Why do you have insulted end sleeves of two types: for one and for two cables, but there is only one type of non-insulated sleeves- for one cable?


The main reason is in the cuff. Insulated end sleeves have a cuff that due to its form does not let to put inside more cables than it was designed for. Non-insulated end sleeves do not have any cuff, so there is no obstacle for putting 2 or more cables if the cross-section size lets you do it.