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Receiving & Installation 3‐9MN2408
Electrical Connections Class 1 wiring methods must be used for field wiring connections to terminals of a class
2 circuit. It is the responsibility of the owner/operator to arrange for these procedures to be
performed by a licensed electrical contractor and ensure conformance to all applicable codes
including local codes peculiar to your municipality/city/county and state. Wire size and insulation
type should be as required by NEC (National Electrical Code) and local codes.
Warning: Never connect this generator to the electrical system of any building unless a licensed
electrician has installed an approved transfer switch. The national electrical code (NEC)
requires that connection of a generator to any electrical circuit normally powered by means of
an electric utility must be connected by means of approved transfer switch equipment to
isolate the electrical circuit from the utility distribution system when the generator is
operating. Failure to isolate the electrical circuits by such means may result in injury or death
to utility power workers due to backfeed of electrical energy onto the utility lines.
Warning: Incorrect installation of this generator set could result in property damage, injury or death.
Connection of the generator to its fuel source must be done by a qualified professional
technician or contractor.
WARNING: Be sure the system is properly grounded before applying power. Do not apply AC power
before you ensure that grounds are connected. Electrical shock can cause serious or fatal
injury. NEC requires that the frame and exposed conductive surfaces (metal parts) be
connected to an approved earth ground. Local codes may also require proper grounding of
generator systems.
Intended Use The intended purpose of this generator set is to provide emergency power when the main utility
power supply is interrupted. Therefore, it is important that all the wiring that connects the generator
set with your house, transfer switch, distribution box, battery charger, etc. be properly installed.
Circuit Protection Circuit protection is not provided within the generator. Circuit Breaker protection is an option.
If purchased with your generator, the breaker box is mounted to the generator prior to shipment.
If the optional circuit breaker protection was not ordered, see “GLC Circuit Breaker & Wire Size
Data” in Appendix A for recommendations.
Wire Size Proper lead wire from the circuit breaker to the automatic transfer switch (or load switching
device) is mandatory. See transfer switch information for connection information. When
connecting the generator output to an electrical load, a UL listed circuit breaker with the
appropriate ratings must be provided within 25 feet of the generator set. Use only copper wires.
Generator Rating Input Breaker Rating (at 115% FLA)
Catalog No.
Kilowatt (kW)
Rating
1 Phase Amps
(240VAC) *
3 Phase Amps (240VAC) * 3 Phase Amps (480VAC) *
LPV/Nat. Gas
Delta (Wye)
Nat. Gas
Delta (Wye)
LPV
Delta (Wye)
Nat. Gas
Delta (Wye)
LPV
Delta (Wye)
GLC10 10 50
GLC15 15 70
GLC20 20 100
GLC25 25 125
GLC30 30 110 110 110 60 60
GLC35 35 125 125 125 60 60
GLC45 45 150 150 175 70 80
GLC50 50 175 175 175 90 90
GLC60 60 200 200 200(225) 100 110
GLC80 80 300 300 300 150 150
GLC100 100 300 300 350 150 175
GLC125 125 450 450 400 225 200