Wrapping power cords and interconnects with copper foil.

Can’t say I have seen, ever used, unshielded phono interconnects from the TT to the phono preamp.

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@tubelvr1 said:

@carlsbad2 no didn’t ground it, just wrapped it with self adhesive foil. Seems to work wonders.

It doesn’t need to be grounded to work as a shield, Faraday Cage. You might want to experiment, then listen for any differences.

You may find ungrounded sounds better. Especially on the AC power cord. It really depends on the equipment the power cord is feeding.

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@richardbrand Said:

Consider whether the RFI carried by power cords is actually generated by the components they power, not by the wall supply!  Much more plausible ...

Agree.

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Iconoclast paper

ICONOCLAST will use double ground interconnect shields and proper DCR RCA grounds.
Power Cables should also use grounds at BOTH ends if you have a proper GROUND plane
resistance such that ZERO current flows and thus you have ZERO induced voltage from
differential current.

If I understand correctly "Power Cables should also use grounds at BOTH ends" that means the shield should be connected to the EGC (Equipment Grounding Conductor) at both ends of a power cord. That’s not a good idea, IMO. Doing so puts the shield in parallel with the EGC. In the event of a Hot to chassis/EGC ground fault event a lot of current would travel on the drain wires/shield. In the event of a bolted ground fault ahead of the AC Line fuse possibly hundreds of amperes could be at play before the circuit breaker, hopefully, trips open. The EGC will carry more current because of its lower resistance/impedance but the drain wires/shield will carry far more than it is capable of handling.

From what I have read over the years the shield should be connected to the male plug end. The AC mains power source end.

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@mitch2 said:

Are you assuming the shield is acting as the ground?

Not assuming, Stating a fact... IF it is connected at both ends with the EGC, (Equipment Grounding Conductor). (Therein male plug end and IEC connector end.)  It becomes a parallel EGC.

If a closed ground fault circuit is provided current will travel in the EGC as well as the parallel connected shield. Current does not discriminate. It will take any path that is provided back to the source. In this case the Utility Power transformer.

If you DIY your own shielded power cords only connect the shield to the EGC at the male plug end. Leave the other end of the shield, at the IEC connector, floating.

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@mitch2 

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A good example where a shield is also used as a signal ground is a Coax Cable.