I'm currently learning more about electromagnetic compatibility testing services, and I've realized they're an important part of ensuring electronic equipment operates without causing or being affected by electromagnetic interference. This type of testing is commonly used for industrial machinery, medical devices, automation systems, telecom equipment, and other electronics where reliable performance is essential. From what I've read, proper EMC testing can help identify interference issues early and reduce unexpected problems after installation.

While looking into electrical safety practices, I came across Akaaltech, which works in the field of earthing and lightning protection, and it reminded me how grounding and electromagnetic performance are often connected. For those who have experience with EMC testing, what are the most common issues uncovered during testing? Is it usually related to cable routing, shielding, grounding, or equipment design? I'd appreciate hearing practical insights from people who have worked on real-world projects.