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2.1
INTRODUCTION TO
INSTALLATION
This equipment has been wired and tested at the factory. Installing
the switch includes the following procedures:
•
Mounting the enclosure.
•
Connecting power source and load leads.
•
Connecting the generator start and sensing circuit.
•
Connecting any auxiliary contact (if needed)
•
Testing functions.
2.2
UNPACKING
Carefully unpack the transfer switch. Inspect closely for any dam-
age that might have occurred during shipment. 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 enclosure are in
this manual. Enclosures are typically wall-mounted. See the
"Installation Diagram" section.
Handle transfer switches carefully when install-
ing. Do not drop the switch. Protect the switch
against impact at all times, and against con-
struction grit and metal chips. Never install a
transfer switch that has been damaged.
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
DANGER
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 voltage power supply
lines will result in an extremely hazardous, pos-
sibly lethal, electrical shock.
Wiring diagrams and electrical schematics are provided in this
manual. Power source and load connections are made at a transfer
mechanism, inside the switch enclosure.
Section 2 — Installation
RTS "HS" Type Transfer Switch
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)
UTILITY
CLOSING
COIL
GENERATOR
CLOSING
COIL
LOAD LUGS (T1 & T2)
Solderless, screw-type terminal lugs are standard.
Switch
Wire Range
Rating
100A
#14-1/0 AWG
200A
#6-250 MCM
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
mechanism 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, caus-
ing excess heat which could damage the switch
base.
UTILITY LUGS
GENERATOR
LUGS (E1 & E2)
Conductor Tightening
Torque
50 in-lbs.
275 in-lbs.
3
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