Generac Power Systems GenTran 6333 Instruction sheet

Installation Guidelines
For
SE-Rated Single Load Manual
Transfer Switches 6333 / 6334
This manual should remain with the unit.
This manual must be used in conjunction
with the appropriate owner’s manual.
*NOT INTENDED FOR USE IN CRITICAL
LIFE SUPPORT APPLICATIONS.
*ONLY QUALIFIED ELECTRICIANS OR
CONTRACTORS SHOULD ATTEMPT
INSTALLATION!

ii Transfer Switch Installation Guidelines
Forward
Thank you for purchasing a Generac Single Load Manual Transfer Switch to safely connect a portable generator to your
home or business (single phase only), recommended to be used as the disconnect panel for a single 120/240VAC load or to
feed a subpanel for multiple loads, see Installation Diagrams for typical installations. Use where the main electrical panel is
located indoors. This product is suitable for service entrance equipment.
READ THIS MANUAL THOROUGHLY. This manual has been prepared to familiarize personnel involved with the
installation of transfer switches with the manufacturer’s installation requirements. Information and instructions con-
tained herein are not intended to replace or supersede, local, state, or national safety, electrical, and building codes
pertaining to such installations. Applicable laws, codes, and standards must always take precedence over the recom-
mendations contained herein. Always check with the local Authority Having Jurisdiction (AHJ) for the codes or stan-
dards that apply.
Only authorized dealers or qualified, competent installation contractors or electricians thoroughly familiar with applica-
ble codes, standards, and regulations should install this standby electric power system. The installation must be in strict
compliance with all codes, standards, and regulations.
It is not intended that this manual be used by any unqualified person for the purpose of installing a transfer switch.
Installation, inspection, and testing of the system must be attempted only by competent, qualified electricians or instal-
lation contractors who are familiar with the equipment and with all installation codes and requirements.
It would be impossible to provide details for every installation configuration. For this reason, much of the information in
this manual is general in nature. Illustrations of typical installations are not intended to serve as specific installation
plans, but may be used in the planning and design process when considering the selection and purchase of a genera-
tor set for standby power applications. Always have the unit specific drawings and manuals on hand before beginning
any installation.
If a portable generator is used to power electrical load circuits normally powered by a utility
power source, it is required by code to install a transfer switch. The transfer switch must
effectively isolate the electrical system from the utility distribution system when the generator
is operating. Failure to isolate an electrical system by such means may result in damage to the
generator and may also result in injury or even death to utility power workers due to backfeed
of electrical energy.
After the transfer switch has been installed, do nothing that might render the installation in non-
compliance with such codes, standards, and regulations. Every effort was made to ensure that
the information in this manual was both accurate and complete at the time it was released.
However, the manufacturer reserves the right to change, alter, or otherwise improve this product
at any time without notice.
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WARNING!
California Proposition 65
Engine exhaust and some of its constituents are known to the state of California to cause cancer,
birth defects, and other reproductive harm.
WARNING!
California Proposition 65
This product contains or emits chemicals known to the state of California to cause cancer,
birth defects, and other reproductive harm.

Transfer Switch Installation Guidelines iii
Section 1 Safety
1.1 Introduction .......................................................................................................................... 1
1.2 Safety Rules .......................................................................................................................... 1
1.3 General Hazards ................................................................................................................... 2
1.4 Electrical Hazards ................................................................................................................ 2
1.5 Fire Hazards .......................................................................................................................... 3
1.6 Explosion Hazards ............................................................................................................... 3
1.7 Standards Index ................................................................................................................... 3
Section 2 Installation
2.1 Contents................................................................................................................................. 5
2.2 Required Tools ...................................................................................................................... 5
2.2.1 Tools and Items Needed for Installation...................................................................... 5
2.2.2 Optional Items for Installation
2.3 Specifications ........................................................................................................................ 5
2.4 Transfer Switch Installation ................................................................................................ 6
2.5 Wiring Diagram ..................................................................................................................... 6
Section 3 Operation
3.1 Transferring from Utility Power to Generator Power ........................................................ 7
3.2 Transferring from Generator Power to Utility Power ......................................................... 7
Table of Contents
Forward ....................................................................................................................ii

