Abstract: Masonry blocks are provided with at least one pre-formed or easily formed opening for an electrical box without requiring that an opening be cut with a saw or a chisel. One exemplary masonry block has at least one integrally molded opening for receiving an electrical box. Another exemplary masonry block has at least one integrally-molded knock-out that provides a selectably removable opening for receiving an electrical box. The knock-out may be formed of the same material from which the masonry block is molded, and may be, for example, formed with a thinned portion of a wall of the block or a plurality of cuts in a portion of a wall shaped the same as the electrical box opening.

Abstract: Masonry blocks are provided with at least one pre-formed or easily formed opening for an electrical box without requiring that an opening be cut with a saw or a chisel. One exemplary masonry block has at least one integrally molded opening for receiving an electrical box. Another exemplary masonry block has at least one integrally-molded knock-out that provides a selectably removable opening for receiving an electrical box. The knock-out may be formed of the same material from which the masonry block is molded, and may be, for example, formed with a thinned portion of a wall of the block or a plurality of cuts in a portion of a wall shaped the same as the electrical box opening.