Connection
6.1 Safety when connecting up
SCALANCE W1788-x / W1748-1
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Operating Instructions, 03/2022, C79000-G8976-C484-05
Safety information when using in accordance with UL 61010-2-201
If you use the device under UL 61010-2-201 conditions you must also keep to the
following safety notices in addition to the general safety notices for protection against
explosion:
NOTICE
Suitable fusing for the power supply cable
The current at the connecting terminals must not exceed 3 A. Use a fuse for the power
supply that protects against currents > 3 A.
•
In areas where NEC or CEC are used, the following requirements must be met:
–
Suitable for DC (min. 60 V / max. 3 A)
–
Breaking current min. 10 kA
–
UL/CSA listet (UL 248-14 / CSA 22.2 No. 248.14)
–
Classes R, J, L, T or CC
•
In other areas, the following requirements must be met:
–
Suitable for DC (min. 60 V / max. 3 A)
–
Breaking current min. 10 kA
–
Permitted for electric circuits according to IEC / EN 60947-1/2/3
–
Breaking characteristics: B or C for circuit-breakers or fuses
You do not need a fuse for the power supply cable if you use a voltage source according
LPS or NEC Class 2.
NOTICE
Protective ground
A PELV circuit contains a connection to protective ground. Without a connection to
protective ground, or in case there is a fault in the connection to the protective ground,
the voltage for the circuit is not stabilized (limited).
NOTICE
The "Limited Energy" circuit and other circuits must be separated by at least basic
insulation.