n2aws
Solar Addict
- Joined
- Oct 24, 2022
- Messages
- 696
I've been scouring the NEC (2017 in my area still) for an answer to this.
My inverters support "remote power off" by just completing a circuit between two pins. This immediately shuts the inverters down, and kills all A/C power to the critical loads panel.
In addition to that, my panels on the roof are equipped with Tigo RSD modules that, when they stop recieving the heartbeat, initiate the RSD. The device that sends the heartbeat is plugged into an outlet that is fed from the critical loads panel (that again, loses power when the inverter RPO feature is activated.
Under NEC 2017, does this satisfy the requirements/replace the need for a knife disconnect?
I've also called my AHJ with this question, but all they would say is "Most people use a knife disconnect" which doesn't actually answer my question. Most people are also using microinverters these days, AND don't have batteries/critical loads panel, so that answer is less than helpful.
The only thing the AHJ has actually *answered* for me, is that they still use NEC2017, with no other local requirements with 1 exception.. For roof setbacks, they don't require 2 36" edges leading up the roof. They only require a single 36" walkway.
Anyway, anyone intimately familiar enough with NEC2017 to say difinitively if I can use RPO in place of a knife disconnect (bonus if you can point me to the section, so I can show it to an inspector if needed?)
My inverters support "remote power off" by just completing a circuit between two pins. This immediately shuts the inverters down, and kills all A/C power to the critical loads panel.
In addition to that, my panels on the roof are equipped with Tigo RSD modules that, when they stop recieving the heartbeat, initiate the RSD. The device that sends the heartbeat is plugged into an outlet that is fed from the critical loads panel (that again, loses power when the inverter RPO feature is activated.
Under NEC 2017, does this satisfy the requirements/replace the need for a knife disconnect?
I've also called my AHJ with this question, but all they would say is "Most people use a knife disconnect" which doesn't actually answer my question. Most people are also using microinverters these days, AND don't have batteries/critical loads panel, so that answer is less than helpful.
The only thing the AHJ has actually *answered* for me, is that they still use NEC2017, with no other local requirements with 1 exception.. For roof setbacks, they don't require 2 36" edges leading up the roof. They only require a single 36" walkway.
Anyway, anyone intimately familiar enough with NEC2017 to say difinitively if I can use RPO in place of a knife disconnect (bonus if you can point me to the section, so I can show it to an inspector if needed?)