Enclosure; Standards - Eaton Cutler-Hammer O & M Manual

IB01602002E

3.7 ENCLOSURE

The rugged steel switch enclosure is supplied with three
door hinges to insure proper support of the door and door
mounted devices. The hinges have removable hinge pins
to facilitate door removal. The doors are supplied as stan-
dard with a key lockable handle. Cable entry holes are
the customer's responsibility.
The door is used to mount a variety of lights, switches
and pushbuttons, depending upon the options required
for a particular switch. All switch doors are supplied with
a heavy duty plastic accessory panel in place, whether
or not external devices are required. When lights, push-
buttons or switches are required, they are normally
mounted in the plastic door mounted panel.
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. Should the enclosure
become scratched and in need of touch up paint, use
ANSI 61.
The standard switch enclosure is NEMA Type 1 for gen-
eral indoor use (Table 3.1).

3.8 STANDARDS

Cutler-Hammer transfer switch equipment enclosures
are listed for application by UL, and are certified to meet
Canadian Standards by Underwriters Laboratories Inc.
(CUL). In addition, Cutler-Hammer Automatic Transfer
Switches are listed in File E38116 by Underwriters
Laboratories, Inc. under Standard UL 1008. This stan-
dard covers requirements for automatic transfer switch-
es intended for use in ordinary locations to provide for
lighting and power as follows:
Table 3.1 Transfer Switch Equipment Enclosures
NEMA Design
Type
1 Indoor
3R Outdoor
4/4X Indoor/Outdoor
12 Indoor
Effective 10/02
Protection
Enclosed Equipment
Rain, Ice Formation
Dust, Rain, Splashing, Water,
Corrosion Resistant
Dust, Dirt and Non-corrosive
Liquids
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 NFPA 99 for health care facilities
when ordered with the appropriate options.
Since Cutler-Hammer Automatic Transfer Switches uti-
lize specially designed switches and/or circuit breakers
as the main power switching contacts, these devices
must also be listed under the additional UL Standards
489 and 1087. Underwriters Laboratories 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 components used in the
product to insure consistency with the originally submit-
ted device. Follow-up testing is not required by UL1008.
Representative production samples of switches and cir-
cuit breakers used in Cutler-Hammer Automatic Transfer
Switches are subjected to a complete test program identi-
cal to the originally submitted devices on an ongoing peri-
odic basis per UL489 and UL1087. The frequency of such
a re-submittal can be as often as every quarter for a low
ampere device.
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