The shutter prevents someone (including children) shoving something metal into the live/hot. I have never heard of it failing. Newer US outlets (TR/tamper resistant) are way more finicky because of the optional ground pin. Sticking the little plastic covers over the outlet is a workaround.
The reason for a fuse is because of the high current capacity of ring circuits vs branch/radial. The fuse protects the power cable of appliances catching fire as they can’t handle the current available on the circuit .
Ring circuits are a thing due to minimizing copper usage when rebuilding after ww2.
The reason for a fuse is because of the high current capacity of ring circuits vs branch/radial. The fuse protects the power cable of appliances catching fire as they can’t handle the current available on the circuit .
Ring circuits are a thing due to minimizing copper usage when rebuilding after ww2.