Cut Sheet

Volume 10—Enclosed Control CA08100012E—November 2012 www.eaton.com V10-T13-3
13
13
13
13
13
13
13
13
13
13
13
13
13
13
13
13
13
13
13
13
13
13
13
13
13
13
13
13
13
13
13.1
Alternate Enclosures
Enclosure Options
316 Stainless Steel
Enclosures
Many people believe that
stainless steel is not
susceptible to corrosion.
While stainless steel greatly
improves corrosion resistance,
it is still potentially susceptible
to corrosion. Certain
chemicals, salts, chlorides
and acid can corrode stainless
steel. Corrosion resistance
varies among the different
grades of stainless steel due
to the chemical composition
of the individual grade and is
the result of the formation of
an oxide film on the surface
of the metal. This film can be
damaged when used in harsh
environments
containing
chlorides, chemicals
and salts,
which attack the film and lead
to some types of corrosion.
There are many forms of
corrosion beyond that of well-
known rust. Other common
forms of corrosion that may
come into play at customer
installations include galvanic
or two-metal corrosion and
pitting corrosion. Galvanic
corrosion occurs when two
dissimilar metals are placed in
contact or are electrically
connected. A potential
difference produces electron
flow between the metals that
results in increased corrosion
of the less corrosion-resistant
metal and a decrease in
corrosion of the more
resistant material than would
occur if the metals were not
in contact. Pitting is typically
in the form of localized attack
that creates holes in the
metal. These holes may be
very small and difficult to
detect due to accompanying
rust. 304-Grade stainless
steel is susceptible to this
form of corrosion in certain
atmospheres.
Fortunately, there are options
available for applications
where 304-Grade stainless
steel is susceptible to
corrosion. Enclosures
manufactured with 316-Grade
stainless steel offer even
better corrosion resistance to
most chemicals, salts and
acids and are better suited for
installation in marine
atmospheres. In marine
atmospheres, 304-Grade
stainless steel may develop
staining with patches of
yellowish-brown film. 316-
Grade stainless steel yields
improved pitting corrosion
resistance versus other
grades of stainless (for
example, 304-Grade) where
brines, highway de-icing salts
or chlorides are present.
For ordering this option,
change the 7th digit in the
catalog number to a 9 (that is,
ECN2221AAF becomes
ECN2229AAF).
Type 3R Stainless Steel
Enclosures
Often, customers are looking
for enclosures to install
outdoors where they will be
exposed to harsh
environmental conditions
including salt, acid rain,
chemical run offs and mist. In
these applications, the unit
will not be exposed to high-
pressure wash downs.
Therefore, the customer does
not need a fully rated Type 4
enclosure, but rather a
product with a higher
resistance to corrosion than
standard carbon steel. This
product design meets the
customers’ needs.
Pump panel applications will
be the primary use for the
Type 3R stainless steel
option. It offers customers
the opportunity to replace
their carbon steel Type 3R
enclosures with a stainless
steel unit that will help resist
rusting. For pump panels
(ECN54/55, ECT54/55 and
ECP54/55), this option is
especially attractive.
For ordering this option,
change the 7th digit in the
catalog number to an A (that
is, ECN2221AAF becomes
ECN222AAAF).
Type 7/9 Explosion Proof
Enclosures
Some applications are
exposed to areas in which
hazardous materials are
handled or stored. These
environments
require
explosion proof enclosures.
Class I locations require the
type of explosion-proof
electrical equipment where,
in case of explosion, the
hazardous flames would be
contained. In Class II or III
locations, dust, fibers and
flyings are the combustible
materials and it is only
necessary to keep these
materials out of the electrical
equipment (where an arc may
take place) and to maintain
safe external temperatures.
Further refinement created
for the purpose of testing and
approving electrical
equipment divides Class I
into four separate
designations: A, B, C, D and
Class II into three separate
designations; E, F and G.
Underwriters Laboratories
test and approve electrical
equipment for the specific
groups.
For more descriptions on
code and class definitions,
see Ta b 9 .
For ordering this option,
change the 7th digit in the
catalog number to a 6 for
bolted design, and 7 for
threaded design. (that is,
ECN2221AAF becomes
ECN2227AAF).
Paint Options
With a full line paint shop, we
can offer custom solutions for
our customers. In many
cases this includes custom
colors for your panels. This
helps in establishing brand
identity for our OEM
customers and differentiates
them from their competition.