If we use the AC Power Strip Surge Protector with no grounded plug (Old plug with 2 holes) does it still working in order as to protect against the surge?

Answer: Because the electrical system in Thailand is TN-C-S, which requires a ground rod to install at MDB cabinet (Electrical main cabinet) and need to bond the Ground and Neutral together (at the MDB only), as of this no matter we use the 2-holes outlet plug with no ground or 3 -holes outlet plug with ground, the AC Power Strip Surge Protector is still work with the same performance, this is due to when surge occurred in the electrical system the AC Power Strip Surge Protector will rapidly bypass those surges form Line through the protector unit to Neutral wire and to the ground rod via MDB.

However the surge will rapidly bypassed from Line through the surge protector unit to Neutral wire and to the ground rod via MDB or not it majorly depends on the performance of grounding system as well, and in the case of no ground rod has installed at the MDB the surge will continue to running through the Neutral line down to the electrical transformer outside the building at the electrical pole and will bypassed to ground via transformer ground rod instead which the surge will rapidly bypassed to the ground well or not it depends on how good of the grounding rod and the distance between the surge protector to the ground rod itself.

So in general the performance of the AC power strip surge protector no matter using 2-holes outlet with no ground or using with 3-holes outlet with ground if there’s ground rod installed at the MDB the performance is still the same, how ever if there’s no ground rod installed at MDB the performance of the AC power strip with surge protector will reduced to only 70-80% this is due to the surge will be bypassed to ground at the electrical transformer ground rod outside the building which is more far away, from experienced we’d recommend to make a ground rod with deep earth grounding system as to provides a maximum performance for Thailand areas, for example at least 12 meters deep in Bangkok or at least 24 meters deep in upcountry areas.