I’m just learning about whole home surge protection devices (SPDs). I recently upgraded my electrical panel and decided to add the panel brand’s latest model of in-panel SPD.
The data sheet for the SPD is here.
In the data sheet it says that I can install multiple SPDs in the panel for an increase in modes of protection. Where I am confused is connecting one SPD to the N bus and one SPD to the G bus, since in a main panel the N and G bars are bonded.
Question: if I have one SPD installed L-N and I want to get all 6 modes of protection, do I need to add an L-G connected SPD? Or are all 6 modes already covered in the main panel just by connecting the SPD L-N?