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For one- and two-family dwellings, the SunVault system must include an emergency shutdown function to cease the export of power from the SunVault system to premises wiring of other systems. An initiation device must be located at a readily accessible location outside the building and must plainly indicate whether in the OFF or ON position. The OFF position of the device must perform the ESS emergency shutdown (ESD) function. Note: The RPO switch and the ESS disconnect are both able to serve as a SunVault ESD initiation device. See the ESS disconnecting means flowcharts in Appendix A and Appendix B. For one- and two-family dwellings, the SunVault system must include an emergency shutdown function to cease the export of power from the SunVault system to premises wiring of other systems. An initiation device must be located at a readily accessible location outside the building and must plainly indicate whether in the OFF or ON position. The OFF position of the device must perform the ESS emergency shutdown (ESD) function. Note: The RPO switch and the ESS disconnect are both able to serve as a SunVault ESD initiation device. See the ESS disconnecting means flowcharts in Appendix A and Appendix B. 2023 NEC Article 690.12 and 706.15 Compliance The RPO switch is not a disconnecting means, but it does comply with two important NEC requirements: 1. Initiates SunVault PV system rapid shutdown [690.12(C)]. 2. Initiates SunVault system (ESS) emergency shutdown [706.15(B)]. Note: The Hub+ 40 A ESS circuit breaker and/or SunVault’s integrated AC rotary disconnect switch can serve as the ESS’s disconnecting means and ESD initiation device [706.15]. The RPO switch is an ideal RSD and ESD initiation device, as it is small and easy to install. Incorporated within the SunVault system, the RPO switch can serve as the building’s PV RSD initiation device and SunVault’s ESD initiation device. The device that initiates SunVault’s ESD function does not have to be the RPO switch— it can also be a circuit breaker or disconnect switch—but the ESD device selected must be installed outside of the building at a readily accessible location. Although not required per code, the preferred location for SunVault’s ESD is always adjacent to the main service emergency disconnect (typically the main service breaker) as this enables the first responder to quickly shut down all sources of power to the building during an emergency event. 1402 W Meriday Ln - 201816051/10/2024