Find the exact code-compliant NEMA plug, inlet box, and connection path to wire your generator to your house safely — never with a dangerous DIY cord.

🇺🇸 US NEMA connectors and 120/240 V split-phase service.

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Never use a “suicide cord.” A double-male cord plugged into a wall outlet to backfeed your house is illegal, kills utility linemen, and can burn your home down. The safe, code-compliant path is a transfer switch or interlock kit with a proper generator inlet box — this guide shows the matching connector for your generator.

1 · Your generator

Generator running watts Does it have a 240V outlet?

The 240V outlet is the round, twist-to-lock receptacle on your generator's panel — not the standard household-style sockets. Whole-home backfeed through a transfer switch requires one.

2 · Connection method

Interlock kit Transfer switch

An interlock kit is a sliding plate on your main panel that lets the generator backfeed safely (cheaper, powers any circuit, needs an inlet box). A manual transfer switch is a separate sub-panel of selected circuits. Both need a generator inlet box matched to your cord.

Your connector

Connector ratings: L14-20 (20A, ~3,800W), L14-30 (30A, ~7,500W), CS6364/SS2-50 (50A, ~12,500W) — all 120/240V 4-wire locking. Match the connector to your generator's actual outlet; never adapt up to a higher-amp cord than the outlet or breaker supports. Generator interlock and inlet installation should be done or inspected by a licensed electrician and must comply with your local code. Diagrams are schematic, for identification — not exact pin geometry.

Keep planning — related tools

Transfer switch & wire sizing →

Safe switch amperage and wire gauge.

Extension cord size & safety →

The safe cord gauge for running power outdoors.

Whole-home load sizer →

Size a generator from your real appliance load.