I recently purchased a Siemens MM0202B1200 200-Amp meter / disconnect combo panel. I would like to connect a Square D HEPD80 Type 1 SPD inside the disconnect panel.
The SPD has 4 wires: 2 black, 1 white, 1 green. From looking at the disconnect panel, I can see that I can use ring terminals on the 2 black wires and then connect them to the locking nuts on the 200A breaker's two hot lugs.
EDIT: Rookie mistake pointed out by Harper below: I somehow overlooked the two additional lugs on the load side of the 200A breaker (duh, how else are you going to connect to the main panel?). I should not connect the SPD's 2 black wires with ring terminals, but rather to the load side of the breaker with Polaris connectors.
Since the disconnect panel does not have a neutral or ground bus bar, I am unclear on how to properly connect the ground and neutral wires. In addition to the photos from the Amazon link (above), I have attached an image of the panel's wiring below.
From this image you can see lugs labeled N1 through N4 which I think are the ground and neutral lugs. On the service disconnect side there are two N3 lugs and two N4 lugs. I believe N3 is for the home's load center neutral line and the N4 is for the ground. The N3 lugs are rated for a minimum #4 wire and the N4 lugs are rated for a minimum #14 wire.
The SPD has #12 wires, meaning that I can connect the SPD's ground to the N4 lug (rated for #14 wire), but since the N3 lug requires at least #4 wire, I cannot connect the SPD's #12 neutral.
What is the proper way to connect the SPD's #12 neutral wire to the panel's N3 lug which requires a minimum of #4 wire?