Ground neutral bond screw on a PON main panel
On a main panel, you always bond the neutral and ground. Just because it's a PON panel doesn't change that. The reason they don't have it &quot;factory bonded&quot; is because sometimes they get used as a sub-panel. This is becoming the case more often.  If the panel is covered by a separate disconnect, which is becoming required, then the main panel gets treated like a sub-panel.