WAGO 750-537/040-000 Manual

54 Use in Hazardous Environments WAGO-I/O-SYSTEM 750 XTR750-537/040-000 8DO 24 VDC 0.5A Diagn XTRManualVersion 1.1.1Explosive atmosphere occurring simultaneously with assembly, installation orrepair work must be ruled out. Among other things, these include the followingactivities• Insertion and removal of components• Connecting or disconnecting from fieldbus, antenna, D-Sub, ETHERNET orUSB connections, DVI ports, memory cards, configuration andprogramming interfaces in general and service interface in particular:• Operating DIP switches, coding switches or potentiometers• Replacing fusesWiring (connecting or disconnecting) of non-intrinsically safe circuits is onlypermitted in the following cases• The circuit is disconnected from the power supply.• The area is known to be non-hazardous.Outside the device, suitable measures must be taken so that the rated voltage isnot exceeded by more than 40 % due to transient faults (e.g., when powering thefield supply).Product components intended for intrinsically safe applications may only bepowered by 750-606 or 750-625/000-001 bus supply modules.Only field devices whose power supply corresponds to overvoltage category I orII may be connected to these components.