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IM 738-2
53
Electrical Installation:
Field Power Wiring
Figure 65. Typical power wire entrance, unit view—RPS 015C to 040Cshown (actual opening shown on submittal
documents)
All Units
The minimum circuit ampacity (wire sizing amps) is shown on
the unit nameplate. Refer to Table 22 on page 54 for the
recommended number of power wires.
Copper wire is required for all conductors. Size wires in
accordance with the ampacity tables in Article 310 of the
National Electrical Code. If long wires are required, it may be
necessary to increase the wire size to prevent excessive voltage
drop. Wires should be sized for a maximum of 3% voltage
drop. Supply voltage must not vary by more than 10% of
nameplate. Phase voltage imbalance must not exceed 2%.
(Calculate the average voltage of the three legs. The leg with
voltage deviating the farthest from the average value must not
be more than 2% away.) Contact the local power company for
correction of improper voltage or phase imbalance.
A ground lug is provided in the control panel for each
disconnect or power block. Size grounding conductor in
accordance with Table 250-95 of the National Electrical Code.
Detail B
12.0
8.8
3.8
0.9 Dia. K.O.
(Qty 4)
3.0 Dia. K.O.
(Qty 3)
6.8
7.6
6.6
Varies
based on
options
Reference from leaving
air end of section
Bottom return
opening
86.5
76.0
3.8
10.0
6.0
20.0
Supply air opening
1.50 MPT drain
A
10.0
3.8
C
B
C
E
3.8
94.0
11.9
12.9
22.3
17.7
15.3
24.3
CAUTION
Provide proper line voltage and phase balance.
Improper line voltage or excessive phase imbalance constitutes
product abuse. It can cause severe damage to the unit's
electrical components.