I recently bought a pure sine wave 2kV portable generator to use for camping. In the manual it states that the generator should be grounded to actual earth through a metal stake and then attached to an earthing bolt on the generator at all times.
I’ve confirmed that there is low DC resistance between the earth bolt and mains IEC earth plug outlet on the generator using a multimeter (no surprises there).
I then measured the DC resistance between the IEC earth pin and neutral on the outlet of the generator and got an open circuit. I am not 100% certain that this is a conclusive test that determines that galvanic isolation exists between the earth and neutral pin on the generator. However let’s assume there is isolation between the neutral and earth for now.
If I can 100% prove that galvanic isolation exists between the neutral and the earth on the outlet of the portable generator then am I right in saying there is absolutely no point in earthing the generator with a stake into the ground from a safety point of view?
Even if the neutral was bonded to the earth pin of the generator and an active wire came loose and hit the case on a faulty connected appliance, the current would have a low resistance path through the earth wiring back to the generators neutral and not through the person holding the faulty appliance.
Not sure if I’m missing something but I don’t understand why you would want to ground a portable generator to actual earth using a stake in any situation. I don’t even understand why the main power distribution networks ground the service line transformers to actual earth which means we then need RCD's, seems like we are making it less safe from a safety point of view but this is a topic for another discussion.