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Generac
®
Power Systems, Inc. 3
2.1 INTRODUCTION TO INSTALLATION
This equipment has been wired and tested at the fac-
tory. Installing the switch includes the following pro-
cedures:
• Mounting the enclosure.
• Connecting power source and load leads.
• Connecting the generator start circuit.
• Connecting any auxiliary contact (if needed)
• Testing functions.
2.2 UNPACKING
Carefully unpack the transfer switch. Inspect closely
for any damage that might have occurred during ship-
ment. The purchaser must file with the carrier any
claims for loss or damage incurred while in transit.
Check that all packing material is completely
removed from the switch prior to installation.
2.3 MOUNTING
Mounting dimensions for the transfer switch enclo-
sure are in this manual. Enclosures are typically
wall-mounted. See “Installation Diagram”, Section 5.
Handle transfer switches carefully when
installing. Do not drop the switch. Protect the
switch against impact at all times, and against
construction grit and metal chips. Never
install a transfer switch that has been dam-
aged.
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.
2.4 CONNECTING POWER SOURCE
AND LOAD LINES
Make sure to turn OFF both the UTILITY
(NORMAL) and EMERGENCY ( STANDBY)
power supplies before trying to connect
power source and load lines to the transfer
switch. Supply voltages are extremely high
and dangerous. Contact with such high volt-
age power supply lines causes extremely haz-
ardous, possibly lethal, electrical shock.
Wiring diagrams and electrical schematics are pro-
vided in this manual. Power source and load connec-
tions are made at a transfer mechanism, inside the
switch enclosure.
2.4.1 2-POLE MECHANISM
These switches (Figure 2.1) are 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.
Figure 2.1 — Typical 2-Pole Transfer Mechanism
(200 Amp Shown)
Solderless, screw-type terminal lugs are standard.
Conductor sizes must be adequate to handle the max-
imum current to which they will be subjected to,
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.
Before connecting wiring cables to terminals, remove
any surface oxides from the cable ends with a wire
brush. All power cables should enter the switch next
to transfer mechanism terminals. If ALUMINUM con-
ductors are used, apply corrosion inhibitor to con-
ductors. 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.
All power cables should enter the switch next to the
transfer mechanism terminals.
Use a torque wrench to tighten the conduc-
tors, being sure not to over tighten, or dam-
age to the switch base could occur. If not
tightened enough, a loose connection would
result, causing excess heat which could dam-
age the switch base.
!
DANGER
!
Section 2 — Installation
Generac GTS “HS” Type Transfer Switch
Switch Wire Conductor Tightening
Rating Range Torque
100A #14-1/0 AWG 50 in-lbs.
200A #6-250 MCM 275 in-lbs.