I'm making an LED matrix with a board and 4X WS2811 strips (5 m length, 150 LEDs). Each strip is 45 W, takes 12 V and is 3.75 A. I have connected them in series and injected a 12 V, 60 W/5 A adapter for every strip. It's powered by an Arduino Uno and all grounds are connected to the ground in the Arduino.
My question is, can this safely be power on from a single household outlet? I believe here in Canada each outlet can handle 15 A. So if this is true, is it unsafe to power all of these from a single outlet? The reason I want it to come from a single outlet is because I can turn on all adapters at the same time from the switch on my power bar.
If this is not possible, can the adapters be spread out from different outlets and simply turned on by connecting or disconnecting the Arduino?
I've attached a primitive schematic I made to the best of my abilities. 
Best Answer
Canada uses 120V outlets. The amperage of the circuit is typically 15 or 20 amps. But that is at 120V. 12V 5A is provided after the power supply regulates the input down. Without taking into account efficiency, 12V 5A is the same power as 120V 0.5 Amps, or 60 Watts. Add in efficiency costs as no power supply is perfect, it's likely 0.6A input. Look at the label on your supply and it will tell you what the input amperage is. That's the amperage you need to worry about on your power strip/outlet/circuit.
If this is on a small localized display, you should consider using a 200 to 240 Watt 12V supply, like maybe a PC power supply. Less issues with multiple supplies.