EEMO1 said:
old topic, BUT...
Is it legal, to sell a pre-build custom units with a power supply without these certifications, inside the EU?
You need CE certification if you want to be legal.
I've done a lot of CE self-certification. The person who signs the CE cert is legally accountable for it.
There is a lot of confusion about the CE cert.
You need your equipment to be in accordance with CE60065, which is the low-voltage safety regulation. It's not very complicated, just good practice and good sense. That's all about the fuse(s) protecting the Live conductor, the earthing point, isolation clearance, absence of holes where one could put his fingers or a metal rod and get electric shock, temperature less than 50°C, and so on. You may want to buy the document; that would cost you about 60 quid. It tells you how they test things; you will see that it's not very complicated, in fact most of the test is visual.
The rest is about interference. Your product should not generate interference, either radiated or conducted superior to a specific amount.
Any piece of gear that has no SMPS, high-speed logic or radio-transmitting capability, except power amplifiers passes easily the test.
If one uses a 3rd-party CE-approved SMPS, they must be an idiot not succeeding in test. Just common sense and good practice are needed.
Now, your product should tolerate a certain amount of incoming interference. The worst case is for digital products that actually reset or reboot when submitted to interference, but in most cases, like a purely analog product, you just have to mention in the self-cert file (and in the manual) that performance may be degraded in case of heavy interference.
Im not really worried about the build quality when looking at some products, but for example how do the insurance companies react to these if something goes south?
You don't really need to do the full CE certification for that. (but you need the global CE cert in order to sell your gear) If you're worried about safety, you could have your equipment tested just for CE60065. It's a less costly test than the whole interference shebang.
But if you are confident you have done your homework well, you can do the self-cert.
CE certification was a very traumatic experience in 1992; when you talked to a cert house, they would quote outrageous money and tell you that you had to go through them, which was more or less true for the computer or broadcast industry, but it turned out that it's much easier than you would think. Turned out we had only two pieces of gear tested - one that was the most complex of the mains-powered units and a DI box. We signed the self-cert for the whole catalog on account these two units covered all variations.