdoor use to provide a degree of
protection against falling rain, splashing water,
and hose-directed water, undamaged by the formation
of ice on the enclosure; resists corrosion.
|
No
CSA equivalent. |
|
| Type
|
Intended
Use and Description |
Intended
Use and Description |
Intended
Use and Description |
|
| 12
|
Enclosures
are intended for indoor use primarily to provide
a degree of protection against dust, falling
dirt, and dripping noncorrosive liquids. |
Indoor
use to provide a degree of protection against
dust, dirt, fiber flying, dripping water, and
external condensation of noncorrosive liquids. |
No
CSA equivalent. |
|
| 13
|
Enclosures
are intended for indoor use primarily to provide
a degree of protection against dust, spraying
of water, oil, and noncorrosive coolant. |
Indoor
use to provide a degree of protection against
lint, dust seepage, external condensation and
spraying of water, oil, and noncorrosive liquids.
|
No
CSA equivalent. |
|
