Step 2: Install Backup Switch
If Backup Switch is installed with Powershare Gateway, the Backup Switch is installed upstream of all home loads and is the islanding contactor. Backup Switch is then connected to the Powershare Gateway with a 4-conductor communication cable.

Note
Backup Switch with Tesla P/N 1624171-xx-L or greater is required for
Powershare home backup installations.
Note
If the utility is installing Backup
Switch at a later date, see Appendix D: Leave Backup Switch for the Utility to Install for guidance on how to leave Backup Switch, as well as
utility-specific information on requesting that the utility install Backup
Switch.