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Only use provided knockouts when feeding wires and cables into the enclosure. Any added holes in the enclosure may allow unwanted electromagnetic interference to enter the enclosure and cause unpredictable issues.
Use appropriate cable clamp connectors or metal conduit at all knockouts. This will help secure and protect wiring.
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Typically, locations such as equipment closets and factory floors are electrically noisy environments. Electrical noise, either radiated or conducted as electromagnetic interference Electromagnetic Interference (EMI), can disrupt the operation of other electrical equipment. Shielded cable is good protection against the effects of EMI.
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Cables come with various degrees of shielding and effectiveness. The amount of shielding is dependent on the environment the cable that is being used.
Levels of protection offered by shielded cable:
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The AC power wiring to the DC power supplies supply consist of the AC LINE (L), AC NEUTRAL (N), and SAFETY GROUND (G). These AC lines connected to the panel must NOT be interchanged.
Interchanging AC LINE and NEUTRAL could expose the DC power supply to the hot side of the AC supply even when the AC LINE has been switched off.
Interchanging the AC LINE and SAFETY GROUND could energize the case and cause a lethal shock.
Interchanging the AC NEUTRAL and SAFETY GROUND could cause ground currents to flow through unintended ground paths, causing unpredictable/improper system operation.
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Wiegand Reader wiring can be sensitive to electromagnetic interference so it is recommended to use a good quality shielded cable.
Strip only enough of the cable jacket and shielding to allow for proper wiring of the connector.
The shield foil/braid should be stripped to the same length as the cable jacket.
The shield wire should be stripped to the same length as the signal conductors.
It is recommended to only terminate the shield at the panel and not at the reader.
The shield wire should be terminated along with the reader ground at the provided ground terminal of the Reader connector.
If the Wiegand reader has an available drain connection, connect the drain line to the cable shield otherwise only connect the cable shield at the controller.
Ensure exposed shield wire does not come into contact with any other shield wires, the metal enclosure, or any other metallic surfaces.
Shrink tubing can be used on exposed shield wire to ensure unwanted contact with metal surfaces.
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Example of RS-485/OSDP wiring with RREB shield termination
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Example of OSDP shield termination at MATCH connector
RS-485/OSDP Reader wiring can be sensitive to electromagnetic interference so it is recommended to use a good quality shielded cable.
Strip only enough of the cable jacket and shielding to allow for proper wiring of the connector.
The shield foil/braid should be stripped to the same length as the cable jacket.
The shield wire should be stripped to the same length as the signal conductors.
It is recommended to only terminate the shield at the panel and not at the reader.
The shield wire should can be terminated along with the reader ground in the provided location of the RS-485/OSDP Reader connector.
Another option to terminate shield wire would be to terminate the shield wire at an unused MATCH shield terminal as shown above. Ensure the exposed shield wire is covered with shrink tubing.
Ensure exposed shield wire does not come into contact with any other shield wires, the metal enclosure, or any other metallic surfaces.
Shrink tubing can be used on exposed shield wire to ensure unwanted contact with metal surfaces.
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Scramblepad wiring can be sensitive to electromagnetic interference so it is recommended to use a good quality shielded cable.
Strip only enough of the cable jacket and shielding to allow for proper wiring of the connector.
The shield foil/braid should be stripped to the same length as the cable jacket.
The shield wire should be stripped to the same length as the signal conductors.
It is recommended to only terminate the shield at the panel and not at the reader.
The shield wire should be terminated at the controller using the dedicated shield connection of the Scramblepad connector. The Scramblepad side of the cable shield should be left unconnected.
Ensure exposed shield wire does not come into contact with any other shield wires, the metal enclosure, or any other metallic surfaces.
Shrink tubing can be used on exposed shield wire to ensure unwanted contact with metal surfaces.