A certificate for a safe becomes invalid if:

• The safes are not anchored: safes that carry a grade for burglary protection and weigh below 1000kg must be properly anchored to the floor or a wall, otherwise the classification is invalid.
• Unauthorized modifications are made to the safes. Changing the lock, adjusting the bolt work, replacing the seal or adding a deposit slot to burglary- or fire-resistant safes invalidates the certification. Therefore, product checks, maintenance and customization should be carried out by the original supplier or an accredited partner.
• The safes carry an insufficient lock grade. If a safe is certified for burglary protection, then the lock used on the safe must also be certified offering an equivalent degree of protection.

No, they are not. A burglary-resistant safe can give some protection against fire but only for a short time and at relatively low temperature, because the materials inside the walls act as insulators. A fire-resistant safe for documents or digital media should be correctly certified to ensure the right fire protection.