SPRINKLER TALK FORUM - You Got Questions, We've Got Answers

I am a sprinkler guy trying to start some landscape lighting. My question is- I have a 900w transformer and an outlet to plug it into but in the past i have seen houses where the outlet(gfi) is for the transformer only and has its own breaker i was wondering if this is really neccesary or can i get away with the exsisting outlet outside the home

Thanks ,I think I will use the one already there. Thanks for the info usually i get a dumbass answer back like- GO read a light manual . Thank YOU