Specifications

25
Schneider Electric
Implementation guidelines (continued)
How should the shielding be connected?
A secure connection of the shielding to a cable gland in the enclosure wall is the best
solution, as long as the paint is scratched on the enclosure to guarantee good
electrical contact.
A U-shaped clamp can also be used to guarantee at least 180° contact.
If a U-shaped clamp cannot be used to ground the shielding when connecting to a
screw-type terminal, the grounding wire should be as short as possible. This type of
connection should be avoided.
High frequency protection depends directly
on how cable shields are connected.
If a "pig-tail" or long wire is used for
connection, protection provided by
shielding will drop sharply at high
frequencies.
E52294E52285
Poor
Ground bar
Potential reference plane
Fair
Good
Excellent
YES
NO
Ground bar
Okay for very
short links
Ground terminal with metal attachment and DIN rail
If a connector is used, it must provide a
360° electrical continuity between the cable
shielding and the equipment ground.
E52296
Connector with grounding spurs
Contact
between screen
shells
Cabling Guidelines