Overview#
The Cummins C350 N6 is a 350 kW (438 kVA) standby natural gas generator set for mid-range commercial and industrial applications. The unit runs on natural gas or propane vapor (field selectable) and is equipped with PowerCommand controls providing isochronous governing and AmpSentry alternator protection. It carries UL 2200 listing and EPA certification for stationary emergency use.
The C350 N6 occupies the mid-range of the Cummins commercial gas lineup, suitable for hotels, office towers, healthcare clinics, and light manufacturing facilities where 350 kW provides sufficient emergency capacity for life safety, HVAC, and critical process loads without requiring diesel fuel infrastructure.
Technical Specifications#
| Parameter | Value |
|---|---|
| Standby Rating | 350 kW (438 kVA) |
| Frequency | 60 Hz |
| Power Factor | 0.8 |
| Fuel Type | Natural gas / LPG |
| Cooling | Liquid |
| Aspiration | Turbocharged and aftercooled |
| Rated Speed | 1800 rpm |
| NG Fuel Consumption (Full Load) | ~3,500 CFH |
Our Service Experience#
The C350 N6 is a robust mid-range gas unit. At this power level, the engine has more cylinders than the smaller N6 models, so spark plug service takes proportionally longer but remains straightforward. The catalytic converter (where fitted for emissions compliance) should be inspected during annual service -- backpressure buildup from catalyst degradation is the most common cause of power derating on mid-range gas units.
Gas supply sizing is critical at 350 kW. The unit consumes approximately 3,500 CFH at full load, which requires a dedicated gas meter and adequately sized supply piping. We always verify dynamic gas pressure at the engine inlet under full load conditions, not just static -- undersized gas lines are a recurring issue on retrofit installations.
Frequently Asked Questions#
What is the standby rating of the C350 N6? 350 kW (438 kVA) at 60 Hz, 0.8 power factor. This is an Emergency Standby Power (ESP) rating for both natural gas and propane vapor.
What are the service intervals? Oil and filter at 500 hours or 12 months. Air filter at 500 hours. Spark plugs at 1,000 hours. Major overhaul at 30,000 hours.
How does the C350 N6 compare to the C350 D6 diesel? The C350 N6 runs on natural gas or LPG instead of diesel fuel. This eliminates fuel storage tanks, delivery logistics, and fuel degradation concerns. The gas unit requires spark plug and catalytic converter maintenance that the diesel does not, but avoids diesel-specific items like fuel filters, injector service, and DPF regeneration.
Can OnPoint Generators service the C350 N6 in Northern California? Yes. OnPoint Generators provides authorized Cummins natural gas generator service across the San Francisco Bay Area, Silicon Valley, and Northern California.
