from wikipedia:
""Examples
A microwave oven utilises a Faraday cage, which can be partly seen covering the transparent window, to contain the electromagnetic energy within the oven and to shield the exterior from radiation.
Elevators and other rooms with metallic conducting frames simulate a Faraday cage effect, leading to a loss of signal and "dead zones" for users of cellular phones, radios, and other electronic devices that require external electromagnetic signals. Small, physical Faraday cages are used by electronics engineers during testing to simulate such an environment to make sure that the device gracefully handles these conditions.
The shield of a screened cable, such as USB cables or the coaxial cable used for cable television, protects the internal conductors from external electrical noise and prevents the RF signals from leaking out.
A booster bag (shopping bag lined with aluminium foil) acts as a Faraday cage. It is often used by shoplifters to steal RFID-tagged items.[3]
Similar containers are used to resist RFID skimming.
A home-made Faraday cage at the University of Arizona in Dr. Michael Heien's Lab
Plastic bags that are impregnated with metal are used to enclose electronic toll collection devices during shipment to the customer, so that a toll charge is not registered if the delivery truck carrying the item passes through a toll booth.[citation needed]
Some electrical linemen wear Faraday suits, which allow them to work on live, high voltage power lines without risk of electrocution. The suit prevents electrical current from flowing through the body, and has no theoretical voltage limit. Linemen have successfully worked even the highest voltage (Kazakhstan's Ekibastuzâ"Kokshetau line 1150 kV) lines safely.[citation needed]
The scan room of a Magnetic Resonance Imaging (MRI) machine is designed as a Faraday cage. This prevents external RF (radio frequency) signals from being added to data collected from the patient, which would affect the resulting image. Radiographers are trained to identify the characteristic artifacts created on images should the Faraday cage be damaged.
Faraday cages are routinely used in analytical chemistry to reduce noise while making sensitive measurements.
A Faraday cage was used in 2013 by the Vatican to shield the Sistine Chapel from electronic eavesdropping during the secret papal conclave to elect the next pope.[4]
Automobile and airplane passenger compartments are essentially Faraday cages, protecting passengers from electric charges, such as lightning during a thunderstorm.
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Seems like it isn't a problem.