In the past, The Wolff , with his electrical knowledge, would have been replying to this topic. Sadly he js not with us anymore.
So I'll offer my explanation as there seems to be some discrepancies.
That little plastic square RCD does not have an earth connection. Only line in and line out, and return in and return out. Or if VECO, line 1 in line 1 out, line 2 in line 2 out. The function of the RCD is to check the current flow going out is the same as that coming back down the other line, down to typically 30mA. This is apparently regarded as a "reasonably safe" safe human nip limit. Any difference in the current above 30mA will cause the RCD to trip.
They are not often less than 30mA due to nuisance tripping, and maybe the difficulty of economically manufacturing a reliable device for, say, 5mA current imbalance.
So in the context of the Philippines, where most times only 2 wires enter the house, where does earthing come in to things with respect RCD's?
By earth, I mean an independent wire running round to 3 pin sockets, or if 2 pin an independent wire running round casings of appliances and then connected to an earth rod, building steelwork or other effective earthing point. Don't confuse this with the outside rod sometimes used by the CEBECO type system which is connected between their neutral line and earth at the entry point to the house.
With an RCD fitted and no earth wire, if an appliance develops a fault and the casing becomes live, it will sit there waiting for you to touch it. When 30mA passes through you, it will detect that current out doesn't equal current in by 30mA, and then trip. Hopefully saving you from injury.
But if the appliance had an earth wire, the fault causing the casing to become live would have sent current down the earth wire thereby unbalancing the RCD when this reaches 30mA and tripping it before you touched it.
Just a side note.
Our one and Only pole in the Sub Division that came down that I think does everything was reinstalled (by VECO) by an 8 man crew from Tarlac (Manila). According to my wife a Bisaya/Tagalog speaking Forman was allocated to help with Bisaya if needed.... Interesting.....We were so happy that the sub division residents chipped in with Jollybee for the lot...
Thank you Cookie for the information on Mactan Island, it sounds like no power or internet yet. The Expat had to leave because the brother in-law in the compound was threatening to kill him, plus he had some minor I think health issues that needed to be addressed.
Now this same brother in-law is blocking people from visiting his wife within this compound, he can't even contact the PNP or Municipality because nobody seems to be up and running.
Mr Mike do you still live in Ellijay, Ga. i am going there in Aug to visit a Navy shipmate a WO4 he lives in a log cabin home back in the woods have been there 3 times as it not far from Anderson SC where i live