My late grandmother ran a grocery store in Buffalo from the late 1940's to the late 1960's. Between all the coolers, deli cases, and lights, she found a way to keep the fuses from blowing: use 30A fuses. As a kid, I remember a few of my aunts having frequent heated arguments with her about how she's going to burn the place down sooner or later. It never bothered her! The ironic twist: In the late 1980's, long after she had given up the business, but still lived upstairs, a car crashed into the building, setting it on fire. Miraculously, the fire department got her out, and put out the fire before it spread much beyond that corner of the building where the car entered.