3 Safety instructions3.3 Mandatory requirements, personnel requirements14 XP-503 12/2014 MN048014-EN www.eaton.com3.3.6 Prerequisites for proper operationIn order for the device to be able to meet the contractually stipulated terms, the following must beobserved: Only qualified personnel should be allowed to work with the device. The personnel working with the device must have read the manual and must follow all theinstructions in it. The required ambient conditions must be met. Maintenance work must be carried out correctly. Potentially explosive atmosphere, Zone 22:The ground resistance of accessible metal parts must be less than 109 ohms.We assume no liability for damages, consequential damages, and/or accidents caused by thefollowing: Failure to follow occupational health and safety rules and standards Device failures or function disturbances Improper use and/or handling Failure to follow the instructions in this manual Alterations, changes, and repairs to the device For more information on repairs, please refer to chapter 6.3.1, "Repairs".