Connecting Start Circuit Wires - Generac Power Systems RXGW20SHA3 Owner's Manual

T1
T2
A
Figure 2-3. Wiring Connections
5. Connect generator neutral wire to top neutral lug or
side lugs on the panel board.
6. Connect neutral conductors to the lugs and termi-
nals along the neutral/ground bars in panel board
section of transfer switch.
7. Connect a maximum 200A subpanel feeder to
lower T1 and T2 connections. Connect feeder neu-
tral and equipment grounding conductors to the
neutral/grounding terminal bar in the transfer
switch.
8. Connect grounding electrode conductors to neu-
tral/ground terminal bars in panel board portion of
transfer switch.
NOTE: A neutral to equipment ground main bonding
screw (A) is provided for use where transfer switch is
installed as service equipment.
Conductor sizes must be adequate to handle maximum
current they will be subjected to, based on the 75 °C col-
umn of tables, charts, etc. used to size conductors.
Installation must fully comply with all applicable codes,
standards, and regulations.
Automatic Transfer Switch Owner's Manual
All power cables can enter enclosure through provided
knockouts. Additional knockouts into transfer switch can
be made in the field as needed. Conduit entry shall main-
tain correct wire bending spaces required by Tables
312.6 (A) and (B) in the NEC. Conduits should be
arranged to provide separation between utility and gener-
ator supply conductors inside the enclosure.
N1
NOTE: If aluminum conductors are used, apply corrosion
N2
inhibitor to conductors. After tightening terminal lugs,
carefully wipe away any excess corrosion inhibitor.
E1
Tighten terminal lugs to required torque values as noted
E2
on decal located on the inside of the door. After tighten-
ing terminal lugs, carefully wipe away any excess corro-
sion inhibitor.

Connecting Start Circuit Wires

Control system interconnections consist of N1, N2, and
T1, and leads 23, 194, and 9 (ground). The connections
are color coded on the load shed to match connections in
the Generac genset. Generac Type TC-ER-JP tray cable
includes power cables with all necessary color-coded
control wiring. It is suitable for direct burial, overhead,
and indoor wiring.
NOTE: See Article 336 in the 2017 and 2020 editions of
the NEC for more information on the installation require-
ments for Type TC-ER-JP cable.
The generator control wiring is a Class 1 signaling circuit.
See instruction manual of specific engine generator for
wiring connection details. Recommended wire gauge
004982a
sizes for this wiring depends on wire length, as recom-
mended in the following chart:
Maximum Wire Length
1–115 ft (1–35 m)
116–185 ft (36–56 m)
186–295 ft (57–89 m)
296–460 ft (90–140 m)
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 maxi-
mum circuit voltage applied to any conductor within the
equipment, cable, or conduit. See NEC 300.3(C)(1).
Installation
Recommended Wire Size
No. 18 AWG
No. 16 AWG
No. 14 AWG
No. 12 AWG
7