对于单相的直埋敷设，不能用铁磁材料作保护盒，建议用玻璃钢或硬质塑料保护盒。 与传统的电缆附件施工工艺不同，预制式电缆附件施工工艺复杂，工技术难度较大，它的安装程序和工艺要求不容易被施工人员熟练握，施工中普遍存在这样或那样的问题，是影响电缆分支箱正确安装与安全运行的主要因素。
For single-phase direct buried laying, ferromagnetic materials cannot be used as protective boxes, and FRP or hard plastic protective boxes are recommended. Different from the traditional construction process of cable accessories, the construction process of prefabricated cable accessories is complex and difficult in engineering and technology. Its installation procedures and process requirements are not easy to be mastered by the construction personnel. One or another problems generally exist in the construction, which are the main factors affecting the correct installation and safe operation of cable branch boxes.
电缆在安装的时候需要通过各种技术手段来确定电缆附件长度，对复检长短合适、平齐，防止因过长或过短相电缆产生较大的推力或拉力，导致固定的T型电缆接头与电缆或电缆分接箱出线套管接触不良，避免电缆分接箱出线套管因受力导致漏气。
During cable installation, the length of cable accessories shall be determined through various technical means, and the recheck length shall be appropriate and flush to prevent large thrust or tension caused by too long or too short phase cables, resulting in poor contact between the fixed T-shaped cable joint and the cable or the outlet sleeve of the cable junction box, so as to avoid air leakage caused by stress on the outlet sleeve of the cable junction box.
电缆分接箱基础内必须安装电缆固定支架，电缆三心分相处以下在支架上进行固定处理，同时应采取措施保证三叉头在接线柱的正下方，确保不发生分接箱内电缆及附件受到下拉力，这样可以有效避免电缆分接箱出线套管因受力导致漏气现象的发生。
The cable fixing bracket must be installed in the foundation of the cable distribution box, and the cable with three centers shall be fixed on the bracket. At the same time, measures shall be taken to ensure that the Trident head is directly below the terminal to ensure that the cable and accessories in the distribution box are not subject to downward tension, so as to effectively avoid air leakage caused by stress on the outlet sleeve of the cable distribution box.