![Beckhoff EL1052 Documentation Download Page 34](http://html.mh-extra.com/html/beckhoff/el1052/el1052_documentation_2719587034.webp)
Mounting and wiring
EL1052, EL1054
34
Version: 1.1
For devices with Ethernet connectors
Not for connection to telecommunication circuits.
Basic principles
Two UL certificates are met in the Beckhoff EtherCAT product range, depending upon the components:
1. UL certification according to UL508. Devices with this kind of certification are marked by this sign:
2. UL certification according to UL508 with limited power consumption. The current consumed by the de-
vice is limited to a max. possible current consumption of 4 A. Devices with this kind of certification are
marked by this sign:
Almost all current EtherCAT products (as at 2010/05) are UL certified without restrictions.
Application
If terminals certified
with restrictions
are used, then the current consumption at 24 V
DC
must be limited
accordingly by means of supply
• from an isolated source protected by a fuse of max. 4 A (according to UL248) or
• from a voltage supply complying with
NEC class 2
.
A voltage source complying with
NEC class 2
may not be connected in series or parallel with another
NEC class 2
compliant voltage supply!
These requirements apply to the supply of all EtherCAT bus couplers, power adaptor terminals, Bus
Terminals and their power contacts.
Summary of Contents for EL1052
Page 2: ......