Generac Power Systems RXUW200A3 User manual

Owner’s Manual
For
Automatic Transfer Switch
150 - 200 Amp, Ringless Meter Socket, Service Entrance Rated
Model Number
Integrated Meter Transfer Switch
RXUW200A3 – 200A
RXUW200A3LV – 200A with Lever Bypass
RXUW150A3 – 150A
RXUW150A3LV – 150A with Lever Bypass
Upgradeable Integrated Meter Transfer Switch
RBU200A3 – 200A
RBU200A3LV – 200A with Lever Bypass
RBU150A3 – 150A
RBU150A3LV – 150A with Lever Bypass
G0074000 – RBU Transfer Switch Upgrade Kit
SERIAL NUMBER: _________________________
DATE PURCHASED:________________________
WWW.GENERAC.COM
888-436-3722
Para español , visita:http://www.generac.com/service-support/product-support-lookup
Pour le français, visiter : http://www.generac.com/service-support/product-support-lookup
SAVE THIS MANUAL FOR FUTURE REFERENCE
®

ii Automatic Transfer Switch Owner’s Manual
(000393a)
WARNING
CANCER AND REPRODUCTIVE HARM
www.P65Warnings.ca.gov.

Automatic Transfer Switch Owner’s Manual iii
Table of Contents
Section 1: Safety
Introduction ..........................................................1
Read This Manual Thoroughly ....................................1
Safety Rules .........................................................1
Electrical Hazards ................................................2
General Hazards ..................................................3
Section 2: General Information
Unpacking ............................................................5
Equipment Description .......................................5
Transfer Switch Mechanism (RXU Models Only) ........5
Utility Service Circuit Breaker ......................................6
Transfer Switch Data Decal ................................6
Transfer Switch Enclosure .................................6
Safe Use of Transfer Switch ...............................6
Load Management Options .................................6
Smart A/C Module (SACM) .........................................6
Application Considerations ..........................................7
Accessories ..........................................................8
Section 3: Installation
Introduction to Installation .................................9
Mounting ...............................................................9
Open Enclosure ...................................................9
Connecting Power Source (RBU and RXUW) .10
Connecting Alternate Power Source (RXUW
Only) ....................................................................11
Connecting Start Circuit Wires .........................13
Connecting SACM .............................................13
Control of Air Conditioner Load .................................13
Auxiliary Contact ...............................................14
Fault Current Label ............................................14
Install Transfer Switch and SACM Kit
(RBU Only) ..........................................................15
Section 4: Operation (RXUW Models Only)
Functional Tests and Adjustments .................. 17
Manual Operation .............................................. 17
Close to Utility Source Side .......................................17
Close to Generator Source Side ...............................18
Return to Utility Source Side .....................................18
Voltage Checks .................................................. 18
Utility Voltage Checks ...............................................18
Generator Voltage Checks ........................................18
Generator Tests Under Load ............................ 18
Checking Automatic Operation ........................ 19
Installation Summary ........................................ 19
Shutting Generator Down While Under Load
or During a Utility Outage ................................. 19
Preparing for Maintenance ............................... 20
Testing The SACM ............................................. 20
SACM Fuse Service ........................................... 20
Section 5: Drawings and Diagrams
Installation Drawings ........................................ 21
No. A0000258227-A: 150-200A SER METER
MAIN .........................................................................21
Interconnection Drawings ................................ 22
No. A0000258228-A (Part 1 of 2)—Liquid-Cooled
Generator ..................................................................22
No. A0000258228-A (Part 2 of 2)—Air-Cooled
Generator ..................................................................23

iv Automatic Transfer Switch Owner’s Manual
This page intentionally left blank.

