Quick answer
Use the CordFind matcher to identify a compatible connector family, then validate the complete cord assembly against the generator, load, run length, and product instructions. Treat the result as a screening tool, not an electrical installation design.
Interactive gauge check
Check conductor size and voltage drop
| Gauge | Planning ampacity | Drop at 50 ft | Status |
|---|---|---|---|
| 14 AWG | 15 A | 3.2% · 7.6 V | Ampacity |
| 12 AWG | 20 A | 2.0% · 4.8 V | Ampacity |
| 10 AWG | 30 A | 1.2% · 3.0 V | ✓ Passes |
| 8 AWG | 40 A | 0.8% · 1.9 V | ✓ Passes |
| 6 AWG | 55 A | 0.5% · 1.2 V | ✓ Passes |
| 4 AWG | 70 A | 0.3% · 0.7 V | ✓ Passes |
Smallest listed planning size
10 AWG copper1.2% drop · 237.0 V at the loadPlanning estimate for copper conductors at the stated one-way length. Flexible-cord ampacity depends on the complete listed assembly, jacket, temperature rating, conductor count, and application. Verify the actual product and manufacturer instructions.
The minimum inputs for a useful result
Record the full source receptacle designation, destination connection, voltage, expected load, starting requirements, distance, and use environment. Missing connector or voltage information should stop the calculation.
A tool should not infer a house inlet or appliance requirement merely from generator wattage. The endpoint labels and equipment documentation are primary inputs.
How to interpret the result
A compatibility result identifies the connector family and minimum ratings to investigate. The purchased cord still needs a clear product listing and must remain within the requirements of every connected component.
If the result warns about distance, ambiguous voltage, or a building connection, resolve that issue before comparing products. A product list should never override a failed compatibility check.
What the calculator does not determine
It does not inspect grounding and bonding, panel configuration, local code requirements, equipment condition, or installation quality. It also cannot predict every motor-starting or nonlinear load from a single wattage number.
Use a qualified electrician for building wiring, transfer equipment, unclear generator neutral configurations, or any result that depends on site conditions.
Why CordFind uses conservative stops
Unsafe tools often produce an answer even when critical information is missing. CordFind should instead identify the missing input and explain why it matters.
That design protects users and improves search quality: the page answers the decision behind the keyword rather than repeating a generic gauge chart.
Frequently asked questions
Common questions
Can watts alone determine generator cord size?
No. Connector type, voltage, current, distance, conductor count, load behavior, and product ratings also matter.
Does the calculator replace an electrician?
No. It is a compatibility screening tool and cannot inspect or approve building wiring or transfer equipment.
Why does distance matter?
Longer conductors add resistance and voltage drop, which can affect equipment performance and heat.
Primary references
CordFind summarizes connector specifications and public safety guidance. Always follow the instructions supplied with your equipment.