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18 © Festo Didactic 8129444
6 Safety sockets
Unless otherwise indicated in the technical data, the following color coding applies to supply and signal
connections on components of the Festo Didactic Automation and Technology Learning System.
Color Meaning Color Meaning
Voltage greater than safety extra-low voltage
E.g. mains voltage of 90 to 400 V AC per conductor
Mains conductor L1
(gray-brown)
24 V DC
(red)
Voltage greater than safety extra-low voltage
E.g. mains voltage of 90 to 400 V AC per conductor
Mains conductor L2
(gray-brown)
0 V DC
(blue)
Voltage greater than safety extra-low voltage
E.g. mains voltage of 90 to 400 V AC per conductor
Mains conductor L3
(gray-dark gray)
Safety extra-low voltage,
Signal input/output
(black)
Voltage greater than safety extra-low voltage
E.g. mains voltage of 90 to 400 V AC per conductor
Mains conductor
(gray)
Neutral conductor
(grey-blue)
Grounding conductor, configuration as 4 mm safety
socket
(green-yellow)
Protective grounding terminal as PE+ contact, delivery
status
(green-yellow)
The component might not include all of the safety sockets shown above. Further safety
sockets may be included in the circuit setup due to using different components.
The specified protection classes and safe use will be achieved if laboratory safety cables supplied by Festo
Didactic are used.
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