4 ms·
It's a theoretical benefit even with radial wiring, I think, for some smaller devices. A lamp that's designed to draw an amp will have a small, low-current flex
by pmyteh 2y ago
It's a theoretical benefit even with radial wiring, I think, for some smaller devices. A lamp that's designed to draw an amp will have a small, low-current flex which will fail before the main circuit breaker trips (while a 3A fuse would have protected it).
In reality I don't think it matters, and even on a ring main the MCBs often trip before the device fuses blow these days.
- Ekaros 2y agoYou could always include those inside the devices. No need to have them in plug. Probably would be even better. Replacing such fuse would also lead to checking what was wrong with the device.
- ndsipa_pomu 2y agoIf you have the fuse inside the device, then damage to the cable could cause a short circuit and potentially start a fire. Having the fuse in the plug means that a short circuiting cable will just blow the fuse in the plug instead.
- 112233 2y agoThat's why the other end has MCB/RCBO/AFDD. Harder to catch is overheating due to overload or degraded contacts or wires (soviet aluminum wires, oh yeah). In case of brittish ring circuit, there is added fun case of ring disconnecting in the middle, effectively halving cable cross section