Safety
Automatic Transfer Switch Owner’s Manual 1
Section 1: Safety
Introduction
Thank you for purchasing a Generac Power Systems Inc.
product. This unit has been designed to provide high
performance, efficient operation, and years of use when
maintained properly.
Read This Manual Thoroughly
If any section of this manual is not understood, contact
the nearest Independent Authorized Service Dealer
(IASD) or Generac Customer Service at 1-888-436-3722
(1-888-GENERAC), or visit www.generac.com for start-
ing, operating, and servicing procedures. The owner is
responsible for proper maintenance and safe use of the
unit.
SAVE THESE INSTRUCTIONS for future reference. This
manual contains important instructions that must be fol-
lowed during placement, operation, and maintenance of
the unit and its components. Always supply this manual
to any individual that will use this unit, and instruct them
on how to correctly start, operate, and stop the unit in
case of emergency.
Safety Rules
The manufacturer cannot anticipate every possible cir-
cumstance that might involve a hazard. The alerts in this
manual, and on tags and decals affixed to the unit, are
not all inclusive. If using a procedure, work method, or
operating technique that the manufacturer does not spe-
cifically recommend, verify that it is safe for others and
does not render the equipment unsafe.
Throughout this publication, and on tags and decals
affixed to the unit, DANGER, WARNING, CAUTION, and
NOTE blocks are used to alert personnel to special
instructions about a particular operation that may be
hazardous if performed incorrectly or carelessly. Observe
them carefully. Alert definitions are as follows:
NOTE: Notes contain additional information important to
a procedure and will be found within the regular text of
this manual.
These safety alerts cannot eliminate the hazards that
they indicate. Common sense and strict compliance with
the special instructions while performing the action or
service are essential to preventing accidents.
(000100a)
Consult Manual. Read and understand manual
completely before using product. Failure to
completely understand manual and product
could result in death or serious injury.
WARNING
(000001)
DANGER
Indicates a hazardous situation which, if not avoided,
will result in death or serious injury.
(000002)
WARNING
Indicates a hazardous situation which, if not avoided,
could result in death or serious injury.
(000003)
CAUTION
Indicates a hazardous situation which, if not avoided,
could result in minor or moderate injury.

Safety
2Automatic Transfer Switch Owner’s Manual
Electrical Hazards
(000129)
DANGER
Electrocution. High voltage is present at
transfer switch and terminals. Contact with live
terminals will result in death or serious injury.
(000104)
DANGER
Electrocution. Water contact with a power
source, if not avoided, will result in death
or serious injury.
(000145)
DANGER
Electrocution. In the event of electrical accident,
immediately shut power OFF. Use non-conductive
implements to free victim from live conductor. Apply
first aid and get medical help. Failure to do so will
result in death or serious injury.
(000237)
DANGER
Electrical backfeed. Use only approved switchgear to
isolate generator from the normal power source.
Failure to do so will result in death, serious injury,
and equipment damage.
Electrocution, equipment and property damage. Handle
transfer switches carefully when installing. Never install
a damaged transfer switch. Doing so could result in
death or serious injury, equipment and property
damage. (000195)
DANGER
(000123)
DANGER
Electrocution. Turn utility supply OFF before
working on utility connections of the transfer
switch. Failure to do so will result in death or
serious injury.
(000157)
DANGER
Electrocution. Do not disable or modify the
connection box door safety switch. Doing so
will result in death or serious injury.
(000191)
DANGER
Automatic start-up. Disconnect utility power and
render unit inoperable before working on unit.
Failure to do so will result in death or serious injury.
(000119)
DANGER
Equipment malfunction. Installing a dirty or damaged
transfer switch will cause equipment malfunction and
will result in death or serious injury.
(000155a)
WARNING
Electric shock. Only a trained and licensed electrician
should perform wiring and connections to unit. Failure to
follow proper installation requirements could result in death,
serious injury, and equipment or property damage.
(000120)
Equipment damage. Verify all conductors are tightened
to the factory specified torque value. Failure to do so
could result in damage to the switch base.
CAUTION
(000121)
Equipment damage. Perform functional tests in the
exact order they are presented in the manual.
Failure to do so could result in equipment damage.
CAUTION
(000134a)
CAUTION
Equipment damage. Exceeding rated voltage and
current will damage the auxiliary contacts. Verify
that voltage and current are within specification
before energizing this equipment.

