3 ms·
Yet there seem to be no designs with any ventilation. Why is that? Are heat sinks not allowed because the case is (usually) not grounded?
by solarkraft 7y ago
Yet there seem to be no designs with any ventilation. Why is that? Are heat sinks not allowed because the case is (usually) not grounded?
- lloeki 7y agoUseful ventilation means holes through which someone could insert a thin metallic part (wire, needle...) Never underestimate the ingenuity of fools. The safest design is one without holes.
- dogma1138 7y agoYou don’t even need people inserting anything. Dust is a problem on its own it can ignite from ESD and the charing causes carbon built ups that eventually cause a short. Even when it doesn’t ignite from ESD it can change the capacitance of circuits which can cause a flash. This is compounded even more by the fact that many dust particles in cities can be conductive carbon particles form combustion, platinum and other metals form catalytic converters and fine metal particles from things like car brakes, roads and wheels are all over the place. A lot of that black/dark grey dust that can settle around windows and other leaky parts of your house in a city isn’t dead skin and dirt.
- occamrazor 7y agoThe general rule is that on the mains side one needs either grounding and single insulation, or no grounding and double insulation. In Europe (except UK and Ireland) there us the Europlug standard plug with two prongs, that works everywhere, but no single standard three-pronged plug with grounding. For economy if scale and simplicity of logistics, double insulation is the best option, but as you note it makes a heatsink less practical.