HEAT SENSOR & SEAL FAILURE
NUMBER OF CONDUCTORS REQUIRED BETWEEN CONTROL PANEL AND NEMA 4 JUNCTION BOX
Power lines and control wires can be carried in conduit or can be underground buried cable.
System Number of Number of Number of
Type Control Wires Power Lines Ground Wires #8 Number of Number of
Sensor Wires Ground Wires
Simplex 3 3 1 3 1
Simplex with Alarm 5 3 1 3 1
Duplex 5 6 1 6 2
Duplex with Alarm 7 6 1 6 2
3
Typical duplex systems use three
con trols: one set at turn-off, one
set at turn-on for one pump, and
one set for turn-on for two pumps.
Pumps alternate op er a tion on each
successive cycle.
Two pumps operate together only
if sump level rises to the third or
override control. The override
control also brings on the second
pump in case of failure of the
first pump. Extra floats with
ap pro pri ate controls can be
supplied for alarm functions.
Triplex systems use four controls:
one set at turn-off, one set
at turn-on for one pump, one set
at turn-on for two pumps, and
one set at turn-on for three
pumps. Pumps alternate each
successive cycle.
Three pumps operate together
only if sump level rises to the
fourth control (second override).
This control also brings on the
third pump in case of failure
of either or both of the first
two pumps.
Alarm Controls:
The alarm level is usually set
above the override level so the
alarm will signal only if the override
level is exceeded. However, some
engineers prefer to have the alarm
level set below the override level
as it is possible for one pump to
fail and the other pump to operate
on the override level with the
sump level never reach ing the
alarm level. This is par tic u lar ly
true in cases of low inflow ca pac i ty.
Electrical Control Panel:
It is recommended that the
Hydromatic control panel be used
with all pumps as proper starter
heaters and connections for heat
sensor wires are furnished.
IMPORTANT: If Hydromatic
electrical controls are not used
and the motor fails be cause of
improper components or if the
heat sensors are not properly
con nected, the motor guarantee
is void.
Hydromatic electrical equipment
is installed in a weatherproof
NEMA 3R enclosure.
WARNINg: Do not open swing
cover until you have first
disconnected the power.
The electrical equipment includes
a main circuit breaker for each
pump, a magnetic starter with
WIRE SIZE AND MAXIMUM LENGTH (FEET) FOR REMOTE LOCATION OF CONTROL PANEL
BASED ON A 2% VOLTAGE DROP (230 VOLTS 3 PHASE)
Copper Wire Amperes @ 230 Volts*
No. D.C. Res.
AWG /M Ft. 5 10 15 20 25 30 40 50 60 70 80 90 100 120 140 160 180 200
12 1.620 325 165 110 80 65 55
10 1.018 520 260 175 130 105 85 65
8 0.6404 830 415 275 205 165 140 105 80
6 0.410 1295 645 430 320 260 215 160 130 105 90 80
4 0.259 1025 680 510 410 340 255 205 170 145 130 115 100 85
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3 0.205 1295 865 650 520 430 325 260 215 185 160 145 130 110 90
2 0.162 1090 820 655 545 410 340 295 255 230 205 180 160 135 110 100
1 0.129 1030 825 685 515 410 340 295 255 230 205 170 145 130 115
0 0.102 1040 865 650 520 435 370 325 290 260 215 185 160 145 130
00 0.0811 1090 820 655 545 470 410 365 325 270 235 205 180 165
000 0.0642 1035 825 690 590 515 460 415 345 295 260 230 205
NOTE: For 460 volts obtain distance by multiplying by 2.0 ‡60°C
For 570 volts obtain distance by multiplying by 2.5 ‡Rating 90°C
* 230 volt system not recommended for above 30 to 40 horsepower. Insulation @ 30°C Amb.
‡ Based on 3 power conductors in cable or conduit, for 4 to 6 reduce ampacity to 80% & for 7 to 24 reduce to 70%.
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Special junction box required for wire sizes larger than #4.
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