Note:
• Leave the other ends of the control cable shields unconnected or ground them
indirectly via a high-frequency capacitor with a few nanofarads, eg, 3.3 nF / 630 V.
The shield can also be grounded directly at both ends if they are in the same ground
line with no significant voltage drop between the end points.
• Keep any signal wire pairs twisted as close to the terminals as possible. Twisting
the wire with its return wire reduces disturbances caused by inductive coupling.
196 Electrical installation – North America
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