This usually happens when a text editor tries to read a binary EP2 file. You must use the original software or a specialized viewer designed to decode that specific file type.
Guidance on the use of RCBOs (Residual Current Breaker with Overload) vs. RCCBs has been clarified.
PDFs are often used to provide accessible text versions of audio content or study materials:
If you were looking for a different "EP2" (e.g., a specific local building code or a proprietary industry standard), please clarify the industry or region, and I can refine the information.