three black power wires are attached in parallel to an aerated concrete brick. electrical wiring in the wall of the gas block

aerated are attached bare black block brick cable chloride close-up concrete conductor connection construction deenergization disconnection electric electrical electrician fastening gas grounding house industry insulation mortgages parallel polyvinyl power private repair resistance section sheath sockets stationary switch thickness three threecore voltage wall walls winding wire wires wiring without