While power conversion offers a range of possibilities to the user, there are several safety considerations you must be aware of.
Do not use a power converter of any type for critical equipment such as medical devices unless so advised by the equipment manufacturer.
Do not use a power converter of any type if you are not sure of your equipment's power ratings; contact the manufacturer for this information.
The AC outlet in many foreign bathrooms is for low-wattage devices only. To avoid damage to your converter and/or attached device, check with your host or hotel before powering a high-wattage device (such as a hair dryer) from this plug.
Do not use a voltage converter with electronic devices such as televisions, VCR's and computers unless the device indicates that it can handle both 50 Hz and 60 Hz.
Do not use heating appliances, such as hair dryers, irons and coffee-makers, on a transformer-based voltage converter.
Do not use non-heating electronic devices, such as calculators, electric razors and portable audio players, on solid-state voltage converter.
Do not use 110-120 VAC Surge protectors or Uninterruptible Power supplies on a 220-240 VAC system. Even with a step-down power converter, damage could occur as the two power systems are wired differently.