Mounting Guidelines
The transfer switch system circuitry is enclosed in a NEMA Type 3R
enclosure suitable for indoor/outdoor use. Guidelines for mounting
the enclosure include:
• Install enclosure on a firm, sturdy supporting structure.
• The transfer switch enclosure must be installed with
minimum NEMA 3R hardware for conduit connections.
• To prevent switch contact distortion, level and plumb the
enclosure. This can be done by placing washers between the
enclosure and the mounting surface.
Control
Wiring
Hot
Water
Heater
A/C Themostat
Air
Conditioner
Service
Disconnect
NOTICE: The load
outputs of the
transfer switch can
Dual 200 Amp
supply one 200 Amp
panel each. These
outputs MUST NOT
be combined, or
used individually to
supply a panel larger
than 200 Amps.
Incorrect!
6
400 Amp
Watt / Hourmeter
200 Amp
Utility
Contactor
Distribution
Panel #1
Branch
Circuits
Furnace/Air
Handler
Generator
Transfer
Switch
400A
text
• NEVER install the switch where any corrosive substance
might drip onto the enclosure.
• Protect the switch at all times against excessive moisture,
dust, dirt, lint, construction grit and corrosive vapors.
A typical automatic transfer switch installation is depicted below. It
is best if the transfer switch is mounted near the utility meter, either
inside or outside. Discuss layout suggestions/ changes with the
owner before beginning the system installation process.
BUS
200 Amp
Utility
Transfer
Switch
Distribution
Panel #2
Branch
Circuits
Dual 200 Amp
Transfer
Switch
400A
text
Incorrect!
Appliance
Appliance
Dual 200 Amp
Transfer
Switch
200A
200A
text
text
Correct
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