IM 178 / Page 27
Figure 22a. RDS power wiring connection
Figure 22b. Optional side power wiring entrance
Terminal Block TB1
For 115V Service
Receptacle Circuit
Main Control
Panel
7/8" Knockouts for 115V Service
Receptacle (Qty. 2)
Power Block PB1
or Disconnect
Switch DS1
3" Knockouts For
Power Wire (Qty. 3)
Remove Lifting Bracket
(If Located Here)
Before Drilling Hole
Main
Control
Panel
3" (76 mm)
Max. Dia.
2.75" (70 mm)
16"
(406 mm)
Notes: 1. All wire sizes assume separate conduit for each set of parallel conductors.
2. All wire sizes based on NEC Table 310-16 for THW wire (copper). Canadian electrical code wire ampacities may vary.
3. All wire sizes assume no voltage drop for short power leads.
*To assure that disconnects and power blocks mate with power wiring.
INSUL-
INSUL-
WIRE
QTY. /
ATION
NO. OF
CONDUIT
FOR MCA
WIRE
QTY.
ATION
NO. OF
CONDUIT
FOR MCA
GAUGE
POLE
RATING
CONDUITS
(TRADE
UP TO
GAUGE
POLE
RATING
CONDUITS
(TRADE
UP TO
(
°
C)
SIZE, IN.)
(AMPS)
(
°
C)
SIZE, IN.)
(AMPS)
10
1
60
1
1
⁄
2
30
350
1
75
1
3
310
8
1
60
1
3
⁄
4
40
400
1
75
1
3
335
6
1
60
1
1
55
500
1
75
1
3
380
4
1
60
1
1
1
⁄
4
70
3/0
2
75
2
2
400
3
1
60
1
1
1
⁄
4
85
4/0
2
75
2
2
460
2
1
60
1
1
1
⁄
4
95
250
2
75
2
2
1
⁄
2
510
1
1
75
1
1
1
⁄
4
130
300
2
75
2
2
1
⁄
2
570
1/0
1
75
1
1
1
⁄
2
150
350
2
75
2
3
620
2/0
1
75
1
2
175
400
2
75
2
3
670
3/0
1
75
1
2
200
500
2
75
2
3
760
4/0
1
75
1
2
230
250
3
75
3
2
1
⁄
2
765
250
1
75
1
2
1
⁄
2
255
300
3
75
3
2
1
⁄
2
855
300
1
75
1
2
1
⁄
2
285
350
3
75
3
3
930
Table 10. Recommended 3-phase power wiring*
!
WARNING
!
WARNING
With optional electrical power package
RDS units are provided with internal power wiring for single
point power connection. The single power block or an op-
tional disconnect switch is located within the main control
panel. Field power leads are brought into the unit through 3"
knockouts in the bottom of the main control panel. Refer to
Figure 22a.
Note: Refer to certified drawings for dimensions to wire
entry points.
The preferred entrance for power cables is through the
bottom knockouts provided on the unit. If side entrance is the
only option, a drilling location is provided. The drilling dimen-
sions must be followed exactly to prevent damage to the
control panel. The dimensions provided are the only possible
point of side entrance for the power cables.
The minimum circuit ampacity (wire sizing amps) is shown
on the unit nameplate. Refer to Table 10 for the recom-
mended 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 ex-
ceed 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.
Improper line voltage or excessive phase imbalance
constitutes product abuse. May cause severe dam-
age to the unit’s electrical components.
Assure proper line voltage and phase balance.
A ground lug is provided in the control panel for each
power conduit. Size grounding conductor in accordance
with Table 250-95 of the National Electrical Code.
In compliance with the National Electrical Code, an elec-
trically isolated 115V circuit is provided in the unit to supply
the factory mounted service receptacle outlet and optional
unit lights. This circuit is powered by a field connected 15A,
115V power supply. Leads are brought into the RDS unit
through a
7
⁄
8
" knockout in the bottom of the main control
panel, near the power wire entry point.
Note: The National Electrical Code requires that this 115V
circuit be protected by a ground fault circuit interrupter (GFI)
device (field supplied).
Electrical shock hazard. May cause severe injury or
death.
All protective deadfront panels must be reinstalled and
secured when power wiring is complete.
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