Table of Contents
iv Transfer Switch Installation Guidelines
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Transfer Switch Installation Guidelines 1
Section 1 Safety
1.1 — Introduction
Thank you for purchasing a Generac Single Load Manual Transfer Switch to safely connect a portable generator to your
home or business (single phase only), recommended to be used as the disconnect panel for a single 120/240VAC load or to
feed a subpanel for multiple loads, see Installation Diagrams for typical installations. Use where the main electrical panel is
located indoors. This product is suitable for service entrance equipment
Read this manual thoroughly.If any portion is not understood, contact the nearest Authorized Generac Service
Dealer for clarification. These individuals are trained/qualified service technicians familiar with the control systems and
available options, and also have full access to drawings, publications, and other information required for a successful
installation.
1.2 — Safety Rules
Throughout this publication, DANGER, WARNING, CAUTION, and NOTE boxes are used to alert personnel to special
instructions about a particular operation that may be hazardous if performed incorrectly or carelessly. Observe them
carefully. They indicate:
Indicates a hazardous situation or action that, if not avoided, will result in death or serious
injury.
Indicates a hazardous situation or action that, if not avoided, could result in death or seri-
ous injury.
Indicates a hazardous situation or action that, if not avoided, could result in minor or mod-
erate injury.
NOTE: Notes provide additional information important to a procedure or component.
These safety warnings cannot eliminate the hazards they indicate. Observing safety precautions and strict compliance
with the special instructions while performing the action or service are essential to preventing accidents.
Four commonly used safety symbols accompany DANGER, WARNING, and CAUTION boxes and the type of informa-
tion each indicates:
This symbol points out important safety information that, if not followed, could
endanger personnel and/or property.
This symbol represents the potential for an Explosion Hazard.
This symbol represents the potential for a Fire Hazard.
This symbol represents the potential for an Electrical Shock Hazard.
SAVE THESE INSTRUCTIONS. This manual contains important instructions that should be
followed during installation of the transfer switch. The manufacturer suggests that these
safety rules be copied and posted in potential hazard areas. Safety should be stressed
to all installers, operators, potential operators, and service and repair technicians for
this equipment.
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Safety
2Transfer Switch Installation Guidelines
The manufacturer cannot anticipate every possible circumstance that might involve a hazard. The warnings 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 the manufacturer does not specifically recommend, ensure that it is safe for others. Also make sure the pro-
cedure, work method, or operating technique used does not result in unsafe conditions.
1.3 — General Hazards
•For safety reasons, the manufacturer recommends that this equipment be installed, serviced, and repaired by an
Authorized Service Dealer or other competent, qualified electrician or installation technician who is familiar with
all applicable codes, standards, and regulations.
•Ensure that the transfer switch is installed, operated, and serviced in accordance with the manufacturer’s instruc-
tions and recommendations. Following installation, do nothing that might render the unit unsafe or in noncompli-
ance.
•Keep the area around the transfer switch clean and uncluttered. Remove any materials that could become haz-
ardous.
•When working on this equipment, remain alert at all times. Never work on the equipment when physically or men-
tally fatigued.
•Inspect the portable generator regularly, and promptly repair or replace any worn or damaged components using
only factory approved parts and procedures.
1.4 — Electrical Hazards
•All generators produce dangerous electrical voltages and can cause fatal electrical shock. Utility power delivers
extremely high and dangerous voltages to the transfer switch as well as the generator when it is in operation.
Avoid contact with bare wires, terminals and other connections. Ensure all covers, guards, and barriers are in
place, and that they are properly secured and/or locked before operation. If work must be done around an oper-
ating unit, stand on an insulated, dry surface to reduce potential shock hazard.
•Do not handle any kind of electrical device while standing in water, while barefoot, or while hands or feet are wet.
DANGEROUS ELECTRICAL SHOCK MAY RESULT.
•If it is necessary to stand on metal or concrete while installing, operating, servicing, or repairing this equipment,
lay down a dry wooden platform and cover with insulated mats before beginning.
•Verify that the portable generator is properly grounded.
•Wire gauge sizes of electrical wiring, cables, and cord sets must be adequate to handle the maximum electrical
current (ampacity) to which it will be subjected.
•Before installing or servicing equipment, verify that all power voltage supplies are positively turned off at their
sources. Failure to do so can result in hazardous and possibly fatal electrical shock.
•Connecting a portable generator to an electrical system normally supplied by an electric utility is by means of the
transfer switch so as to isolate the generator’s electric system from the electric utility distribution system when
the portable generator is operating. Failure to isolate the two electric system power sources from each other by
such means will result in damage to the portable generator and may also result in injury or death to utility power
workers due to backfeed of electrical energy.
•In case of accident caused by electric shock, immediately shut down the source of electrical power. If this is not
possible, attempt to free the victim from the live conductor. AVOID DIRECT CONTACT WITH THE VICTIM. Use
a nonconducting implement, such as a dry rope or board, to free the victim from the live conductor. If the victim is
unconscious, apply first aid and get immediate medical help.
•Do not wear jewelry when working on this equipment. Jewelry can conduct electricity resulting in electric shock,
or may get caught in moving parts resulting in injury.

Safety
Transfer Switch Installation Guidelines 3
1.5 — Fire Hazards
•Keep a fire extinguisher near the portable generator and transfer switch at all times. Keep the extinguisher prop-
erly charged and be familiar with its use. Direct any questions to the local fire department.
NOTE: DO NOT use any carbon tetra-chloride type fire extinguishers. These fire extinguishers emit toxic fumes
and the liquid can damage wiring insulation.
1.6 — Explosion Hazards
•Do not smoke around the generator. Immediately wipe up any fuel or oil spills. Ensure that no combustible mate-
rials are left in the generator compartment, or on or near the generator, as FIRE or EXPLOSION may result.
Keep the area surrounding the generator clean and free of debris.
•All types of fuels are potentially FLAMMABLE and/or EXPLOSIVE and must be handled with care. Inspect the
fuel system frequently and correct any leaks immediately. Be sure fuel supply lines are properly installed, purged,
and leak tested before placing the generator set into service.
1.7 — Standards Index
Be sure the transfer switch is in strict compliance with all applicable local, state, and federal laws, codes, and regula-
tions pertaining to such installations. Always use the current version or edition of the applicable law, code, and regula-
tion as it applies to the local jurisdiction.

