Originally Posted by Tesla
The raw physics of current flow are not brought up to field electricians.


Then I am glad that I have an engineering degree which included a transformer design course.

To my knowledge shielding is not a normal feature in any standard 600V CT mounted in switchboard and switchgear.
The Emon CT is not encapsulated, effectively you can see the windings through the insulation just like in the OP.

I can not find a single CT application guide that tells about errors due to CT mounting, except for those concerning the winding distribution.

Please provide a reference from a CT manufacturer explaining this application consideration, otherwise it sounds like you are stretching your expertise in this area.

Here are links to CT design references.
http://www.mmgca.com/apps/MMG-ctdesign.pdf
http://library.abb.com/GLOBAL/SCOT/scot229.NSF/0cb8394a97bc4979c1256c6b004c4f2e/eb183a922d51bf17c12570ae004b5518/%24FILE/gan_pap.pdf

Your comment,
Quote
CTs don't push a lot of current, but they do have the potential to really pump up the voltage. If you're unlucky enough to have a CT crossing two -- out of phase AC conductors -- then its own (higher voltage) secondary is going to be seeing currents it's not designed to carry.
is almost incomprehensible. CTs are regularly applied where they surround out-of-phase conductors