4
2.3 MOUNTING
Mounting dimensions for the transfer switch enclosure are in this
manual. This enclosure is configured for wall-mounting using the
tabs provided, top and bottom.
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.
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
Make sure to turn OFF both the NORMAL
(UTILITY) and STANDBY (GENERATOR) power
supplies before connecting to the 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,
possibly lethal, electrical shock.
Power source connections are made at the manual generator
transfer switch and automatic transfer switch contactor.
2.4.1 2 & 3-POLE MECHANISM
This switch (Figure 3) is used with a three phase system when
NEUTRAL is not to be switched. The 2-pole switch is similar in
construction with the N3, E3 and T3 pole removed.
All power voltage supplies must be turned off
before connecting to the power source and
load lines. Failure to turn off power voltage
supplies will result in extremely dangerous
and possibly lethal electrical shock.
Figure 3 — Typical 3-Pole Transfer Mechanism (200
Amp Shown)
All power cables should enter the enclosure on the bottom, sides
or back of the enclosure below the subplate. This is required to
maintain the UL type 3R rating. If installed indoors, conduit/cable
entry can be above the subplate. Standard terminal lugs on all
customer connection points are solderless, screw-type.
Connect power source and load conductors to clearly marked
terminal lugs on the TAS as follows:
• LOAD leads: Connect to bottom-most terminals marked
Customer Load (T1, T2, T3) on the transfer switch contactor.
• NORMAL (UTILITY) Source Leads: Connect to terminals marked
UTILITY SUPPLY (N1, N2 and N3 (if provided).
• STANDBY (EMERGENCY) Source Leads: Connect to manual
transfer switch for generator selection. Note on-site or second-
ary generator markings.
Conductor sizes must be adequate to handle the maximum cur-
rent 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.
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. After
tightening terminal lugs, carefully wipe away any excess corrosion
inhibitor.
Tighten terminal lugs to the torque values as noted inside the
transfer switch door.
Use a torque wrench to tighten the conduc-
tors, making sure not to overtighten, or dam-
age to the switch base could occur. If under-
tightened, a loose connection would result,
causing excess heat which could damage the
switch base.
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.
Installation
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