A cable hanger includes: a base with a front wall having locking projections and a rear wall having an opening; a pair of arcuate front arms mounted to front locations on the base, the front arms extending laterally from opposite sides of the base and having first locking features; and a pair of arcuate rear arms mounted to rear locations on the base, the rear arms extending laterally from opposite sides of the base and having second locking features. The front and rear arms on one side of the base are mounted in back-to-back relationship, and the front and rear arms on the opposite side of the base are mounted such that they are in back-to-back relationship. The locking projections of the base are insertable into the opening. The first locking features of the front arms are interlockable with the second locking features of the rear arms.