Eaton Industrial Switchgear - General Information

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2010 CA08103002Z-EN
22/8 Switchgear for North America
America because of the significant
export share of these devices and
because standards, selection and
usage criteria that differ from IEC and
EN must be specially considered. In
engineering, North American
practices must often be observed (for
example regardingoperating elements
for main switches). Where all articles
on a page or double page are
approved, the whole page or double
page is marked only once with the flag
symbols in the page header. If a page
or double page also contains articles
that are not approved for North
America, the approved articles are
indicated with flags as groups or per
article in column “Std. pack”. In this
column, articles are sometimes
grouped together with stylized paren-
theses.
Unfortunately mere marking with flags
and approval marks on the devices is
not always sufficient proof of approval
for inspectors. Occasionally, doubts
may arise as to the admissibility of the
use of the approved devices for
specific tasks. In such cases, the the
numbers of the certification reports, or
even the reports themselves, must be
available. To facilitate this, the
ordering pages of this catalog provide
information relevant for export to
North America, which include the UL
and CSA certification report numbers
as well as the relevant Category
Control Numbers (UL)1) or Classes
(CSA)2).
Customers can find the most important
excerpts from the certification reports
for most of the NA-approved articles
by entering the product group, e.g.
DILM..., and the approval organization
in the approvals database for Eaton’s
Moeller-branded products3). Unfortu-
nately the approval records not drawn
up by Eaton Moeller are often poorly
structured and hard to read. In some
cases, the part numbers of the
approved products are given with
varying degrees of accuracy. The
approval organizations’ Inspectors
can also access the full approval
records through their organizations.
In the event of difficulties, which often
arise out of misunderstandings, please
contact Eaton. We are continually
working to improve and complete the
approvals situation, which will there-
fore change in this catalog’s validity
period. Eaton Electric’s database and
online catalog4) will, however, be
regularly updated with all changes. In
the online catalog, you can dynami-
cally create up-to-date data sheets for
products to save as PDF files and print
out.
You can also access the certification
reports through the databases of the
approvals organizations:
• Access to the UL database is
through the address
-
bin/XYV/template/LISEXT/1FRAME
/index.html
• For CSA , visit .
csa-international.org/.
For CSA, the certification report
numbers in the CSA database do not
always correspond with the numbers
of the approval records issued to
Eaton or Moeller. To find the required
record, you should therefore always
enter the name “Moeller” and the
Class Number (from the selection page
in the catalog).. Do not use “Eaton”
here yet.
For products with approvals s world-
market devices, the technical data is
given at the end of each chapter of the
catalog, where you can also find the
IEC/EN data. Although the contactors
and motor starters are also approved
as world-market devices, they have
special selection pages to take into
account the North American voltages
and HP ratings. Because motors rated
in kW are often used for exported
plants and machines, it must be
remembered that inspectors convert
kW into HP ratings5) and reading the
standard currents for the next largest
standard motors rated in HP from the
NEC or CEC. This can result in the need
to use larger conductor cross-
sections. Design engineers should
also follow this practice when dimen-
sioning systems. When working to
North American codes and standards,
further correction factors for dimen-
sioning components and cables must
also be observed.
For the North America versions of
circuit breakers NZM and molded
case switches NS...-NA the main
catalog contains comprehensive
selection information. Those pages
contain, for example, switches with
fixed overload releases (NZM…-
AF…-NA), which, in the USA, are
combined to motor starters for higher-
rated motors with a contactor and
overload relay. Switches of this kind
are not common in IEC/EN countries.
The switches of construction size
NZM...2…-NA also cover the current
ranges of switches NZM...1…-NA. In
all, the range of models for the North
American market is greater than that
for the IEC/EN market. The selection
pages for the special devices for the
NA market contain the data required
for selecting the appropriate switches.
Further, less frequently required data
for engineering is included under
“Technical data” at the end of the
chapter. Because more information is
required for the complex circuit
breakers than for other devices, the
information for North America
contains further important details,
such as whether their use in feeder
and/or branch circuits is permissible,
or whether the switches are approved
as current-limiting devices. For circuit
breakers with part number suffix
“- CNA” (Recognized Component), a
stated Condition of Acceptability (CoA)
is that these devices must always be
combined with a contactor and an
overload relay. See also the motor
starter selection table (page 8/30).
Only these complete combinations
have a specified, stated short-circuit
current rating (SCCR).
Voltage types and network
configurations in North America
For the use of some devices, such as
motor-protective circuit breakers and
some motor starters, the maximum
permissible “full voltage”6) (e.g. 480 V,
600 V) or “slash voltage”7) (e.g.
480 Y/277 V, 600Y/347 V) must be
observed. Devices for which slash
voltages are mandatory, must be used
only with star networks with solid
grounding. These networks can be
installed with or without neutral
conductor. In North America three-
phase networks are usually three-
pole. Devices for full voltages can be
used in star and delta networks,
irrespective of the type of grounding.
