| Electronics > Beginners |
| What's the most dangerous failure's these days ? |
| << < (3/7) > >> |
| ejeffrey:
Hmm. I know one person who burned down his garage with lithium ion batteries, but that was some DIY thing, not consumer electronics so it was likely his fault. I know one guy who had substantial heat damage to his kitchen cabinets and floor when the SSRs in his oven failed short-circuit while he was on vacation, probably due to lighting or other surge. My brother also had his oven spontaneously fail on but he was home and able to flip the shut off the breaker before it did any damage. Counterfit / knockoff / cheap power supplies are also likely a big factor. I used to work in a university that had a whole batch of computers with ATX power supplies with no fuse and under-rated rectifiers that tended to fail and throw breakers. DIdn't cause any damage other than turning out the lights. |
| Berni:
Wait ovens use solid state relays for all of the heating elements? I know id really prefer a clunking power switch there, at least on the heater selection knob. |
| Siwastaja:
Mechanical relays fail short as well. Both types can be high quality & dimensioned properly so that the failure is very unlikely. The correct way to deal with the residual risk is thermal fusing. |
| Berni:
Well yeah i have seen relays fail short but its usually upon turning on under heavy load. But i have yet to see any of these big high power rotary switches fail short (That's what is commonly used to select between heating elements in ovens). Usually in those the contacts close under spring force and are pulled apart by the mechanical motion of the knob, so even if they lightly weld together there is a lot of force available to pull them apart upon the next switching operation. Tho i do agree that its a good idea to have a non resetable thermal fuse in there in case the temperature regulation fails. The old ovens have a bitmetal switch and those could certainly weld (Tho i never seen it happen luckily). But at least it wouldn't turn on by its own, only go out of control once turned on by the user. |
| Psi:
Main issue I encounter is pcb assemblers using non genuine parts in critical sections. Even when told that the part must be genuine |
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