Hi, first time here and boy am I happy I found this forum. I have a question regarding fuse sizing I was hoping someone could enlighten me on. I know that fuse amp sizing should about 20% higher than normal load in most cases. In my case I am running a 1000W hot tub heater to heat a 300 gallon fish quarantine tank for a sick fish (long story here). The circuit this heater is plugged into is 20A/115V. Based on the 1000W heater rating the draw at a full power will be 8.7 amps. The closest size fuse I could find in a 10A fuse which is about .5A lower than the 20% buffer. I'm using AGC fuses.
My question is is only a 15% buffer ok? I'm actually fine with it blowing a little sooner in a short situations as long as I'm not having to replace the fuse every week because of power fluctuations.
My question is is only a 15% buffer ok? I'm actually fine with it blowing a little sooner in a short situations as long as I'm not having to replace the fuse every week because of power fluctuations.