Commissioning
CX52x0
37
Version: 1.0
6.2.2
UL requirements
The CX52x0 Embedded PCs are UL-certified. The corresponding UL label can be found on the name plate.
Fig. 24: UL label on CX52x0.
The CX52x0 Embedded PCs can thus be used in areas where special UL requirements have to be met.
These requirements apply to the system voltage (Us) and the power contacts (Up). Applications without
special UL requirements are not affected by UL regulations.
UL requirements:
• The Embedded PCs must not be connected to unlimited voltage sources.
• Embedded PCs may only be supplied from a 24 V DC voltage source. The voltage source must be
insulated and protected with a fuse of maximum 4 A (corresponding to UL248).
• Or the power supply must originate from a voltage source that corresponds to NEC class 2. An NEC
class 2 voltage source must not be connected in series or parallel with another NEC class 2 voltage
source.
Fig. 25: Connection example for areas with special UL requirements.
