Sorry about the delay, I was climbing a small mountain.
I dont know about the temporary installation comment. I took it to be ul458 is always bonded. I was concerned when I installed mine so I did find in the manual that it's only ul458 which makes sense to me because the plugs are built into it and it's not flow through.
The magnum inverter that I mentioned and others that flow through may have both ratings. It can be used like our prowatt units or if wired to the panel and beyond to a sub panel it will remove the inverter bond and it will then depend on the shore power bond. In fact on his unit he also needed to make a GN bond plug for his generator because the gb relay drops out when it sees power from the main panel whether that power is pedestal or generator it doesn't know.
I checked mine as Salvo mentioned. I have 125 v from hot to neutral and 120 v from hot to ground. I have continuity between neutral and ground.
This document says that ul458 units have internal switching. I wouldn't say ours have switching. I'd say they are constant bond. I cant check mine right now to see if it looses the bond when powered down. No real reason it should.
XantrexBondI checked a shoemaker modified 410 watt and it's not bonded. No mention of it in the manual. Putting out 105 volts. :)
My Aims 300 w pure is not bonded. I see no mention of it in the manual. I have been meaning to throw it in the lake but it's still new in box.
Both those units read 35 volts neutral to ground. Probably also along the lines of what Salvo explained.
