Size My Backup

Permit packet printer

Fill in your setup and print a one-page summary to hand to your electrician or building department. It runs in your browser; nothing is stored or sent. Currently covers a generator or battery inlet connected through a panel interlock kit.

Maths: inlet breaker and wire size (2023 NEC 240.6(A), Table 310.16). Never connect a generator to a panel with a double-ended cord; use an interlock or transfer switch.