IB01602007E
For more information visit: www.cutler-hammer.eaton.com
Instruction Bulletin
Effective: June 2003
Page
13
O&M Manual for
Non-Automatic Transfer
Switches (30 – 1200 Amperes)
3.6 Enclosure
The rugged steel switch enclosure is supplied with three
door hinges, regardless of enclosure size, to ensure proper
support of the door and door-mounted devices (Figure 11).
The hinges have removable hinge pins to facilitate door
removal. Certain procedures, such as switch mounting, are
simplified with the door removed. The doors are supplied
as standard with a key lockable handle.
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, pushbuttons
or switches are required, they are normally mounted in
the plastic door-mounted panel.
The rear of the enclosure is supplied with elongated holes in
the top and bottom mounting flanges to facilitate mounting.
The vertical design is also supplied with two positioning bolts
and various pre-tapped inserts to ensure proper positioning
of the power panel, anytime the power panel must be reposi-
tioned to accommodate a different cable entry position.
Cable entry holes are the responsibility of the customer.
Transfer switch enclosures and all internal steel mounting
plates, such as the power panel mounting plate, go through
a pre-treatment 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 2).
Figure 12. Typical NEMA Type 1 Enclosure (Door Closed)
Table 2. Transfer Switch Equipment Enclosures
3.7 Standards
Cutler-Hammer transfer switch equipment enclosed in
a NEMA 1 enclosure is UL listed for application. In addition,
Cutler-Hammer 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
T
, 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.
Since Cutler-Hammer 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 Laboratories
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 program for listed devices. Standard UL 1008 for
automatic transfer switches lists devices under the re-exami-
nation program which only requires a continual physical
re-examination 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 Cutler-Hammer
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
3R
Indoor
Outdoor
Enclosed Equipment
Rain, Ice Formation
12
4/4X
Indoor
Indoor/Outdoor
Dust, Dirt and Non-corrosive Liquids
Dust, Rain, Splashing Water,
Corrosion Resistant
