Type B plug, plug head is flat on two legs, plus a grounding prong round pin Type A or is it that a grounding prong. Used primarily in North America and Japan (including Thailand) as well, there are still differences in the size of the pins between the United States and Japan, as well as Type A grounding prong of Type B is longer than the other. two legs always so when it is plugged in. Appliances are grounded. A status as ground before power is being supplied through the plug itself.
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