It is mandatory. It shall be with the product. It shall be considered while specification, design, installation, inspection, operation, maintenance and repair.
Deviation shall not be there to Ex certification of the related installation.
Most optimal if it is translated to the language of people on site understand. Always keep the original edition. in case of non.understanding always refer to original one.
If update is there, immediately it shall be communicated.
Manual is the responsibility of manufacturer. In case there is FFPA, repair or similar the relevance of it shall be sbj of validation.
Keep up good work!