Generator AC Lead Connections

Standby Generator Sets

General Information

See “Voltage Codes”. This generator may be rated at any one of three voltages, either single-phase or three-phase. The electrical wires in the unit’s AC con- nection (lower) panel should be installed according to the number of leads and the voltage/phase required for the application. If there are any questions regard- ing lead connection, refer to the wiring diagrams at the back of this manual.

Voltage codes apply to the type of stator assembly installed on a particular generator.

FOUR-LEAD, SINGLE-PHASE STATOR

Four-lead generators (see Figure 7.1) are designed to supply electrical loads with voltage code “A” (240V, 1-phase, 60 Hz). Electrical power is produced in the stator power windings. These windings were con- nected at the factory to the main circuit breaker as shown in Figure 7.1.

The rated voltage between each circuit breaker ter- minal is 240V. The rated voltage between each circuit breaker terminal and the neutral point 00 is 120V.

Figure 7.1 — Four-lead, Single-phase Stator

ALTERNATOR POWER WINDING CONNECTIONS

3-PHASE ALTERNATORS

The generator is designed to supply 3-phase electri- cal loads. Electric power is produced in the alterna- tor power windings. These windings were connected at the factory to the main circuit breaker with a “Y” configuration as shown in Figures 7.2 and 7.3.

The rated voltage between circuit breaker terminals E1-E2, E1-E3 and E2-E3 is either 480V or 208V depending on the model.

The rated voltage between each circuit breaker termi- nal and the neutral point 00 is either 277V or 120V depending on the model.

Figure 7.2 — Stator Power Winding

Connections - 3-phase, 277/480V (6 Lead)

S1	E1
INTERNAL
CONNECTIONS
			L-L
S6	S4
		NEUTRAL
		NEUTRAL
	S5
E3 S3		S2	E2
		S2	E2

L-N

Figure 7.3 — Stator Power Winding

Connections - 3-phase, 120/208V (6 Lead)

S1 S1

	S4		S4		L-L
				00 (NEUTRAL)
	S6		S5

S3	S6	S5		S2

E3	S3			E2
				S2

L-N

7-1

08/05

0 .Rev ACConn001

005260-1, 005259-1 specifications

Generac Power Systems has established itself as a leader in the power generation industry, particularly with its innovative range of home backup generators. Among its popular models are the Generac 005259-1 and 005260-1, both of which reflect the company’s commitment to engineering excellence, reliability, and user-centric design.

The Generac 005259-1 is a 22 kW air-cooled standby generator that operates on either natural gas or liquid propane, providing ample power for essential home appliances during an outage. This model features a robust V-twin engine, which not only ensures durability but also enhances performance in various weather conditions. Its Quiet-Test technology allows the generator to run a self-test at a lower RPM, reducing noise and conserving fuel while still ensuring that the unit is operational.

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Installation of both units can be streamlined with their adaptable mounting pads and flexible connection options. Furthermore, Generac provides comprehensive support services, including warranty programs and maintenance plans, ensuring customers have access to the assistance they need post-purchase.

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Generac Power Systems 005259-1 Generator AC Lead Connections, FOUR-LEAD, SINGLE-PHASE Stator

Models: 005260-1 005259-1