My question is what is the industry recommended practice for the following:
I have a waste water process site, The site consists of 3 MCC's fed from there own dedicated 11kV:0.4kV transformer. The site has its own 11kV network.
The majority of the process pipe work is located externally, Each system can consist of pumps and 400V actuated valves which are mounted in the pipework. Some sections of the pipework are buried in the ground.
Can the pipework be considered as extraneous conductive part or an exposed conductive part due to the connection of the 400V pumps and valves. Is there any consideration to connecting all three LV Systems earthing systems together by the addition of any bonding conductors. The pipework may already be doing this.
Reading the guidance notes 8 on earthing and bonding it not 100% clear as it doesn't really cover industrial process installations. Any information would be greatly received.
Thanks
Jason
