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Installation
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 sensing and transfer relay circuits.
• Connecting any auxiliary contact (if needed)
• Connect Overload Prevention Control Board loads (as required)
• Testing functions.
2.2
MOUNTING
Mounting dimensions for the transfer switch enclosure are in this
manual. Enclosures are typically wall-mounted. See "Installation
Diagram".
Handle transfer switches carefully when
installing. Do not drop the switch. Protect the
switch against impact at all times, and against
construction grit and metal chips. Never install
a transfer switch that has been damaged.
This transfer switch is mounted in a UL type 3R enclosure. It can be
mounted outside or inside and should be based on the layout of instal-
lation, convenience and proximity to the utility supply and load center.
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.
2.3
CONNECTING POWER SOURCE AND
LOAD LINES
M ake sure to turn OFF both the UTILITY
(NORMAL) and GENERATOR ( STANDBY)
power supplies before trying to connect power
source and load lines to the transfer switch.
Supply voltages are extremely high and dan-
gerous. Contact with such high voltage power
supply lines causes extremely hazardous, pos-
sibly lethal, electrical shock.
Wiring diagrams and electrical schematics are provided in this
manual.
All installations must comply with national, state and local
codes. It is the responsibility of the installer to perform an instal-
lation that will pass the final electrical inspection.
The utility supply connection is made at the UTILITY SERVICE DIS-
CONNECT circuit breaker terminals. The generator and customer
load connections are made at the transfer switch mechanism, inside
the switch enclosure.
4
NOTE:
Conductor sizes must be adequate to handle the maximum current
to which they will be subjected, 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.
All power cables must enter the enclosure through the knockouts
provided. If not using the knockouts, conduit entry into the enclo-
sure must be at or below knockouts to maintain the Type 3R rating.
Conduits should be arranged to provide separation between the Utility
and Generator supply conductors inside the enclosure.
Before connecting wiring cables to terminals, remove any surface
oxides from the cable ends with a wire brush. If not using the knock-
outs, entry must be at or below knockouts. If ALUMINUM conductors
are used, apply corrosion inhibitor to conductors. Tighten terminal
lugs to the torque values as noted 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 corro-
sion inhibitor.
Use a torque wrench to tighten the conductors,
being sure not to overtighten, 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 UTILITY
SERVICE DISCONNECT circuit breaker.
2.
Connect the GENERATOR (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 may consist of N1, N2, and T1, and
leads 0, 23 and 194. Reference instruction manual of specific engine
generator for wiring connection details. Recommended wire gauge
sizes for this wiring depends on the length of the wire, as recom-
mended in the following chart:
MAXIMUM WIRE LENGTH
1-115 ft (1-35m)
116-185 ft (36-56m)
186-295 ft (57-89m)
296-460 ft (90-140m)
Exceptions: If the insulation rating on all wiring is rated for 600V,
and the application meets code, it is acceptable to include generator
control and power wiring in one conduit.
RECOMMENDED WIRE SIZE
No. 18 AWG.
No. 16 AWG.
No. 14 AWG.
No. 12 AWG.
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