Safety
Automatic Transfer Switch Owner’s Manual 3
General Hazards
•Competent, qualified personnel should install,
operate and service this equipment. Adhere strictly
to local, state and national electrical and building
codes. When using this equipment, comply with
regulations established by the National Electrical
Code (NEC), CSA Standard; the Occupational
Safety and Health Administration (OSHA), or the
local agency for workplace health and safety.
•If working on this equipment while standing on
metal or concrete, place insulative mats over a dry
wood platform. Work on this equipment only while
standing on such insulative mats.
•Never work on this equipment while physically or
mentally fatigued.
•Any voltage measurements should be performed
with a meter that meets UL3111 safety standards,
and meets or exceeds overvoltage class CAT III.
(000237)
DANGER
Electrical backfeed. Use only approved switchgear to
isolate generator from the normal power source.
Failure to do so will result in death, serious injury,
and equipment damage.
(000129)
DANGER
Electrocution. High voltage is present at
transfer switch and terminals. Contact with live
terminals will result in death or serious injury.
(000123)
DANGER
Electrocution. Turn utility supply OFF before
working on utility connections of the transfer
switch. Failure to do so will result in death or
serious injury.
(000104)
DANGER
Electrocution. Water contact with a power
source, if not avoided, will result in death
or serious injury.
(000188)
DANGER
Electrocution. Do not wear jewelry while
working on this equipment. Doing so will
result in death or serious injury.
(000213)
DANGER
Electrocution. Only authorized personnel should
access transfer switch interior. Transfer switch
doors should be kept closed and locked. Failure to
do so will result in death or serious injury.
(000191)
DANGER
Automatic start-up. Disconnect utility power and
render unit inoperable before working on unit.
Failure to do so will result in death or serious injury.
(000145)
DANGER
Electrocution. In the event of electrical accident,
immediately shut power OFF. Use non-conductive
implements to free victim from live conductor. Apply
first aid and get medical help. Failure to do so will
result in death or serious injury.
(000209b)
WARNING
Loss of life. This product is not intended to
be used in a critical life support application.
Failure to adhere to this warning could result
in death or serious injury.
(000247a)
Equipment damage. This unit is not intended for use as a prime
power source. It is intended for use as an intermediate power
supply in the event of temporary power outage only. Doing so
could result in death, serious injury, and equipment damage.
WARNING

Safety
4Automatic Transfer Switch Owner’s Manual
This page intentionally left blank.

General Information
Automatic Transfer Switch Owner’s Manual 5
Section 2: General Information
Unpacking
Carefully unpack the transfer switch. Inspect closely for
any damage that might have occurred during shipment.
The purchaser must file with the carrier any claims for
loss or damage incurred while in transit.
Verify all packing material is completely removed from
the switch prior to installation.
Equipment Description
This automatic transfer switch is used for transferring
electrical load from a utility (normal) power source to a
generator (standby) power source. Transfer of electrical
loads occurs automatically when the utility power source
has failed or is substantially reduced and the generator
source voltage and frequency have reached an
acceptable level. The transfer switch prevents electrical
feedback between two different power sources (such as
the utility and generator sources) and, for that reason,
codes require it in all standby electric system installations.
The transfer switch consists of a transfer mechanism,
utility service disconnect circuit breaker (if equipped), and
a Smart A/C module incorporating fuses and two terminal
blocks for transfer switch connections.
This transfer switch is equipped with a separately
accessible Utility Entry cabinet which houses a standard
4 Jaw Meter Socket. It is provided with a means for the
Electrical Utility provider to lock. An optional 5th Jaw Kit
is available if required.
The lower cabinet contains the Automatic Transfer
Switch and Service Disconnect Main Circuit Breaker with
Load Shed Module and customer terminations. RBU
Models do not come equipped with a transfer switch.
They may be upgraded to include a transfer switch with
G0074000 Upgrade Kit.
NOTE: Meters are retained by either a Ring or Ringless
method. Verify you have the proper type to meet local
code requirements.
Transfer Switch Mechanism (RXU Models Only)
See Figure 2-1. This switch is used with a single-phase
system when the single-phase neutral line is to be
connected to a neutral lug and is not to be switched.
Solderless, screw-type terminal lugs are standard.
The conductor size range of the 4 Jaw Meter Socket is as
follows:
This transfer switch is suitable for control of motors, electric
discharge lamps, tungsten filament and electric heating
equipment where the sum of motor full load ampere ratings
and the ampere ratings of other loads do not exceed the
ampere rating of the switch and the tungsten load does not
exceed 30 percent of the switch rating.
This ETL listed transfer switch is for use in optional
standby systems only (NEC article 702).
A 150A or 200A rated switch is suitable for use on a
circuit capable of 22,000 RMS symmetrical amperes, 240
VAC when protected by a circuit breaker without an
adjustable short time response or by fuses.
Figure 2-1. Typical Single-Phase ATS Transfer
Mechanism
Switch
Rating Wire Range Conductor Tightening Torque
150/200A #6-250 MCM (Cu/Al) 275 in-lbs (31 Nm)
A Utility Closing Coil
B Generator Closing Coil
C Utility Lugs (N1 & N2)
D Generator Lugs (E1 & E2)
E Load Lugs (T1 & T2)
000219
A
B
C
D
E

