Key points in this article
Line One Is the Device
Compliant equipment with leakage, over temperature, and auto stop protection forms the first wall against electrical faults that could otherwise ignite quickly and without warning. The pile that refuses to overcharge is the silent guardian working every session, and its discipline is what the other two lines exist to back up when it is eventually tested.
Line Two Is the Site
Sensible siting, ventilation, and separation keep a fault from reaching people, vehicles, or neighboring structures in a dense residential building cluster nearby. A safe device in a dangerous place is still a danger, so the location is engineered with the same seriousness as the electronics buried inside the casing.
Line Three Is the Response
Fast detection and emergency cut off ensure that when something slips past the first two lines, damage stays bounded and brief rather than catastrophic. Jinan stresses all three must hold, because a strong device cannot compensate for a neglected site or a slow response that lets a small fault become a large one.