We all purchase Ex installations, and we specify, design, install, commission, operate, maintain and repair it according to:

• Manufacturer's Ex certification, manual and list of accessories
• Functionality
• hazardous area classification
• explosion protection documentation / Verification Dossier

As long as we take them 1:1, no problem.

BUT if we do any modification related to:

• Ex protection
• Functionality
• List of accessories
• Manual
• ...

We immediately may become a manufacturer of that one piece of Ex installation.

Follow up is simple I have to behave like a manufacturer, there is a need for:

• Ex unit/type certification
• Own declaration of Conformity
• Own manual
• List of accessories
• Own label
• ...

Make sense to avoid becoming a manufacturer.

Keep up good work!

Ps.: if there is a Ex service facility, we might have another option...