General Information
6Automatic Transfer Switch Owner’s Manual
Utility Service Circuit Breaker
The utility service circuit breakers for 150/200 amp
models are:
•Type 225AF, 2-pole
•22,000 A/C
•120/240VAC, 150A/200A
•50/60 Hertz
Transfer Switch Data Decal
A data decal is permanently affixed to the transfer switch
enclosure. Use this transfer switch only with the specific
limits shown on the data decal and on other decals and
labels that may be affixed to the switch. This will prevent
damage to equipment and property.
When requesting information or ordering parts for this
equipment, make sure to include all information from the
data decal.
For future reference, record the Model and Serial
numbers in the space provided on the front cover of this
manual.
Transfer Switch Enclosure
The standard switch enclosure is a National Electrical
Manufacturer’s Association (NEMA) and 3R type. ETL
and NEMA 3R (indoor/outdoor rated) type enclosures
primarily provide a degree of protection against falling
rain and sleet; are undamaged by the formation of ice on
the enclosure.
Safe Use of Transfer Switch
Before installing, operating or servicing this equipment,
read the Safety Rules carefully. Comply strictly with all
Safety Rules to prevent accidents and/or damage to the
equipment. The manufacturer recommends that a copy
of the Safety Rules be posted near the transfer switch.
Also, be sure to read all instructions and information
found on tags, labels and decals affixed to the
equipment.
Publications that outline the safe use of transfer switches
are the following:
•NFPA 70; National Electrical Code
•UL 1008: Standard for Safety—Automatic Transfer
Switches
•ANSI/UL 414 Meter Sockets
•UL 891 (Busbar)
•ANSI C12.7 Meter Sockets
NOTE: It is essential to use the latest version of any
standard to guarantee correct and current information.
Load Management Options
Load management systems are designed to work
together to prevent a generator from being overloaded by
large appliance loads. A Smart A/C Module (SACM) is
provided as standard equipment with this switch. An
optional Smart Management Module (SMM) is also
available.
Smart A/C Module (SACM)
Up to four air conditioner loads can be managed by the
SACM. The SACM manages the loads by “shedding” the
connected loads in the event of a drop in generator
frequency (overload). Loads to be “shed” are in 4 priority
levels on the module.
See Figure 2-2. Priorities A/C 1-4 (A) have connections
for an air conditioner. To control an air conditioner, no
additional equipment is required. Internal normally closed
relays interrupt the 24 VAC thermostat control signal to
disable the air conditioner load.
Four LEDs, located on the SACM (B), illuminate when a
load is connected and powered.
(000100a)
Consult Manual. Read and understand manual
completely before using product. Failure to
completely understand manual and product
could result in death or serious injury.
WARNING

General Information
Automatic Transfer Switch Owner’s Manual 7
See Figure 2-2. The SACM has a test button (C) used to
simulate an overload condition. This button operates
even when the transfer signal is inactive. The Generator
Control Wiring is connected to terminals (D).
Figure 2-2. Smart A/C Module (SACM)
Application Considerations
Generator overload condition is determined by generator
frequency. Loads are shed when frequency is less than
58 Hz for three seconds or less than 50 Hz for ½ second
(for 60 Hz systems).
The SACM can be used in conjunction with individual
SMMs to manage a combined total of eight loads.
•Use Priorities A/C 1-4 on the SACM as the top
priorities, then up to four SMMs as Priorities 5-8.
•Use only select A/C priorities on the SACM as the top
priorities, then use additional SMMs as the remaining
priorities.
•A SMM can share a priority with an A/C priority on
the SACM provided the generator is sized to handle
the combined surge load from both appliances.
Sharing priorities can allow up to 12 loads to be
managed in a properly sized system.
In any combination of modules, the recovery times after a
loss of utility power or shutdown due to overload are
shown in Table 1.
See the SMM Owner’s/Installation Manual for detailed
characteristics and specifications of that product.
T1
1
1
1
1
2
2
2
2
T1N1N2
0 DC GROUND
194 +12 VDC
N1
N2
T1
23 TRANSFER
®
®
A
B
C
D
006783
Table 1. Priority Settings
Priority Recovery Time SACM SSMM
1 5 minutes Yes Yes
2 5 minutes 15 seconds Yes Yes
3 5 minutes 30 seconds Yes Yes
4 5 minutes 45 seconds Yes Yes
5 6 minutes NA Yes
6 6 minutes 15 seconds NA Yes
7 6 minutes 30 seconds NA Yes
8 6 minutes 45 seconds NA Yes

