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I have completed the design of a circuit board where the mains 240V can be connected with screw terminals. This is just a sub-assembly unit. This would normally be used in industrial environment.

Are there any kind of certifications needed for selling such unit that uses these 'high' voltages? How is the safety aspect of the product covered?

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    \$\begingroup\$ What country it will be sold in is important. \$\endgroup\$
    – Mattman944
    Commented May 27, 2019 at 16:08
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    \$\begingroup\$ I would say that some certification will be needed for most countries. \$\endgroup\$
    – Eugene Sh.
    Commented May 27, 2019 at 16:12
  • \$\begingroup\$ Certainly the box it goes into will need to be certified in most places. As already stated, whether the board does varies from country to country. Plan on at least some redesign if you weren't designing it from the ground up to pass certification. \$\endgroup\$
    – TimWescott
    Commented May 27, 2019 at 16:14
  • \$\begingroup\$ This will be for the United Kingdom. \$\endgroup\$
    – Noel
    Commented May 27, 2019 at 16:14
  • \$\begingroup\$ Also there will be no box. The client will only buy the assembled PCB. \$\endgroup\$
    – Noel
    Commented May 27, 2019 at 16:18

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A sub assembly does not need to be certified, but the final equipment does need to. This means that your board also needs to comply to at least LVD, EMC and RoHS directives. If it violates those, the final equipment will fail the certification tests.

The low voltage directive and its harmonized standards cover the safety issues you need to consider

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  • \$\begingroup\$ EMC is highly dependent on how the system as a whole is put together, hard to certify that for a subassembly except under specific conditions.... Same thing goes for SOME bits of the LVD. Now if you sell a subassembly and it turns out to be impossible for the system integrator to get the system to pass because of something stupid your board does, well, they going to be pissed, but I don't believe there is actually a CE issue on your board as such. \$\endgroup\$
    – Dan Mills
    Commented May 27, 2019 at 22:20
  • \$\begingroup\$ Yes, it is not illegal to sell such a board. Just bad for business. \$\endgroup\$
    – TemeV
    Commented May 28, 2019 at 5:46

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