Types A and B, 120 V, 60 Hz – those are the basics for electricity in Canada. The grid in Canada delivers 120 V. Dual-voltage gear copes; single-voltage 230 V devices do not. The grid runs at 60 Hz. Chargers do not care; mains-synchronised clocks and simple motors do.
The same socket system is used in Guatemala, Barbados, Antigua and Barbuda and Nicaragua, so one adapter covers all of them. Nearby but different: Greenland, Guadeloupe and Dominica – an adapter for Canada will not fit there. Across North and Central America this setup is common: 24 of 31 countries.
Protective earth
Grounded and ungrounded sockets may occur
Earthed sockets (Type B) and unearthed ones (Type A) exist side by side. For metal-bodied appliances the protective-earth path is what matters.
Canada supplies 120 V. Dual-voltage chargers are fine; 230 V-only appliances need a converter.
An adapter changes the plug shape only, not voltage or frequency. Canada supplies 120 V at 60 Hz – check the rating plate on your device. How to read a rating plate →
If a socket gets hot, crackles or smells burnt, unplug the device straight away.