RT-SVX073A-EN
51
Figure 34. Disconnect switch external handle
Locking
Slot
Locking
Thumb
Key Under
Handle
Note: All field installed wiring must conform to NEC
guidelines as well as State and Local codes.
An overall layout of the field required power wiring is
illustrated in . To ensure that the unit supply power wiring is
properly sized and installed, follow these guidelines:
WARNING
Live Electrical Components!
Failure to follow all electrical safety precautions when
exposed to live electrical components could result in
death or serious injury.
When it is necessary to work with live electrical
components, have a qualified licensed electrician or
other individual who has been properly trained in
handling live electrical components perform these
tasks.
NOTICE
Use Copper Conductors Only!
Failure to use copper conductors could result in
equipment damage as the equipment was not
designed or qualified to accept other types of
conductors.
• Verify that the power supply available is compatible
with the unit nameplate rating for all components. The
available power supply must be within 10% of the rated
voltage stamped on the nameplate.
• Use only copper conductors to connect the 3-phase
power supply to the unit.
Electric Heat Units
Electric Heat Units require one power entry as illustrated in
.
Use the information provided in Service Sizing data and the
“Power Wire Sizing & Protection Device Equations,” to
determine the appropriate wire size and Maximum Over
current Protection for the heaters/unit.
Note: Each power supply must be protected from short
circuit and ground fault conditions. To comply with
NEC, protection devices must be sized according to
the “Maximum Over current Protection” (MOP) or
“Recommended Dual Element” (RDE) fuse size data
on the unit nameplate.
Provide grounding for the supply power circuit in the
electric heat control box.
Main Unit Power Wiring
and lists the field connection wire ranges for both the main
power terminal block and the optional main power
disconnect switch. The electrical tables beginning with list
the component electrical data.
The electrical service must be protected from over current
and short circuit conditions in accordance with NEC
requirements. Protection devices must be sized according
to the electrical data on the nameplate. Refer to the
equations listed in the product catalog to determine the
following:
• the appropriate electrical service wire size based on
“Minimum Circuit Ampacity” (MCA)
• the “Maximum Over Current Protection” (MOP) device
WARNING
Proper Field Wiring and Grounding
Required!
Failure to follow code could result in death or serious
injury.
All field wiring MUST be performed by qualified
personnel. Improperly installed and grounded field
wiring poses FIRE and ELECTROCUTION hazards. To
avoid these hazards, you MUST follow requirements
for field wiring installation and grounding as
described in NEC and your local/state/national
electrical codes.
The location of the electrical service entrance is illustrated
in . It is important to complete the unit power wiring
connections onto either the main terminal block or the
factory mounted, non-fused disconnect switch. The
disconnect switch is inside the unit control panel .Refer to
the diagrams that shipped with the unit for specific
termination points.
Provide proper grounding for the unit in accordance with
local and national codes.
Installation
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