230、上层建筑某舱室的围壁，按照SOLAS 要求必须是A－60 防火级别，但是围壁上有一根照明电缆，它的的支架与围壁钢板的之间的间隙太小，无法敷设规定厚度的A－60 绝缘材料。请问下列哪一种解决方法是正确的？
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