From my very limited electrical knowledge the most important factor to consider is amperage for the entire circuit. Most household electrical circuits are on 15A breakers (10A on older systems). So what you do is you find out which plugs/lights/appliances are hooked up to that circuit your aquarium is hooked up to - shut off that circuit at the service panel and go around the house checking - then add up the amps of any device that runs off that circuit. If you are anywhere near 15A then you're pushing your luck.
Things such as MH lights, heaters and big stereos use big amps so if your aquarium, home entertainment center and computer are all hooked up on the same circuit it's bad news.
Running everything off of one circuit should be avoided if possible. Aside from taxing the circuit, any failure of one item can lead to the whole circuit tripping shutting down everything in the tank.
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