I am making an LED strip installation. I will be using 15 meters of APA102 LEDs. They require constant voltage, I believe. https://cdn-shop.adafruit.com/datasheets/APA102.pdf
I calculated that I need 23.4A at 5v, or around 120w. Adding 20% for safety, I figure I need a 150W 5v supply.
I will be buying a power supply from Digikey: https://www.digikey.ca/product-detail/en/tdk-lambda-americas-inc/LS150-5/285-1817-ND/1918828.
I will be running large wires from the power supply to each of the strips (ie in parallel), while running the LED strips' data lines in series. The Arduino will control the strips, and that will be powered by the supply as well (that should be fine, right?).
I will encase the power supply and Arduino in an aluminium encasement. This will hang from the ceiling outdoors, and be subject to low temperatures in winter (Canada). I am figuring on a temperature range of -10C to 30C. I will be testing it indoor at first, of course.
My confusion is with safety of the power supply. I am relatively new to electronics, and the high current and power makes me a bit nervous, so I want to verify things first.
I think that I need to hook up the live AC wire to L on the power supply, the neutral AC to N, and the ground AC to GND. I then need to hook up the Arduino and LEDs Vcc to V+, and Arduino/LED GND to V- (correct?).
The installation instructions from the power supply http://www.us.tdk-lambda.com/ftp/manuals/ls_manual.pdf states "This power supply has a possibility for hazardous voltage to appear at output terminal depending on the type of failure. The outputs of these products must be earthed in the end equipment to maintain SELV. If the outputs are not earthed, they must be considered hazardous and must not be made user accessible."
Would you be able to explain what this means I need to do? I have read quite a bit about this, and have an idea of what it means, but I want to be absolutely certain.
I think it means that I need to, in this situation, hook up V- to the AC GND. Do I have this correct?
Also, do I need to hook up the chassis of both the power supply and the encasement to GND?
Thank you for you help.
EDIT: Thanks for your answers. I found this series of articles that made things much more clear for me. https://www.acromag.com/white-paper-electrical-ground-rules
Also, I am still wondering how to verify that the PE and Neutral on the AC in my house are actually independent, up to the mains board. This is the best I have found: https://soundforums.net/features/192052-basic-receptacle-testing