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relay is energized only when the emergency power is
available. This option is labeled ERA.
23. Plant Exerciser (Standard)
23J. Load/ No Load Plant Exerciser
This option allows for automatic testing of the generator
at least once a week. Both load and no load testing can
be selected. If the generator fails while in a load test and
the TDEF is set to 0 seconds, the transfer switch will
return to the normal power source automatically. The
plant exerciser may be programmed using the mem-
brane switch located on the enclosure door. The exercis-
er can be programmed to run on any day of the week
and at any hour of the day.
26. Type of Protection (Normal Source)
(Standard)
All phase undervoltage protection is standard. A voltage
sensing card monitors each phase of the normal power
supply, and is factory set at 80% dropout and 90% pick-
up. These values are programmable using the mem-
brane switch and may be adjusted from 50% to 97% of
nominal.
26D. Remote Interruptible Utility Power
(Standard)
This option provides two terminal blocks for connection
of a customer provided normally closed (NC) contact.
When the NC contact is opened, the transfer switch initi-
ates an engine start and will transfer the load to the
emergency power source. Reclosing of the NC contact
will initiate a retransfer back to the normal power source.
32A. Delay Transition Timer (Time Delay Neutral)
(Standard)
Provides a time delay in the neutral (both OFF) position
when the load is transferred in either direction to prevent
excessive in rush currents due to out-of-phase switching
of large motor loads. This timer utilizes a normally open
auxiliary contact from each molded case switch.
Adjustment is from 0 to 120 seconds. This value can be
changed using the membrane switch located on the
enclosure door.
41A. Space Heater
(Optional Kit)
This option provides a thermostatically controlled 100W
space heater to combat accumulation of moisture in the
enclosure.
3.5 ENCLOSURE
The rugged steel switch enclosure is supplied with three
door hinges, regardless of enclosure size, this ensures
proper support of the door and door mounted devices
(Figures 3-5 and 4-1). 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 push-buttons, depending upon the options required
for a particular switch. All switch doors are supplied with
a metal accessory panel. All lights and switches are
mounted in the metal door-mounted panel.
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 position-
ing 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.
Transfer switch enclosures and all internal steel mount-
ing plates, such as the power panel mounting plate, go
through a pretreatment cleaning system prior to painting
to ensure a durable finish.
The standard switch enclosure is NEMA Type 3R.
3.6 STANDARDS
Cutler-Hammer transfer switch equipment enclosed in a
NEMA Type 3R enclosure is listed for application by UL
and UL-C. 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 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 article 701 of the National Electrical Code.
Cutler-Hammer automatic transfer switches are available
to meet NFPA110 for emergency and standby power
systems, and NFPA99 for health care facilities when
ordered with the appropriate options.
