indicating wall locations with tape

so in my house (built 1955), a wall in the living room does not have a grounded outlet and i need one there so i want to run an extension cord/plug up from the basement. in the basement, above the drop ceilings, there is a long piece of masking tape (ancient and unmarked) that runs right about where i have roughly measured the wall on the floor above it to be.
is it customary to mark the location of a wall of the floor above with tape?
thanks everyone.
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No.

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snipped-for-privacy@gmail.com wrote:

Why do you want to go through this for the benefit of having a ground?
in the basement, above the drop

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Running extension cords through walls and floors is a no-no, for good reason. If it starts a fire, your insurance company will likely decline to cover the damage. If you need a new or upgraded outlet on that wall, install one, or pay a an electrician to do it properly if you don't know how. Sound like good access from basement, so it shouldn't be a big deal.
aem sends....
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snipped-for-privacy@gmail.com wrote:

It may appear unmarked, but if you illuminate the tape with a UV light you'll be able to read the original message. It most likely reads, "No nails - waste pipe directly above."

No problem.
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