| 摘要 |
A double-insulated electrical isolation and distribution enclosure 10 comprises a lower housing 12 for terminating upstream and/or downstream large diameter power cables, such as those used in railway signalling. An upper housing 14 carries a bank of control switches 70 and fuse carriers 72 and is hinged to the lower housing 12 so that it closed over the lower housing. The upper housing has an access lid 16, and a retainer means to secure the upper housing closed on to the lower housing. The lower housing 12 has electrically insulating interior and exterior surfaces and an insulating partitioning element 24 forming two cable-terminating compartments 30, 32. Two insulating access covers 34, 36 close each of these 30, 32, respectively, and are themselves covered when the upper housing 14 is closed. This arrangement can be used to allow selective isolation of only some upstream and/or downstream large diameter power cables in a railway signalling system, so that some cables can be repaired or replaced while others are still live and maintain the double insulation.
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