Table of Contents
Advertisement
Electrical System
Connecting Control Circuit Wires
Control system interconnections may consist of N1, N2,
and T1, and leads 23 and 194. The generator control wir-
ing is a Class 1 signaling circuit. See instruction manual
of specific engine generator for wiring connection details.
Recommended wire gauge sizes for wiring depends on
length of wire, as recommended in the following chart:
Maximum Wire Length
1–115 ft (0.30–35 m)
116–185 ft (36–56 m)
186–295 ft (57–89 m)
296–460 ft (90–140 m)
Exception: Conductors of AC and DC circuits, rated
1,000 volts nominal or less, shall be permitted to occupy
the same equipment, cable, or conduit. All conductors
shall have an insulation rating equal to at least the maxi-
mum circuit voltage applied to any conductor within the
equipment, cable, or conduit. See NEC 300.3(C)(1).
Removing Rear Panel and Stub-Up
Cover
1. See
Figure
5-2. Remove six screws with nylon
washers to release rear panel (A) from enclosure.
For best results, rotate left side of panel outward
away from enclosure before disengaging right side.
Figure 5-2. Remove Rear Panel and Stub-Up Cover
2. Remove four screws with nylon washers to release
fascia from control panel.
3. The stub-up cover (B) and five screws with flat
washers are shipped loose and found inside the
enclosure. An optional knock-out (C) is provided.
30
Recommended Wire Size
No. 18 AWG
No. 16 AWG
No. 14 AWG
No. 12 AWG
A
B
C
010039
Table 5-1. Frame Breakers
Frame
Generac 225
Generac 225
Breaker
AF 2 Pole
Range
125A-200A
Wire type
Wire temp.
rating
Lug AWG
6-350 kcmil (1)
range
(number of
conductors)
Lug torque
NOTE: Generac frame breakers are rated at an 80%
continuous load rating. Frame breaker torque specs are
on the breaker data tag.
Typical Load Leads and Control
Wiring in Stub-Up
Figure 5-3
is for reference only. See installation drawings
for unit-specific details.
NOTE: See 300.3(C) and Article 725 in the NEC for rout-
ing of control wires and power wires.
NOTE: A single conduit is permitted.
A
A Load leads
B Control wiring
Figure 5-3. Typical Load Leads and Control Wiring in
Stub-Up
Customer Load Wiring
Customer load wiring consists of single-phase or three-
phase connections between generator main line circuit
breaker (MLCB) and transfer switch. The wiring connects
to lugs E1, E2, (and E3, if three-phase on MLCB), neu-
tral, and equipment ground at generator, and runs to cor-
responding lugs in transfer switch. All load wires, neutral,
and ground should be marked and terminated in the cor-
rect lugs in transfer switch. Verify all wiring is correctly
mounted and terminated at appropriate connection points
Installation Guidelines For Spark-Ignited Stationary Generators
Generac 400 AF
Generac 400 AF
AF 3 Pole
2 Pole
50A-200A
225A-400A
225A-400A
Cu/Al
167 °F
(75 °C)
1/0 -250 kcmil (2)
1/0-250 kcmil (2)
or
4-600 kcmil (1)
4-600 kcmil (1)
375 in-lbs (42.37 Nm)
B
D
C
C Stub-ups
D Concrete pad
3 Pole
or
000385
Advertisement
Table of Contents
