Methods include:

1. Faraday cages: A faraday cage is an enclosure made of conductive material that blocks external electric fields. It works by conducting the electric charge around the outside of the cage, leaving the inside of the cage electrically neutral.

2. Shielded cables: Shielded cables have a conductive layer around the wires that carries the electrical signal. This layer helps to block external electromagnetic interference (EMI) from interfering with the signal.

3. Conductive coatings: Conductive coatings, such as metallic paints or coatings, can be applied to the surface if a device to shield it from EMI.

Why they may not be fully used on an electrical device:

1. Cost: Shielding can add significant cost to the manufacturing process, which can make the device expensive.

2. Size and weight: Shielding can add size and weight to the device, which may not be desirable in certain applications.

3. Interference: Shielding can interfere with other signals that are desired, so it must be designed carefully to avoid this issue.

4. Accessibility: it may be difficult or impossible to fully shield a device due to the need for external accessibility or other design restraints.
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