4
Section 3 — Operation
RTS “HS” Type Transfer Switch
Before connecting wiring cables to terminals, remove any surface
oxides from the cable ends with a wire brush. If ALUMINUM con-
ductors are used, apply corrosion inhibitor to conductors. Tighten
terminal lugs to the torque values on "Utility Service Disconnect
Circuit Breaker", and on the decal located on the inside of the door.
After tightening terminal lugs, carefully wipe away any excess cor-
rosion inhibitor.
Use a torque wrench to tighten the conduc-
tors, being sure not to overtighten, or damage
to the switch base could occur. If not tightened
enough, a loose connection would result, caus-
ing 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 UTILITY
SERVICE DISCONNECT circuit breaker.
2. Connect the GENERATOR (STANDBY) source power cables to
switch terminals E1, E2.
3. Connect customer LOAD leads to switch terminals T1, T2.
Conductors must be properly supported, of approved insulative
qualities, 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.
2.5 CONNECTING START CIRCUIT
WIRES
Control system interconnections consist of N1 and N2, and leads
23 and 194/15B. 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 in the following chart:
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.
3.1 FUNCTIONAL TESTS AND
ADJUSTMENTS
Following transfer switch installation and interconnection,
inspect the entire installation carefully. A competent, qualified
electrician should inspect it. The installation should comply
strictly with all applicable codes, standards, and regulations.
When absolutely certain the installation is proper and correct,
complete a functional test of the system.
Perform functional tests in the exact order pre-
sented in this manual, or damage could be done
to the switch.
IMPORTANT: Before proceeding with functional tests, read and
make sure all instructions and information in this section are
understood. Also read the information and instructions of labels
and decals affixed to the switch. Note any options or accessories
that might be installed and review their operation.
3.2 MANUAL OPERATION
DANGER
Do NOT manually transfer under load.
Disconnect transfer switch from all power
sources by approved means, such as the main
circuit breaker(s).
A manual HANDLE is shipped with the transfer switch. Manual
operation must be checked BEFORE the transfer switch is operated
electrically. To check manual operation, proceed as follows:
1. Turn the generator’s AUTO/OFF/MANUAL switch to OFF.
2. Turn OFF both UTILITY (service disconnect circuit breaker)
and GENERATOR (generator main line circuit breaker) power
supplies to the transfer switch.
3. Note position of transfer mechanism main contacts by
observing the moveable contact carrier arm. This can be
viewed through the long narrow slot in the inside cover of the
ATS. The top of the moveable contact carrier arm is yellow to
be easily identified.
• Manual operation handle in the UP position - LOAD terminals
(T1, T2) are connected to UTILITY terminals (N1, N2).
• Manual operation handle in the DOWN position - LOAD termi-
nals (T1, T2) are connected to EMERGENCY terminals (E1,
E2).
Do not use excessive force when operating the
transfer switch manually or damage could be
done to the manual handle.
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