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cable entry position. Cable entry holes are the responsi-
bility of the customer.
Transfer switch enclosures and all internal steel mount-
ing plates, such as the power panel mounting plate, go
through a pre-treatment cleaning system prior to paint-
ing to insure a durable finish.
The standard switch enclosure is NEMA Type 1 for gen-
eral indoor use. A variety of enclosures are, however,
available to address almost any environmental circum-
stance (Table 3.1).
3.7 STANDARDS
Cutler-Hammer transfer switch equipment enclosed in a
NEMA 1 enclosure is listed for application by UL. In
addition, Cutler-Hammer Automatic Transfer Switches
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 for 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 stand-by systems, in accordance with article 702
of the National Electrical Code and/or
c. In legally required stand-by systems in accordance
with article 701 of the National Electrical Code.
Cutler-Hammer Automatic Transfer Switches are avail-
able to meet NFPA 110 for emergency and stand-by
power systems, and NFPA99 for health care facilities
when ordered with the appropriate options.
Since Cutler-Hammer Automatic Transfer Switches uti-
lize specially designed molded case switches and/or
molded case circuit breakers as the main power switch-
ing contacts, these devices must also be listed under the
additional UL Standards 489 and 1087. Underwriters lab-
oratories utilize two basic types of listing programs: a)
Label service b) Re-examination. UL489 and UL1087
employ a label service listing program which requires an
extensive follow-up testing program for listed devices.
Standard UL1008 for automatic transfer switches lists
devices under the re-examination program which only
requires a continual physical re-examination of the com-
ponents used in the product to insure consistency with
the originally submitted device. Follow-up testing is not
required by UL1008.
Representative production samples of molded case
switches and molded case circuit breakers used in Cutler-
Hammer Automatic Transfer Switches are subjected to a
complete test program identical to the originally submitted
devices on an ongoing periodic basis per UL489 and
UL1087. The frequency of such a re-submittal can be as
often as every quarter for a low ampere device.
NEMA
Design
Protection
Type
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
Table 3.1 Transfer Switch Equipment Enclosures
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