Section 5: Electrical System; General Information; Connecting Generator Feeder Conductors; Connecting Start Circuit Wires - Generac Power Systems D2.5L G2 Installation Manuallines

Section 5: Electrical System

General Information

All wiring must be properly sized, routed, supported, and
connected. All wiring must comply with NEC and local
codes.
The generator uses Customer Connection Interface
(CCI) panels to separate the high voltage and customer
control wiring connections. These two panels are clearly
labeled. The wiring diagrams for each specific unit show
the connection points in their corresponding sections.
Terminal boards are clearly labeled and correspond to
the same terminal connections shown in the wiring
diagrams. Always use the unit specific wiring diagrams
when making wiring connections.
IMPORTANT NOTE: Refer to
Connections in Section 8: Installation Drawings.
Connecting Generator Feeder
Conductors
DANGER
Electrocution. Turn utility and emergency
power supplies to OFF before connecting
power source and load lines. Failure to do so
will result in death or serious injury.
Installation and interconnection diagrams are provided at
the back of this manual.
NOTE: All installations must comply with national, state,
and local codes. It is the responsibility of the installer to
perform an installation that will pass the final electrical
inspection.
The generator supply connection is made at the
generator disconnect
Conductor sizes must be adequate to handle the
maximum current to which they will be subjected, based
on the 75°C column of tables, charts, etc. used to size
conductors. The installation must comply fully with all
applicable codes, standards and regulations.
All power cables can enter the enclosure through the
knockouts provided.
NOTE: If aluminum conductors are used, apply corrosion
inhibitor to conductors.
Tighten terminal lugs to the torque values as noted on the
decal located on the inside of the door. After tightening
terminal lugs, carefully wipe away any excess corrosion
inhibitor.
Installation Guidelines for Protector Diesel Generators
Alternator AC Lead
(000116)
circuit breaker terminals.
CAUTION
Equipment damage. Verify all conductors are tightened
to the factory specified torque value. Failure to do so
could result in damage to the switch base.
Connect generator conductors to clearly marked terminal
lugs in the generator as follows:
Connect generator conductors to disconnect circuit
1.
breaker.
Connect the generator neutral to the neutral
2.
terminal bar.
Connect equipment ground to the equipment
3.
ground lug.

Connecting Start Circuit Wires

Control system interconnections may consist of N1, N2,
and T1, and leads 23 and 194. The generator control
wiring is a Class 1 signaling circuit. Reference instruction
manual of specific engine generator for wiring connection
details. Recommended wire gauge sizes for this wiring
depends on the length of the wire, as recommended in
the following chart:
Maximum Wire Length
1–115 ft (0.3–35 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
1000 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
maximum circuit voltage applied to any conductor within
the equipment, cable, or conduit. See NEC 300.3(C)(1).
Electrical System
(000120)
Recommended Wire Size
No. 18 AWG
No. 16 AWG
No. 14 AWG
No. 12 AWG
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