GFCI's
So there are 3 strings of lights?
Try switching the breaker on with 2 out of 3 strings plugged in, i.e one string unplugged..
THen change to another 2 out of 3 etc i.e another one unplugged.
If it still trips with 2/3 , it's leakage.
If it doesn't, it's surge current.
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