When built to code, cable railing is a very safe option for railing. There are specific requirements for each aspect of the railing system, such as handrail height, the amount of pressure that the system must be able to withstand, and how far apart the posts must be spaced. In general, cable railing code requirements come from two different sources: The IRC (International Residential Code), and local, city, or state codes (for example: the California’s Guardrail Code)