SICK G20 Notice D'instructions page 31

5.2 Notes on UL approval
8026844.1K1V/2024-02-08 | SICK
Subject to change without notice
The electrical installation must only be performed by electrically qualified person‐
■
nel.
Standard safety requirements must be observed when working on electrical
■
systems!
Only switch on the supply voltage for the device when the connection tasks have
■
been completed and the wiring has been thoroughly checked.
When using extension cables with open ends, ensure that bare wire ends do not
■
come into contact with each other (risk of short-circuit when supply voltage is
switched on!). Wires must be properly insulated from each other.
Wire cross-sections in the supply cable from the user's power system must be
■
selected in accordance with the applicable standards.
NOTE
Layout of data cables
Use shielded data cables with twisted-pair wires.
■
Implement proper and complete shielding concept.
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To avoid interference, e.g., from switching power supplies, motors, clocked regula‐
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tors and contactors, always use cables and layouts that are suitable for EMC.
Do not lay cables over long distances in parallel with voltage supply cables and
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motor cables in cable ducts.
The IP enclosure rating for the device is only achieved under the following conditions:
The cables plugged into the connections are screwed tight.
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The terminal chamber has to be sealed according to the instructions for "terminal
■
connection".
If these instructions are not complied with, the IP enclosure rating for the device is not
guaranteed!
UL approval
Table 2: UL approval
G20 products with DC voltage supply and with:
• connector
• cable
•
cable with connector
UL:
The device shall be supplied from an isolating
transformer having a secondary overcurrent
protective device that complies with UL 248 to
be installed in the field rated either:
a) max 5 amps for voltages 0 V ~ 20 V (0 V ~
28.3 V peak), or
b) 100 / Vp for voltages of 20 V ~ 30 V (28.3
V ~ 42.4 V peak)
Alternatively, they can be supplied from a
Class 2 voltage supply.
UL Environmental Rating: Enclosure type 1
For use in NFPA 79 Applications only
OPERATING INSTRUCTIONS
O P E R A T I N G I N S T R U C T I O N S | GLD20
en
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