Ex I Applications - WAGO 750 Series Manual

Planning
5.5.2 Ex i Applications
Some I/O modules are intended to be connected with devices located in hazardous ar-
eas. To ensure safety and reliability in these applications, several additional requirements
must be considered:
• The node structure meets the additional requirements specified below for the power
supply as well as the requirements for air and creepage distances.
• The operator obtains a prototype test certificate that confirms the correct installation of
the system and store it in a control cabinet or housing.
Observe the detailed requirements as stated in the original wording of the respective cer-
tificate (Installation Regulations Specified by Approvals).
Power Supply Requirements
Only Ex i bus supply modules are permitted to be used for power supply to any node sec-
tions containing I/O modules for Ex i applications.
The following Ex i potential supply modules may be used for this purpose: 750-606,
750-625/000-001.
1
2
U
S
U
F1
U
F2
*)
750-606 with electronic fuse and diagnostics
750-625/000-001 with electronic fuse and no diagnostics
38 System manual | Version: 3.3.1
U U
S F1
Ex i bus supply module (750-606, 750-625/000-001)
Ex i I/O modules
System supply (24 VDC)
Field supply 1 (24 VDC)
Field supply 2 (24 VDC)
1
U
F2
Figure 19: Ex i Power Supply Concept
*
Serie 750, 753
2