General Information
8Automatic Transfer Switch Owner’s Manual
Accessories
Accessory Description
G0074000
RBU Transfer Switch Upgrade Kit
Includes all pieces to perform conversion of a RBU Meter Main into a RXUW Transfer
Switch.
G0074010
Ring Style Meter Cover
Replacement outer top cover and sealing ring for ring style meter retainment.
Verify you have the proper type to meet local code requirements.
G0074020
Fifth Jaw Metering Kit
Includes all pieces necessary to perform conversion of the standard Four Jaw Meter Socket
into a Five Jaw Meter Socket.
Verify you have the proper type to meet local code requirements.
G0074030
Horn Bypass Meter Jaws
Replacement meter jaws for horn bypass type meter sockets. Verify you have the proper
type to meet local code requirements.
G0074040
Meter Safety Flash Shield
Safety flash shield for standard and horn bypass type meter jaws. Used with ring-less style
meter retainment.
G0074050
Side Connection Lug Kit
Includes all pieces necessary to convert the standard four jaw meter socket into a socket
with side lug line connections.
G0074060
24 in. Pedestal Extension Kit
Includes all pieces to extend the transfer switch enclosure by 24 in. for underground service
feed.
G0074070
48 in. Pedestal Extension Kit
Includes all pieces to extend the transfer switch enclosure by 48 in. for underground service
feed.
A0000018981
Ultrasonic Cleaner Solution
Cleaning solution safe for metal and plastic surfaces. Contains 1 gal (128 oz).
A0000019001
Corrosion Inhibitor and Protectant
Protectant for outdoor plastic, rubber, leather and vinyl surfaces. Contains 0.12 gal (15 oz).

Installation
Automatic Transfer Switch Owner’s Manual 9
Section 3: Installation
Introduction to Installation
This equipment has been wired and tested at the factory.
Installing the switch includes the following procedures:
•Mounting the enclosure.
•Connecting power source and load leads.
•Connecting the generator start and sensing circuit.
•Connecting any auxiliary contact (if needed).
•Testing functions.
Mounting
Mounting dimensions for the transfer switch enclosure
are in this manual. Enclosures are typically wall-
mounted. See Drawings and Diagrams.
This transfer switch is mounted in a ETL type 3R
enclosure. It can be mounted outside or inside and should
be based on the layout of installation, convenience and
proximity to the utility supply and load center.
Install the transfer switch as close as possible to the
electrical loads that are to be connected to it. Mount the
switch vertically to a rigid supporting structure. To prevent
switch distortion, level all mounting points. If necessary,
use washers behind mounting holes to level the unit.
Open Enclosure
See Figure 3-1. First, remove outer top cover (A):
1. Rotate latch (B) clockwise until clear of latch hole.
Figure 3-1. Rotate Latch
2. See Figure 3-2. Tilt cover as shown and pull away
from enclosure.
Figure 3-2. Tilt Cover
See Figure 3-3. Remove outer bottom cover (C):
3. Remove thumb screw (D).
4. Slide slot (E) over retention tab.
5. Lower cover until clear of flange (F), and pull away
from enclosure.
Remove inner panel (G):
6. Loosen nut (H) until it clears t-slot (I) in inner panel.
7. Grasp inner panel at two cutouts (J—left and right).
Tilt inner panel as shown, passing nut through t-
slot.
8. Lower inner panel until clear of two retention slots
(K—left and right sides), and pull away from
enclosure.
(000119)
DANGER
Equipment malfunction. Installing a dirty or damaged
transfer switch will cause equipment malfunction and
will result in death or serious injury.
A
B
010086
010087

