Generac
®
Power Systems, Inc.
5
Section 2 — Installation
Generac “V” Type and “Y” Type Transfer Switch
2.5
CONNECTING START CIRCUIT
WIRES
Control system interconnections (Figure 2.5) consist
of UTILITY 1 and 2, LOAD 1 and 2; and leads 23 and
194. Control system interconnection leads must be
run in a conduit that is separate from the AC power
lead. Recommended wire gauge sizes for this wiring
depends on the length of the wire, as recommended
below:
NOTE:
The preceding start circuit connections apply to
the standard 2-wire start system only Your transfer
switch may be equipped with a 3-wire connection
system.
2.6
AUXILIARY CONTACTS
If desired, you can access a set of Auxiliary Contacts
on the Transfer Switch to operate customer acces-
sories, remote advisory lights, or remote annunciator
devices. A suitable power source must be connected
to the COMMON (C) terminal. The contacts labeled 1,
2 and 3 (Figure 2.6) are connected at the factory for
operation of transfer switch advisory lights. Contacts
4, 5 and 6 are available for customer use.
Figure 2.6 — Auxiliary Contact Schematic
Auxiliary contacts are rated 15 amperes at 125, 250 or
480 volts AC; 0.5 ampere at 125 volts DC; 0.25 ampere
at 250 volts DC. DO NOT EXCEED THE RATED
VOLTAGE AND CURRENT OF THE CONTACTS.
Contact operation is shown in the following chart:
2.7
OPTIONAL ACCESSORIES
Note any optional accessories that may be installed
on the transfer switch or are to be installed in the
standby electric system in conjunction with the
switch. Complete the necessary connections for these
accessories.
MAXIMUM WIRE LENGTH
RECOMMENDED WIRE
SIZE
460 feet (140m)
No. 18 AWG.
461 to 730 feet (223m)
No. 16 AWG.
731 to 1,160 feet (354m)
No. 14 AWG.
1,161 to 1,850 feet (565m)
No. 12 AWG.
- OPEN SWITCH TO TEST -
2A @ 250Vac MIN.
SWITCH TYPE, SPST
ELECTRICAL RATINGS,
UTILITY 1
UTILITY 2
LOAD 2
23
194
CB2
NEUTRAL
CONNECTION
N1 N2 N3
E1 E2 E3
NEUTRAL
LUG
TRANSFER
SWITCH
UTILITY
SUPPLY
LOAD
CUSTOMER
19
4
23
LO
AD 2
U
TILITY 2
U
TILITY 1
AC GENERATOR
CONTROL PANEL
NOTE:
POWER LEADS AND
TRANSFER SWITCH
LEADS MUST BE
RUN IN TWO
DIFFERENT CONDUITS.
00
E1
E2
E3
N3, E3 AND T3 NOT
USED ON SINGLE PHASE
SYSTEMS
LO
AD 1
REMOTE TEST
SWITCH (OPTIONAL)
Figure 2.5 — Transfer Switch Interconnections (Drawing #79963-B)
Switch Position
Utility
Standby
Common (4) to Normally Closed (6)
Closed
Open
Common (4) to Normally Closed (5)
Open
Closed
