Product Manual

4
Figure 2.1 — Typical 2-Pole Transfer Mechanism
(200 Amp Shown)
UTILITY
CLOSING
COIL
GENERATOR
CLOSING
COIL
UTILITY LUGS
GENERATOR
LUGS (E1 & E2)
LOAD LUGS (T1 & T2)
Solderless, screw-type terminal lugs are standard.
Switch
Rating
Wire Range
Conductor Tightening
Torque
100A #14-1/0 AWG 50 in-lbs.
200A #6-250 MCM 275 in-lbs.
Conductor sizes must be adequate to handle the maximum 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
conductors are used, apply corrosion inhibitor to conductors. 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 mecha-
nism terminals.

Use a torque wrench to tighten the conductors,
being sure not to over tighten, or damage to
the switch base could occur. If not tightened
enough, a loose connection would result,
causing excess heat which could damage the
switch base.
Connect power source load conductors to clearly marked transfer
mechanism terminal lugs as follows:
1. Connect UTILITY (NORMAL) power source cables to switch
terminals N1, N2.
2. Connect EMERGENCY (STANDBY) source power cables to
transfer switch terminals E1, E2.
3. Connect customer LOAD leads to switch terminals T1, T2.
Conductors must be properly supported, of approved insulative quali-
ties, protected by approved conduit, and of the correct wire gauge size
in accordance with applicable codes.
Be sure to maintain proper electrical clearance between live metal
parts and grounded metal. Allow at least 1/2 inch for 100-400 amp
circuits.
2.4 CONNECTING START CIRCUIT WIRES
Control system interconnections (Electrical Data section) consist of
UTILITY 1 (N1), UTILITY 2 (N2) and LOAD (T1), and leads 23, 194
and 0. Recommended wire gauge sizes for this wiring depends on the
length of the wire, as recommended in the following chart:
MAXIMUM WIRE LENGTH
RECOMMENDED WIRE
SIZE
1-115 ft (1-35m) No. 18 AWG.
116-185 ft (36-56m) No. 16 AWG.
186-295 ft (57-89m) No. 14 AWG.
296-460 ft (90-140m) No. 12 AWG.
2.5 OVERLOAD PREVENTION CONTROL
BOARD (OPCB)
The OPCB can control an air conditioner (24 Vac) directly or a
separate contactor PPM (24 Vac or 120 Vac operating coil) which can
control any load connected to it. See Figure 2.2.
The Power Management Module (PMM) is not supplied with the trans-
fer switch. It can be purchased separately from the manufacturer. for
use with the Overload Prevention Control Board (OPCB) mounted in
the transfer switch. The OPCB is designed and connected to power
the PMM contactor operating coil. The OPCB is supplied by a 24 Vac
supply, class 2 power supply transformer, connected to the LOAD
supply in the RTS. (Each output is limited to 1 amp) The PMM contac-
tor coil connections are made at the OPCB terminal strip.
Connect the PMM contactor coil to OPCB contactor terminals (1, 2,
3 or 4). The selection of contactor terminal used will depend on the
priority of the load being controlled. This is a 24 Vac circuit and wiring
methods for class 2 should be used. Use ¼” quick connect terminals
to make the contactor coil connections on the PMM. See Figure 2.3.
A grommet is provided to route Class 2 wiring through. The grommet
can be used in any knockout for NEMA 1 installations. The grommet
can only be used in the bottom knockouts for NEMA 3R installations.
Installation