IB140042EN
For more information visit: www.eaton.com
Instructional Booklet
Effective: May 2015
Page
17
ATC-300/900 Breaker Based Transfer Switch
The rear of the enclosure is supplied with teardrop shaped holes in
the top and bottom mounting flanges to facilitate mounting. It is
also supplied with two positioning bolts and various pre-tapped
inserts to insure proper positioning of the power panel anytime the
power panel must be repositioned to accommodate a different
cable entry position. Cable entry holes are the responsibility of
the customer.
ATS enclosures and all internal steel mounting plates, such as the
power panel mounting plate, go through a pretreatment cleaning
system prior to painting to ensure a durable finish.
The standard ATS enclosure is NEMA 1 Type for general use.
However, a variety of enclosures are available to address almost
any environmental circumstance (see Table 3).
Table 3. Transfer Switch Equipment Enclosures
3.7 Standards
Eaton ATS equipment, enclosed in any of the enclosures listed in
Table 3, is listed for application by UL and ULC. In addition, Eaton
ATSs are listed in File E38116 by Underwriters Laboratories, Inc.
under Standard UL 1008. This standard covers requirements for
automatic transfer switches intended for use in ordinary locations
to provide lighting and power as follows:
a. In emergency systems, in accordance with articles 517
and 700 in the National Electrical Code, ANSI/ NFPA 70,
and the National Fire Protection Association No. 76A; and/
or
b. In standby systems, in accordance with article 702 of the
National Electrical Code; and/or
c. In legally required standby systems in accordance with arti-
cle 701 of the National Electrical Code.
Eaton ATSs are available to meet NFPA 110 for emergency and
standby power systems, and NFPA 99 for health care facilities
when ordered with the appropriate options.
Since Eaton ATSs use specially designed molded case switches or
circuit breakers the main power switching contacts, these devices
must also be listed under the additional UL Standards 1087 and
489. UL uses two basic types of listing programs - label service
and reexamination.
UL1087 and 489 employs a label service listing program which
requires an extensive follow-up testing program for listed devices.
Standard UL 1008 for ATSs lists devices under the reexamination
program which only require a continual physical reexamination of
the components used in the product to ensure consistency with
the originally submitted device. Follow-up testing is not required
by UL 1008.
Representative production samples of molded case switches and
molded case circuit breakers used in Eaton ATSs are subjected to
a complete test program identical to the originally submitted
devices on an ongoing, periodic basis per UL 1087 and 489. The
frequency of such a re-submittal can be as often as every quarter
for a low ampere device.
NEMA TYPE
DESIGN
PROTECTION
Open
Indoor
1
Indoor
Enclosed Equipment
3R
Outdoor
Rain, Ice Formation
4/4X
Outdoor
Hose Down,
Non-corrosive
12
Indoor
Dust, Dirt and
Non-Corrosive Liquids