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1.5
TRANSFER SWITCH
ENCLOSURE
The standard switch enclosure is a National Electrical Manufacturer's
Association (NEMA) and UL 3R type. UL and NEMA 3R type enclo-
sures primarily provide a degree of protection against falling rain
and sleet; undamaged by the formation of ice on the enclosure.
1.6
SAFE USE OF TRANSFER
SWITCH
Before installing, operating or servicing this equipment, read the
SAFETY RULES (inside front cover) carefully. Comply strictly with
all SAFETY RULES to prevent accidents and/or damage to the
equipment. The manufacturer recommends a copy of the SAFETY
RULES are made and posted near the transfer switch. Also, be
sure to read all instructions and information found on tags, labels
and decals affixed to the equipment.
Two publications that outline the safe use of transfer switches are
the following:
• NFPA 70; National Electrical Code
• UL 1008, STANDARD FOR SAFETY-AUTOMATIC TRANSFER
SWITCHES
It is essential to use the latest version of any standard to ensure
correct and current information.
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 utility and generator power source leads.
• Connecting the load leads.
• Connecting any auxiliary contact (if needed)
• Installing/connecting any options and accessories.
• Connect load shed module 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 the "Mounting
Dimensions" drawing.
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.
NOTE:
2.3
CONNECTING POWER SOURCE
AND LOAD LINES
M ake sure to turn OFF both the UTILITY
(Normal) and EMERGENCY (Standby genera-
tor) 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 causes extremely hazard-
ous, possibly lethal, electrical shock.
Wiring diagrams and electrical schematics are provided in this
manual. Power source and load connections are made at the
transfer mechanism, inside the switch enclosure.
2.3.1 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 (400
Amp Shown)
2.3.2 3-POLE MECHANISM
Solderless, screw-type terminal lugs are standard.
The conductor size range is as follows:
Switch Rating
400A
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.
Installation
Wire Range
(1) #4-600 MCM or
(2) 1/0-250 MCM
3
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