9 minutes ago, Abla2425 said:

Thanks for your comment al. Yeah got that as mentioned. Screen down one end. And terminated at 680. Really weird. They just come in and out for a couple of seconds literally. Going to check for induced voltage. 

Sorry what's that mean screen down one end ? Screen is your zero?

I think that means the Belden shield tied to the panel earth points at one end.

 

Is this happening on multiple busses ?

Any comm's device on bus 1 ?   

Are all the devices in 61.1.X sitting constantly at 100% ?

 

It does sound very much like induced voltages messing with the bus traffic.  You would expect to see the diagnostics showing a drop as the checksums get messed up though.

Hi Galaxy Guy. Thanks for the reply. Yes it’s in Beldon screened twisted pair. Unfortunately multiple busses. No Comms device (good old fashioned Redcare) and all look good in diagnostics. However, could dip, as mentioned it can sit fine for days. Even weeks sometimes. Think induced voltage is the best path to take. They did have instances of the AC passing 250vAC. Which I originally put the faults down to. However UKPN have monitored now and has been clear for some time, apparently.