ITEMS YOU MUST PURCHASE
12. MOUNTING OF AUTOMATIC TRANSFER SWITCH
Locate automatic transfer switch with built-in emergency load
center within one foot of main distribution panel. The automatic
transfer switch with built-in load center can be located to the
left or right of main distribution panel. Hold transfer switch
against the mounting surface. Level the transfer switch and
mark the mounting holes. Drill the appropriate size pilot holes.
Mount automatic transfer switch with built-in load center to
mounting surface with appropriate fasteners.
13a. CONNECTION OF EMERGENCY CIRCUITS
Remove the main electrical distribution panel cover. Remove
appropriate size knockout from the bottom or side of the main
panel. (A 2-foot flexible conduit is pre-wired from the transfer
switch with built-in load center.) Remove threaded lock nut
from conduit coupling. Feed all wires through knockout into
main panel. Slip lock nut over wires and tighten securely on
conduit coupling. Remove the black (hot) wire from a circuit
breaker that protects a circuit you want to have powered in the
event of a power failure.
Wire nut the black wire to the matching circuit lead wire from
the emergency circuit breaker from load center in the transfer
switch. (All circuit wires are color coded and labeled for easy
identification). Repeat this process with remaining circuits to
be powered by the generator. White wires (neutral) in your main
distribution panel should remain connected to neutral bar. It is
not necessary to move them. The emergency load center in the
transfer switch supplies the following circuits: Model 4389 (5)
15A 120V, (1) 20A 120V and (1) 30A 240V. Model 4456 (3)
15A 120V, (3) 20A 120V, (1) 20A 240V & (1) 30A 240V.
Model
4390 will include (2) additional 15A 120V circuits.
4
7
Visit Municipal Office
• Battery - Automotive type group 26/26R negative
ground 350CCA (Model 4389) or 550CCA (Models
4456 and 4390) minimum capacity
• 40 Amp (Model 4389) or 70 Amp (Models 4456 and
4390) double pole circuit breaker (Must be
compatible with your main electrical distribution
panel.)
• Grounding rod with grounding strap
• Crushed stone or pea gravel (approximately 10-12
cubic feet)
• Black poly-film or other vegetation blocking fabric
(5-1/2' x 5')
• Silicone caulk
• Pipe sealant (suitable for gaseous fuel
connections)
• Fasteners (to mount external connection box and
automatic transfer switch with built-in emergency
load center)
1
Connection of Emergency Circuits
13a
Install Automatic Transfer Switch
12
1ft.
Connection of Emergency Circuits
13a
Fuel Connection
3
Note: Circuits to be moved must be protected by same
size breaker. For example, a 15 amp circuit in main
panel must be 15 amp circuit in transfer switch.
DANGER: Although you may choose to perform
electrical connections yourself, Generac Power
Systems, Inc. recommends that a licensed electrician
or individual with complete knowledge of electricity
perform the procedures in sections 12, (above) 13a, and
13b.
DANGER: Switch service
main circuit breaker to “off”
or open position prior to
removal of cover or removal
of any wiring of the main
electrical distribution panel.
The wires connected to the
service main circuit breaker remain live or “hot”. Avoid
contact with these wires and the service main circuit
breaker connection lugs.
NOTE: Balance must be maintained when moving
circuit locations from main electrical distribution panel
to emergency load center. Circuit breaker positions
alternate buss bars vertically. Circuits sharing a neutral
wire should either be moved together to adjacent
positions in emergency load center or not moved. If
you are unsure of proper procedure or if your
installation differs from that described in this guide,
consult a licensed professional at this time.
PLEASE READ ENTIRE GUIDE BEFORE STARTING THE INSTALLATION
PROCESS TO BE AWARE OF ALL REQUIREMENTS.
TOOLS REQUIRED:
Drill, Drill Bits, Hole Saw (type and length will be determined by the materials you will be drilling
and cutting), Open-End Wrenches or Adjustable Wrenches, Socket Wrenches or Nut Drivers, Standard and Phillips
Screwdrivers, Level, Sledge Hammer, Channel-lock Pliers, Spade Shovel, and Safety Goggles.
1.
It will be necessary to pay a visit to your local
municipal offices to apply for a building permit.
Building permits are necessary to ensure proper
installation, safety and adherence to all local
building code specifications. The location and
phone number can be found in the government
section of your local phonebook.
2.
PLAN THE LOCATION OF YOUR GENERATOR.
Note: Do not place the generator directly under
a window.
Select an area outside of your home nearest your
incoming gas service.
3.
Arrange for installation of rigid gas piping (per local
code specifications) to the location where you
intend to position your generator. Fuel piping
should include a fuel shut off valve. Optimally, the
termination of the rigid piping should be within 8-
10” inches of the fuel inlet of the generator.
