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beh. these aren't high voltage transformers or anything. you can buy diy "mains voltage" equipment at any hardware store. no one is shouting from the rafters "y

beh. these aren't high voltage transformers or anything. you can buy diy "mains voltage" equipment at any hardware store. no one is shouting from the rafters "you REALLY shouldn't buy that!"

crote 3y ago
Correct, but those are pre-built parts which have been certified. They are designed to be safe, even when mildly mishandled. Plugging in a toaster or installing a wall socket is indeed pretty safe. In this project, on the other hand, you are building something new which will handle mains voltage, using the cheapest parts you can find on AliExpress. It's not designed to be safe, and it's definitely not certified or even tested. That's not something you should do without doing a loooot of research first.
- newzisforsukas 3y ago
  > you are building something new which will handle mains voltage, using the cheapest parts you can find on AliExpress This seems like an invented argument. Many relays you find on amazon and similar marketplaces are CE or likewise rated. Add a quick blow fuse to the circuit if you are skeptical of the thresholds. I would also say if you sat through a primary school science curriculum, it doesn't take a "loooot of research" to understand the basics of residential electricity. Fifteen year old students learn it in vocational technology courses.
  - crote 3y ago
    > Many relays you find on amazon and similar marketplaces are CE or likewise rated. The tutorial got them from AliExpress. The links are long-dead, but if they have any ratings they are almost certainly fake. Also, CE ratings apply to finished products - they don't make sense for individual parts. > Add a quick blow fuse to the circuit if you are skeptical of the thresholds. ... which the tutorial didn't do. > I would also say if you sat through a primary school science curriculum, it doesn't take a "loooot of research" to understand the basics of residential electricity. Fifteen year old students learn it in vocational technology courses. That's the problem: this isn't basic residential electricity! You're building a new device, without all the mandatory safety precautions you'll find in off-the-shelf products. The most dangerous part is that at first glance it looks fine, while it's actually violating some quite basic design rules.
    - newzisforsukas 3y ago
      > Also, CE ratings apply to finished products - they don't make sense for individual parts. UL and CE guidelines definitely apply to things like relays, bulbs, wire, etc.

beh. these aren't high voltage transformers or anything. you can buy diy "mains voltage" equipment at any hardware store. no one is shouting from the rafters "you REALLY shouldn't buy that!"

crote 3y ago

Correct, but those are pre-built parts which have been certified. They are designed to be safe, even when mildly mishandled. Plugging in a toaster or installing a wall socket is indeed pretty safe. In this project, on the other hand, you are building something new which will handle mains voltage, using the cheapest parts you can find on AliExpress. It's not designed to be safe, and it's definitely not certified or even tested. That's not something you should do without doing a loooot of research first.

newzisforsukas 3y ago
> you are building something new which will handle mains voltage, using the cheapest parts you can find on AliExpress This seems like an invented argument. Many relays you find on amazon and similar marketplaces are CE or likewise rated. Add a quick blow fuse to the circuit if you are skeptical of the thresholds. I would also say if you sat through a primary school science curriculum, it doesn't take a "loooot of research" to understand the basics of residential electricity. Fifteen year old students learn it in vocational technology courses.
- crote 3y ago
  > Many relays you find on amazon and similar marketplaces are CE or likewise rated. The tutorial got them from AliExpress. The links are long-dead, but if they have any ratings they are almost certainly fake. Also, CE ratings apply to finished products - they don't make sense for individual parts. > Add a quick blow fuse to the circuit if you are skeptical of the thresholds. ... which the tutorial didn't do. > I would also say if you sat through a primary school science curriculum, it doesn't take a "loooot of research" to understand the basics of residential electricity. Fifteen year old students learn it in vocational technology courses. That's the problem: this isn't basic residential electricity! You're building a new device, without all the mandatory safety precautions you'll find in off-the-shelf products. The most dangerous part is that at first glance it looks fine, while it's actually violating some quite basic design rules.
  - newzisforsukas 3y ago
    > Also, CE ratings apply to finished products - they don't make sense for individual parts. UL and CE guidelines definitely apply to things like relays, bulbs, wire, etc.