They were also used in the on circuits powered from the standby generators to stop staff from plugging in unauthorised devices.
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Other countries that use it If you travel a lot, keep in mind that this A and B plug model type is also used in countries such as: Saudi Arabia, Belize, Bolivia, Canada, Cambodia, Colombia, North Korea, South Korea, Costa Rica, Cuba, Dominican Republic, Ecuador, El Salvador, Philippines, Guatemala, Guyana, Honduras, Jamaica, Jordan, Laos, Malaysia, Maldives, Mexico, Nicaragua, Panama, Peru, Puerto Rico, Thailand, Taiwan, Venezuela, Vietnam and Yemen.