Safety
4Transfer Switch Installation Guidelines
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Transfer Switch Installation Guidelines 5
Section 2 Installation
2.1 — Contents
What is Included in this Carton:
• Manual Transfer Switch with Utility and Generator main breakers mechanically interlocked preventing utility and
generator from powering the load at the same time
• Hardware Kit (including Bonding Screw and Label to convert switch to Service Entrance rating)
• Documentation: Installation Manual and Product Registration card
2.2 — Required Tools
2.2.1— Tools and Items Needed for Installation:
• Safety eye goggles
• 1/4” and 11/32” nut drivers
• Straight blade and Phillips screwdriver
• Electric drill and drill bits
• Wire cutter/stripper
• NEW 2-pole, 60 Amp or 100 Amp 125/250V circuit breaker to install in main load center (see Table 1) manufactured by
same as main load center
• Appropriately sized conduit, fittings, lock nuts and wire
• Anchors and screws to mount transfer switch to wall
2.2.2— Optional Items for Installation:
• Power Inlet Box that mounts outside for convenient generator connection to transfer switch
• Power Cord to connect generator to transfer switch via the power inlet box
2.3 — Specifications
Table 1: SPECIFICATIONS
Model 6333 6334
Max Generator Size in Watts (continuous) 15000 watts 25000 watts
UTILITY MAIN breaker, 1 Included, 1 additional
required
60 Amp 100 Amp
GEN MAIN breaker, included 60 Amp 100 Amp
NEMA Type Enclosure NEMA 1 NEMA 1
Max 1-pole Circuits / Max 2-pole Circuits NO PROVISION FOR BRANCH
CIRCUIT
NO PROVISION FOR BRANCH
CIRCUIT

Installation
6Transfer Switch Installation Guidelines
HAZARDOUS VOLTAGES ARE PRESENT INSIDE TRANSFER SWITCH ENCLOSURES THAT CAN CAUSE DEATH
OR SEVERE PERSONAL INJURY. FOLLOW PROPER INSTALLATION, OPERATION AND MAINTENANCE PROCE-
DURES TO AVOID HAZARDOUS VOLTAGES.
TURN OFF THE MAIN CIRCUIT BREAKER IN THE LOAD CENTER BEFORE STARTING INSTALLATION.
2.4 — Installation Procedure
1. Transfer switch can be installed on either the left or right side of the main load center. Transfer switch is pro-
vided with 1/2” to 1-1/2” knockouts (KOs) to connect to the main load center and Power Inlet Box using
installer-provided conduit, fittings and wire. The conduit should enter the main load center in one of the bottom
or lower side KOs. If Service Entrance rating is desired, installer must install bonding screw in Hardware Kit
(included) to neutral bar and must apply the Service Disconnect label to the transfer switch as part of the instal-
lation procedure.
2. Remove covers from the main load center and transfer switch. Cut conduit to desired length. Attach fittings to
the conduit and fittings/conduit assembly to both enclosures through the KOs with locknuts. Hold the transfer
switch away from the load center against the wall on which it is to be mounted and mark the holes on the wall
for the anchoring screws. Mount transfer switch to wall with anchors and screws (provided by installer).
3. You are ready to terminate the wires in the manual transfer switch and load center. Install (installer provided)
60A or 100A 2P UTILITY MAIN circuit breaker in main load center. Pull appropriately sized wire (provided by
installer) through conduit and connect RED and/or BLACK wire between the 2-Pole UTILITY circuit breaker in
the transfer switch and the newly installed UTILITY circuit breaker in the main load center, WHITE wire to the
neutral bar inside the transfer switch and main load center, and GREEN wire to the ground bar in transfer
switch and main load center. If there is no separate ground bar in the main load center, connect GREEN wire
into an open position in the NEUTRAL bar in the main load center, and tighten to the marked values.
4. Locate and remove a KO on manual transfer switch for power feed from Power Inlet Box/generator. Install fitting/
conduit as required and pull appropriately sized generator feed wire from Power Inlet Box/generator into manual
transfer switch through conduit. Connect RED and/or BLACK wire to the GEN MAIN circuit breaker, WHITE wire
to the neutral bar and GREEN wire to the ground bar in transfer switch and tighten to the marked values. Rein-
stall transfer switch and load center covers (screws for transfer switch provided in Hardware Kit bag).
5. Turn ON the MAIN load center circuit breaker and all load center circuit breakers. Turn on UTIL MAIN circuit
breaker in the manual transfer switch. Verify that power is restored to all appliances.
2.5 — Wiring Diagram
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