Wieland BST14i2 T-Connectors Wieland BST14i2 T-connectors are for use with the BST14i2 cable and panel mount connector system, mechanically and colour coded for ease of assembly and to prevent misconnections with a built in locking device to retain the attached connectors. Green coded BST14i2-connectors are suitable for KNX installations, while blue coded BST14i2 connectors are suitable for dimming signals. Rated at 50V, 3A