Installation
10 Automatic Transfer Switch Owner’s Manual
Figure 3-3. Remove Bottom Cover and Panel
Connecting Power Source (RBU and
RXUW)
Installation and interconnection diagrams are provided in
this manual.
NOTE: All installations must comply with national, state
and local codes. It is the responsibility of the installer to
perform an installation that will pass the final electrical
inspection.
1. Select the upper or one of the lower utility cable
entry points. Should the lower utility entry point
need the utility wire duct relocated to the opposite
side, do so now. The duct is designed to be
installed on either side.
2. See Figure 3-4. Connect utility supply at the Four
Jaw Meter Socket terminals N1 and N2. Follow
torque specifications listed on the circuit breaker.
Available utility entry points are the top, the bottom
left or the bottom right. The wire duct is reversible
for left or right wire entry applications as needed.
3. Connect utility neutral and ground to the Upper
Neutral and Ground terminals. Neutral and Ground
terminals are bonded to each other with a jumper
wire (A).
4. If applicable, connect Solar directly to Utility at S1
and S2 with Lugs provided on bus under circuit
breaker cover as local codes permit.
5. Utility authorized personnel may install the meter
into the meter socket. The Upper Utility Access
Panel may now be installed and "sealed" as
required by local utility.
NOTE: Neutral to Ground jumper wire (A) is
provided for use if required by local codes.
C
D
E
F
G
H
I
J
K
010088
(000116)
DANGER
Electrocution. Turn utility and emergency
power supplies to OFF before connecting
power source and load lines. Failure to do so
will result in death or serious injury.

Installation
Automatic Transfer Switch Owner’s Manual 11
Connecting Alternate Power Source
(RXUW Only)
1. See Figure 3-4. Connect generator to the
generator terminals (E1 and E2) on the transfer
mechanism.
2. Connect the generator neutral wire to the lower
neutral lug.
IMPORTANT NOTE: A jumper wire (B) bonds
the upper and lower Neutral lugs. NEVER
remove this wire.
3. Connect a subpanel supply to lower T1 and T2
Terminals. Connect subpanel Neutral and Ground
to lower Neutral and Ground bars.
Conductor sizes must be adequate to handle the
maximum current to which they will be subjected, based
on the 75 °C column of tables, charts, etc. used to size
conductors. The installation must comply fully with all
applicable codes, standards and regulations.
Knockouts into the transfer switch can be made in the
field as needed for entry of power cables and conduit.
Conduit entry shall maintain the proper wire bending
spaces required by Tables 312.6 (A) and (B) in the NEC.
Conduits should be arranged to provide separation
between the Utility and Generator supply conductors
inside the enclosure.
For transfer switches installed in wet locations, power
cables or conduits entering above the level of
uninsulated live parts shall use fittings listed for use in
wet locations as required by 312.2 in the NEC.
NOTE: If aluminum conductors are used, apply corrosion
inhibitor to conductors. After tightening terminal lugs,
carefully wipe away any excess corrosion inhibitor.
Figure 3-4. Wiring Connections
Tighten terminal lugs to the torque values as noted on the
decal located on the inside of the door. After tightening
terminal lugs, carefully wipe away any excess corrosion
inhibitor.
N1
N2
E1
E2
T1
T2
A
010089
B
S1
S2
(000120)
Equipment damage. Verify all conductors are tightened
to the factory specified torque value. Failure to do so
could result in damage to the switch base.
CAUTION

Installation
12 Automatic Transfer Switch Owner’s Manual
Figure 3-5. Typical SACM Connections
A
Thermostat 1
B
Air Conditioner 1
C
Thermostat 2
D
Air Conditioner 2
E
Thermostat 3
F
Air Conditioner 3
G
Thermostat 4
H
Air Conditioner 4
T1 (fused)
Battery Charge
N1 (fused)
Utility Sense
N2 (fused)
Utility Sense
0 DC
Ground
194
+ 12 VDC
23
Transfer Control
J
240 VAC, 6.3A
Fuses
K
Spare Fuse
A
B
G
H
C
D
E
F
T1
1
1
1
1
2
2
2
2
T1N1N2
0 DC GROUND
194 +12 VDC
N1
N2
T1
23 TRANSFER
®
®
T1
N2
0
194
23
N1
006244
J
K

