How does EPS shielding layer breakage affect EMC?

break in the shielding layer of an EPS cable or cabinet (including electrical discontinuities) can severely compromise its shielding effectiveness, negatively impacting EMC:

1. Sharp drop in shielding effectiveness: The break becomes a "window" for electromagnetic wave leakage, allowing external interference to easily enter and internal noise to easily radiate out, especially at high frequencies.

2. Enhanced antenna effect: A broken shield may form a more complex antenna structure, resulting in stronger radiation or reception at certain frequencies.

3. Disruption of common-mode return path: For double-grounded shielded cables, a break interrupts the low-impedance metallic return path designed for common-mode noise, forcing noise currents to seek alternative paths (such as through signal lines or space), significantly increasing conducted and radiated EMI.

4. Potential introduction of new coupling: Gaps at the break may become channels for electric field coupling.

Therefore, the continuity of the shielding layer must be ensured during installation and maintenance, and any joints or transitions must have their shielding restored.