60335灼热丝测试问题请教

30.2.2 中描述parts of insulating material within a distance of 3 mm of such connections, are subjected to the glow-wire test,
后面有描述This test is not applicable to--parts within 3 mm of any of these connections;
特请教列位高手,两种描述有啥差别,或是本人才疏学浅,理解错误??先行谢过!