I Type Joint Box: It is specially designed for protecting I type busbar joint, with convenient operation and solid connection.Have three kinds of voltage grades: 1KV, 10KV. 35KV.Have two kinds of layer: single layer, double layers.Color: Red, yellow, green, black T Type Joint Box: It is specially designed for protecting T type busbar joint, with convenient operation and solid connection.Have three kinds of voltage grades: 1KV, 10KV. 35KV.Have two kinds of layer: single layer, double layers.Color: Red, yellow, green, black L Type Joint Box: It is specially designed for protecting L type busbar joint, with convenient operation and solid connection.Have three kinds of voltage grades: 1KV, 10KV. 35KV.Have two kinds of layer: single layer, double layers.Color: Red, yellow, green, black