Multicore screened cables

[mhoult]

Can anyone advise me if earthing a spare conductor in a multicore cable will casue me any concerns? The device is a PT having a 4-20mA signal. The screen is isolated at the device end.

Many thanks

 

[itsmoked]

Should cause no problems, especially if grounded at one end only.

Keith Cress
Flamin Systems, Inc.-

http://www.flaminsystems.com

 

[HCBFlash]

In my experience you're doing the exact right thing. Earthed spares and shield at the controller end of the cable, insulated ends at the device.

 

[waross]

What Keith said;- One end only.
respecfully

 

[mhoult]

I should have been a little more precise. What I want to do is remove the need for external earthing and use a triple with one of the cores being the bonding conductor. The screen/armour is on earthed at the control end, the device is also connected to pipework (which is earthed) and sometime a bracket (that is connected to the main skid). Lookind at all the EMC and bonding IEC's I cannot find anything that prevents this, although a BP specification states that usually both ends of a 'spare' core will not be earthed at each end. Shell and total are prety similar.

Your help is once again appreciated.