The present disclosure is directed cable connectors (14), electrical modules (12) and assemblies thereof. The cable connectors can provide a sealed connection having a rating of IP 66/67 between electrical modules such as lighting fixtures and an insulated cable (16). Cable connectors can be quickly and easily engaged and disengaged with electrical modules to create customizable electrical assemblies. The cable connector can have an upper portion (22) having piercing pins (26) for penetrating the cable at one end and contacting terminals (76) of the module at another end, and a lower portion for clamping against the cable and locking to the upper portion. A gel mat (44A) can be provided in an area surrounding the piercing pins for sealing the area from water and dust. The module can include a skirt for engaging with an elastomeric sleeve on the upper portion to create a seal when the module is mated with the cable connector.