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Means of electrical noise suppression may be required to prevent radiation of RF noise. Such noise is caused
by transient peaks, which are transmitted by AC line or valve outputs, motor controls, etc.
Noise should be removed at its source. If this is not reasonable, noise suppression devices must be placed as
close as possible to device.
All inductive devices such as valves, solenoids, and other switching elements (or their connecting wires),
which are situated in the vicinity of control, require noise suppression or physical isolation with barriers.
6.3 Noise Suppression