We can divide it up to two reasons:

• The First and most important it is the legal issue. If regulatory requirements aren’t met, then a manufacturer cannot legally sell the product in the country of intention. If a product owner/manufacturer doesn’t meet the requirements, the product will likely be removed from the market, fines may be imposed on the product owner, and prison time for owners and employees of the manufactureris a possibility.
• The Second, EMC testing can and will reveal potential design flaws within a product, where the manufacturer can make a product better. This can alleviate the need for costly recalls and design changes and the possibility to meet the time to market with the product.

So how do I move in this jungle of various standards and regulations?

Let’s say that your company has a product that utilizes digital electronics. Depending on where you intend to sell that product, you’ll need to meet regulatory requirements to ensure that the product isn’t going to interfere with other products, or that other products aren’t going to interfere with it. The three fundamental bricks what´s summarize EMC

• Product isn’t going to interfere with other products.
• Other products aren’t going to interfere with it.
• The product do not interfere with itself.

In the United States, the FCC is the government authority that enforces regulations, and the only thing that the US regulates is emissions. If you need to sell into Europe, then you’ll need to investigate testing under the EMC Directive (2014/30/EU) for compliance.