The other day a customer wanted a replacement for the round glass fuses. An exact replacement of this type. This was for a typical house hold and if memory serves me correctly it was 20 amp. I looked at her old fuse and saw that it said time delay, so that's what I sold her. My question, is a time delay fuse typical for a normal household use? I thought an instant blow would be more common. And why would a time delay be used in a household environment? [IMG]http://i.imgur.com/VTEXZJ3.jpg[/IMG]

While having my 200 amp service installed in my electrical shack, the head electrician pondered my options for the load side line. Drill a hole in concrete floor, or drill a hole in wall. We went with hole in wall, as I overdid it on rebar in concrete, and I was on a meager budget. He said if I installed a metal sweep in floor, life would have easier. Apparently, a PVC sweep is not acceptable. I asked why? He just said inspector said so. Ever since, it has bothered me. The load line is ACWU. What does it matter whether the sweep is plastic or metal going through concrete? The hole isn't going to change. The sweep isn't grounded. I'd have thought a plastic sweep safer...less chance for jacket on ACWU to get cut or nicked. I asked another electrician about it...no idea why either. Anyways, going forward, I will be building a garage-home, and will be bringing in ACWU from electrical shed. This time, I will put it through floor. I scored some metal 3" sweeps on the cheap, so all will be good. But I still would like to know why, from an educational perspective. Thx.