Installation
Automatic Transfer Switch Owner’s Manual 13
Connecting Start Circuit Wires
Control system interconnections consist of N1, N2, and
T1, and leads 23, 0, and 194 (see Figure 3-5).
NOTE: Generac Type TC-ER-JP power and control tray
cable can be installed as permitted by the 2017 NEC.
Type TC-ER-JP cable contains color-coded power and
control conductors.
The generator control wiring is a Class 1 signaling circuit.
Reference instruction manual of specific engine
generator for wiring connection details. Screw heads are
straight bladed and cross-bladed, and should be
tightened to 3.5 in-lb (0.4 Nm).
Recommended wire gauge sizes depend on wire length
as specified in the following chart: Consult factory if you
are operating more than one transfer switch and SACM.
Exception: Conductors of AC and DC circuits, rated
1000 volts nominal, or less, shall be permitted to occupy
the same equipment, cable, or conduit. All conductors
shall have an insulation rating equal to at least the
maximum circuit voltage applied to any conductor within
the equipment, cable, or conduit. See NEC 300.3(C)(1).
Connecting SACM
See Figure 3-5. The SACM can control an air conditioner
(24 VAC) directly.
Control of Air Conditioner Load
1. Route the thermostat cable (from the furnace/
thermostat to the outdoor air conditioner unit) to the
transfer switch.
2. Connect the wire to the terminal strip terminals
(A/C 1) on the SACM as shown in Figure 3-5.
These are normally closed contacts which open
upon load shed conditions. Route thermostat wire
away from high voltage wires.
3. If required, connect additional air conditioners to
the terminal strip terminals (A/C 2-4).
NOTE: These instructions are for a typical air conditioner
installation. Control of certain heat pumps and 2-stage air
conditioners may require special connections or the use
of SMMs to control the loads.
Recommended
Wire Size
Maximum Wire Length
( O n e t r a n s f e r s w i t c h
and load shed module)
No. 18 AWG 1–115 ft (0.3–35 m)
No. 16 AWG 116–185 ft (36–56 m)
No. 14 AWG 186–295 ft (57–89 m)
No. 12 AWG 296–460 ft (90–140 m)
Contact Ratings
A/C 1-4 24 VAC, 1.0 Amp Max

Installation
14 Automatic Transfer Switch Owner’s Manual
Auxiliary Contact
See Figure 3-6 . If desired, there is one normally-closed
Auxiliary Contact (A) on the transfer switch to operate
customer accessories, remote advisory lights, or remote
annunciator devices. A suitable power source must be
connected to the common terminal. If needed, an extra
auxiliary contact can be added.
Figure 3-6. Auxiliary Contact
The auxiliary contact is normally closed when the transfer
switch is in utility mode. The contacts will open when the
transfer switch is in the standby power mode.
NOTE: Auxiliary Contact is rated 10 amps at 125 or 250
volts AC, and 0.6 amps at 125 volts DC.
Fault Current Label
See Figure 3-7 . A Fault Current Identification Label is
provided in the bag containing the unit Owner’s Manual and
transfer switch manual operating handle. The 2017 NEC
requires that the short-circuit current rating of the transfer
equipment, based on the type of overcurrent protective
device protecting the transfer equipment, be field marked on
the exterior of the transfer equipment. For NEC compliance,
verify the required short-circuit current rating of the transfer
switch before installation.The completed label provides the
local AHJ (Authority Having Jurisdiction) with the information
he or she may require during inspection.
Apply the label to the exterior of the transfer switch
enclosure. Use a pen to fill in the required information, and
then cover the label with the clear protective decal.
Contact
your system administrator for more information.
Figure 3-7. Fault Current Label
A
003626
(000134a)
CAUTION
Equipment damage. Exceeding rated voltage and
current will damage the auxiliary contacts. Verify
that voltage and current are within specification
before energizing this equipment.
004496

Installation
Automatic Transfer Switch Owner’s Manual 15
Install Transfer Switch and SACM Kit
(RBU Only)
1. See Figure 3-8 . Remove screws (A) from bus bar
assembly and set aside.
2. Remove screws (B) from bus bar assembly and
remove assembly from sub panel.
Figure 3-8. Remove Bus Bar Assembly
3.
See Figure 3-9 . Use provided M5 screws (C) to
install transfer switch assembly from kit G0074000.
4. Install screws (A) from step 1 and tighten to 72 in-
lbs onto circuit breaker.
5. Install SACM unit from kit G074000 into bracket
provided (D).
6. Plug harness with 8 pin connector into SACM unit
(D).
7. Follow RXUW instructions to connect SACM to
genset.
Figure 3-9. Install Kit G0074000
A
B
010495
A
C
D
010496

Installation
16 Automatic Transfer Switch Owner’s Manual
This page intentionally left blank.