*545 BOX, SWITCH 3X2X2-1/2 | Four cable knockouts (end). Two 1/2 in knockouts (end). With NMSC, non-metallic sheathed cable clamps. Old work clip. 3 in x 2 in x 2-1/2 in D, 12.5 cu-in. Acceptable for use in 2 hrs rated fire walls. UL listed.