In combination, some devices can also
be approved for smaller full voltages
and larger slash voltages. The decisive
factor for the permitted network
configuration in this case is the
actually used voltage. If only a single
device in a switchgear system can be
used for a slash voltage, this slash
voltage must be stated on the switch-
gear system’s rating plate.
Some devices can not be usedwith the
600 V often found in Canada. This may
be true even if these devices are
IEC/EN-approved for up to 690 V. This
restriction is due to the differing test
conditions specified by the North
American standards. For exports to
Canada, many customers use
600/480 V or 600/400 V matching
transformers to avoid any restrictions
due to the high voltage of 600 V at the
engineering stage. When using trans-
formers with separate windings, a
separate, grounded star network can
be connected to the transformer’s
output side to allow the use of devices
approved only for slash voltages.
Most North American component
standards currently specify a
maximum of 600 V for l.v. systems. It
has become apparent that these
voltages are no longer sufficient for
new technologies with high ratings,
such as photovoltaics or wind power.
New standards are currently being
developed that will, in future, allow
higher voltages. These changes will
also have to be made, for example, in
the UL 489.
When using switching and protective
devices, the voltage indications, such
as 115 V or 120 V, 230 V or 240 V, 460 V
or 480 V, 575 V or 600 V, often cause
irritation. The higher of the two stated
voltages in each case is the rated
service voltage8). The lower of the two
values is the Utilization Voltage9),
which is the voltage between the point
of connection10) to the consumer
system to the point at which the
apparatus is connected. To a mains
supply with a rated voltage of, for
example, 480 Vmotors dimensioned for
460 V can be connected. The same
applies for the other voltage pairs. To
simplify device selection, Eaton has
included both voltage values in its NA
motor starter tables, even though
motors with, for example, 480 V are not
usual.
In connection with approvals, a great
deal of information must be made
available to users. The most important
information is contained on the
devices’ rating plates and in the
catalog. For some devices, further
details that are relevant mainly for
installation, are included in the instal-
lation instructions11)included with the
devices. The required information is
specified in the standards or, in some
individual cases, by the approval orga-
nizations in the approval documents.
To ensure the large clearances and
creepage distances for feeder
circuits, circuit breakers must always
be fitted with insulating components
and covers. To limit the vendor’s
liability, the installation instructions for
the device and for the switchgear
systems in which it is installed should
be handed on to the end customer and
the operator.
Codes and standards
in North America
As with IEC and European standards,
North American standards can be
divided into those that apply to
individual products and those that
apply to assembled installations.
Product-related standards, such as
UL 489, UL 508, UL 508C, and UL 1077)
apply mainly to component manu-
facturers, while system-related stan-
dards, such as UL 508A and NFPA 79
are relevant mainly for companies that
process these components. Canada
dos not have installation-related stan-
dards in some cases. The statutory
requirements are not incorporated in
the CEC and CSA standards as clearly.
In these cases, it is advisable to use
the US installation-related standards
as a guideline for engineering, as
these have similar requirements.
Component manufacturers and
machine/system builders that use
third-party components should each
be familiar with the respective other
type of standard. Note that, in addition
to the national US and Canadian stan-
dards, member states or provinces
and larger cities may have additional
legal requirements that must be met by
system builders when supplying to
these regions. In the USA, the latest
NEC standards do not always apply in
all states.
Device types in North America
This main catalog takes into account
the fact that a distinction is made in
Canada and the USA between
Distribution Equipment and Industrial
Control Equipment:
Distribution equipment
This includes for example:
• Circuit-breakers (UL 489,
CSA-C22.2 No. 5-09).
• Load interrupters (UL 489,
CSA-C22.2 No. 5-09).
• Switch-disconnectors (UL98,
CSA-C22.2 No. 4-04).
• Fuses (UL 248,
CSA-C22.2 No.248).
• Fuse switch-disconnectors (UL98,
CSA-C22.2 No. 4-04).
Notes
1) System of categorization in the USA, corresponds with UL White Book, UL 508A
2) System of categorization in Canada, corresponds with CSA
3)
4) de.ecat.moeller.net
5) HP = horse-power
6) Voltage between phases
7) Voltage between phase and neutral
8) Service Voltage
9) Point of Connection, Point of Common Coupling
10) Utilization Voltage
11) AWA = Moeller nomenclature: Installation instructions,
IL = Eaton nomenclature: Instructional Leaflet