4. How to maintain and validate the system?

4.1 Maintain installed equipment

Once your equipment has been installed, it needs to be kept in perfect working order. Here are just a few of the most common mistakes you can make.

• The equipment has broken down and has been replaced by non-certified equipment: it is urgent to replace the non-certified equipment with certified equipment suited to the type of zone.

• The equipment has broken down and has been replaced by equipment not suited to the type of zone: here again, the equipment will have to be replaced, taking into account its category.

• The equipment is suitable for the gas zone, but not for the dust zone, or vice versa: this equipment cannot remain installed...