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<blockquote data-quote="IzzyS" data-source="post: 390287" data-attributes="member: 11110"><p>If the automation kit signalling is SELV then it should really be separated from the power (LV) for safety and compliance with BS7671, as well as for avoidance of this problem. </p><p></p><p>Could be any number of reasons why only some are affected - component tolerance, quality of manufacture, position on the wire (now acting as an incorrectly terminated transmission line for the induced noise), The only way to find out is to monitor the control lines with a 'scope and see what's happening. Probably quicker and easier to run a separate screened control cable?</p></blockquote><p></p>
[QUOTE="IzzyS, post: 390287, member: 11110"] If the automation kit signalling is SELV then it should really be separated from the power (LV) for safety and compliance with BS7671, as well as for avoidance of this problem. Could be any number of reasons why only some are affected - component tolerance, quality of manufacture, position on the wire (now acting as an incorrectly terminated transmission line for the induced noise), The only way to find out is to monitor the control lines with a 'scope and see what's happening. Probably quicker and easier to run a separate screened control cable? [/QUOTE]
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