Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [hazardous-areas]

For electrical installations in hazardous areas, where there is a risk of fire or explosion due to flammable gases, liquids, or dusts.

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Microwave starts working when door opens - how dangerous is it?

I've just rented a house that came with an equipped kitchen, and I've found that the microwave has a rather weird behavior - opening the doors seems to trigger it to start working, which the owners claim "has always been like that". Yet, I've been…
joaocandre
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Dangerous step potential with low (line) voltage possible?

I've always read about step potential in terms of substations and high voltage powerlines, where we are talking in the kilovolt+ range. What if there is a manhole cover and a mains(240V/400V) wire touching it and making it live? Given that the…
alex.b.bg
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Flammability of Silicone Sealants with Electronics

I'm aware that electronics grade silicone rubbers exist but I've also read in a particular post on here that common silicone rubber sealants can also be used for electronics, providing that they're neutral cured and not acid cured. I'm working on a…
Seano
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Coin battery for powering the RTC while MCU power down: is safe for ATEX ZONE 2 or DIV2 in hazardous environment? The Box is heavy duty IP67 sealed

I wish to use RTC which keep powered by a coin battery (i.e. CR1225) while disconnected from +5V power. The box is heavy aluminum diecast with IP67 sealed. I was concerned about using coin batteries (non-recharagable) within Div2 or Atex Zone 2…
Riscy
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Is an unenclosed cable modem circuit board a fire hazard?

I've come up with a clever hack to save space and reduce # power adapter eye sores by bolting my cable modem (Netgear CM500) under the Wifi router (WRT 3200ACM). The heat sink over the Broadcom baseband processor is very hot to touch. I measured…
Yale Zhang
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ATEX - Infallible Current limiting resistors

I'm preparing an intrinsically safe electronic board according to 60079-11. In this standard film type resistors are accepted as infallible current-limiting resistors, which means that that they fail only to an open circuit. In my opinion "film…
MatD
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Is the voltage / power running through an exposed Bluetooth keyboard enough to be hazardous?

Unusual question and potentially not the right forum for it. Apologies in advance. In short, I have cracked the shell off a Bluetooth keyboard and modified it (read: Jerry rigged it) to be as light as humanly possible while still functional to type…
Pythonista
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Is a non-isolated power supply a good/safe option for "inside the case" Arduino / ESP01 / ESP32 / whatever control using the appliance's PS?

I throw this highly important question, and refer you to my other threads in which I tackled this myself (learnt a WHOLE lot, and VERY important stuff indeed, could literally avoid you DYING from doing Arduino projects! ....) (PS- many thanks to…
mosagepa
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60079-11 / 7 PCB layout design rules

Is there a PCB guideline paper or book that discusses how to design PCB layout and components that meet IEC60079 (-0, -11, -7) and how to limits the use of encapsulation or conformal coating. In my case, I have an off shelve certified Zener barrier…
Riscy
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