At this time I have 4 20 amp breakers that feed 4 outlets. From these outlets I run multiple extension cords (Main Feeds of 10 guage wire). From these main extension cords I will breaker it down into more extensio cords to go to the different parts of the yard. I live in Alabama and our winters are WET so EVERYTHING GETS TAPED and I try and keep everything off the ground. You will need to determine how much current is going to each set of lights and get an idea of what type of demand you are putting on the circuits. An example here is the mega tree. My mega tree will pull 30 amps if all lights are turned on. The thing is this almost never happens and I have told my wife who does the sequencing that she can only work one color at a time. I think last year for 1/10 of a second I let her light the entire tree which brings me how a breaker works.
Think of breaker as a little heater that is heated up by all the current you use. If you run close to max a lot this tthing becomes very close to popping. If you are easy on the current demand and are lower you can toss in a rare spike of current. Have you ever seen what happens to the lights when someone turns on a table saw. The lights dim becuase of this HUGE demand for current by the saw. If the saw fails to come up to speed the breaker will pop. You have the same thing here. You can toss in spike every once and awhile but each time you do it you are pushing you luck and pumping up that heater. So be reasonable and keep the average demand on your breakers and extension cords to somewhere around half of what they are rated and you'll be able to toss that 1/10 or 2/10 second burst at the end of a song.
hopefully this helped instead of making it more confusing.
When it comes to GFI they are a pain in the butt but they will also protect you
here is a link to a video that will help you install a GFI outlet . NOTE they show you how to put it inline so one outlet will control many outlets down the line.
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