A cable management system includes a cable-retaining spacer block defining a plurality of cylindrical passages arranged to define a rectangular array. Each cylindrical passage is configured to receive a transmission cable. Brackets are configured to support ends of the cable-retaining spacer block and enable suspension from a support cable. Another cable management system includes a center base, first and second intermediate wings configured to operably couple to the center base to define a first plurality of cylindrical passages configured to retain transmission cables therein, and first and second outer wings configured to operably couple to the first and second intermediate wings to define a second plurality of cylindrical passages configured to retain transmission cables therein. These cable management systems enable snap-together engagement without the use of tools, thus facilitating assembly.