The electricity in Thailand is poor and most houses surely in villages
circuits may not be connected to ground (earth).
*Expect to get some small shocks from electic stuff when they being
pluged..
Be carefull from leaving precious/expensive electic stuff while you're
away as the electric is not stable and it can be damaged (!).
Read more about it here(discussion on this exact matter):
http://www.thaivisa.com/forum/Thai-Domestic-Electrical-Work-t113749.html&pid=2440540&st=75+Article below !
Electricity in ThailandElectricity in Thailand is 220 Volts, alternating at 50 cycles per second. If you travel to Thailand with a device that does not accept 220 Volts at 50 Hertz, you will need a voltage converter.
The plug on the electrical device you use in the US will not fit into the wall outlet in other countries. Therefore, you will need a plug adaptor in order to plug your device into the electrical outlets overseas
Thailand Plug Adapters and Outlet ShapesOutlets in Thailand generally accept 2 types of plug:Flat blade plug (See picture attached).
Two round pins (See picture attached).
If your appliance’s plug has a different shape than the photos shown above, you will need a plug adapter. Depending on how much you plan to travel in the future, it may be worthwhile to purchase a combination voltage converter and plug adaptor.
Converters, Transforms, and AdaptorsConverters should be used only with electric appliances, such as hair dryers, irons, and toothbrushes. Electric appliances are simple heating devices or have simple mechanical motors. Converters should not be used for more than three hours at a time.
Transformers are used with electronic appliances. Electronic appliances have a chip or circuit. Examples are radios, CD players, shavers, computers, computer printers, and televisions. Transformers can also be used with electric appliances and may be operated continually for many days.
Converters and transformers are available for appliances of different wattages. To determine how many watts your appliance requires, look at the label located on the appliance or in the owner's manual. The label or manual will show the input voltage (100, 120, 220, 240) written as volts, V, volts AC or VAC, the wattage (written as watts or W) and sometimes the amperage (0.5 Amps or 0.5 A or 500 mA). If only the amperage is shown, multiply the input voltage by the amps to find the watts. Volts x Amps = Watts. (Example - 120V x 0.5A = 60W; meaning a 120-volt appliance rated at 0.5 amps is a 60 watt appliance and requires a transformer or converter of at least 60 watts).
Plug Adaptors do not convert electricity. Adaptors will allow a dual-voltage appliance or an appliance paired with a transformer or converter of one country to be plugged into the wall outlet of another country. The plug of a US electrical device will not fit into outlets in most countries without an adapter.
Taking Your Laptop AbroadAC adapters as well as most laptops and battery chargers are dual voltage. Because they are dual voltage, they only require a plug adaptor for Thailand. It is advisable that you use a surge protector with your laptop. You can purchase a surge protector in your host country.
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