I am in heating and installing lots of Open Therm controllers. The cable that sends the data to & from the boiler - room stat is easily corrupt by spurious 'stuff' and one remedy is to use screened CY cable. I know to only earth the screen at one end but is there a neat prefered way of earthing it? It looks a right mess having un-platted it & rolled it up to put in an earth terminal? I have used earth sleeveing & ferules but it isnt always possible to use ferules? Any tricks of your trade out there?