AC spd protection ?

[augie47]

In '23 would 215.18 not require a SPD at the subpanel ??

 

[Flicker Index]

Now I just wish the PoCo meter would add a capability that continuously monitor L1-N, and L2-N voltages and one it records more than 150v or so between N and either of the lines, it would activate a service disconnect and throw on a warning lamp and notify the PoCo. That would avoid quite a few loose/lost neutral related damages caused on the feeder end