We received had a significant weather event here in Texas where I lost a AC Compressor control board, a landscape power supply (literally blew it apart), and some pool equipment. Not sure where the surge came from in this case.
To help avoid this in the future, I have installed a Siemens FS140 SPD in my Main Breaker Panel, which is about 175 ft of cable away from the Meter/service disconnect co-located with the transformer by the street. I have also installed a Intermatic PS3000 SPD at my pool equipment panel.
I have a few questions:
- Given the distance from my Main panel to the sub-panel (~75 FT cable), is there any benefit to installing a second SPD at the sub-panel, or should the FS140 provide adequate protection downstream?
- Further, is there benefit to adding SPD (AG3000 types) to my compressor cutouts, or does the FS140 protect me there as well?.
- Lastly, when the house was built, I have rough-in photos showing the Ufer (lots of rock here in Texas) earth ground line installed into the foundation, and up into the main power panel. Looking in the panel, it’s connected appropriately to the ground bar. There is also a bare copper wire going from the ground bar up into the attic through the framing and over and down to the the entry points for the propane line and the refrigerant lines for the AC compressors (on the outside of the foam insulation). The bare copper for the propane line indeed exists and is bonded to the pipe on the outside wall. For the AC units, on the other hand, I due to not see a bare copper line coming out of the outside wall along with the refrigerant lines. Although there is metal to metal connections of copper refrigerant lines hooked to the AC, wouldn’t this ground line be redundant to the ground wire coming from the power panel that is hooked to ground inside the power cutout and also bonded to the AC metal casing? Wondering if the bare wire is clamped to one of the pipes underneath the insulation, or cut off because it was considered redundant.
I have attached a diagram where I have tried to depict my configuration the best I can.
I’m fine paying more for some additional protection if it indeed has a chance of helping, but would rather save the cost if it not going to do anything.