IB140058EN
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Instructional Booklet
Effective: March 2016
Page
9
O&M Manual for 30-1000 Amperes
Manual Transfer Switch
Transfer switch enclosures and all internal steel mounting plates,
such as the power panel mounting plate, go through a pre-treat-
ment cleaning system prior to painting to ensure a durable finish.
The standard switch enclosure is NEMA Type 1 for general indoor
use. A variety of enclosures are, however, available to address
almost any environmental circumstance (Table 3).
Table 3. Transfer Switch Equipment Enclosures
Figure 11. Typical NEMA Type 1 Enclosure (Door Closed).
3.7 Standards
Eaton transfer switch equipment enclosed in a NEMA 1 enclosure
is UL listed for application. In addition, Eaton Transfer Switches
are listed by Underwriters Laboratories Inc. under Standard UL
1008. This standard covers requirements for automatic transfer
switches intended for use in ordinary locations to provide for light-
ing 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 article
701 of the National Electrical Code.
Since Eaton Transfer Switches utilize specially designed molded
case switches and/or molded case circuit breakers as the main
power switching contacts, these devices must also be listed under
the additional UL Standards 489 and 1087. Underwriters Labora-
tories utilizes two basic types of listing programs: a) Label service
b) Re-examination. UL 489 and UL 1087 employ a label service
listing program which requires an extensive follow- up testing pro-
gram for listed devices. Standard UL 1008 for automatic transfer
switches lists devices under the re-examination program which
only requires a continual physical re-examination of the compo-
nents 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 Transfer Switches are
subjected to a complete test program identical to the originally
submitted devices on an ongoing periodic basis per UL 489 and
UL 1087. The frequency of such a re-submittal can be as often as
every quarter for a low ampere device.
NEMA TYPE
DESIGN
PROTECTION
1
Indoor
Enclosed Equipment
3R
Outdoor
Rain, Ice Formation
12
Indoor
Dust, Dirt and
Non-corrosive Liquids
4/4X
Indoor/Outdoor
Dust, Rain, Splashing Water,
Corrosion Resistant
