若做成II类,考虑其结构,根据IEC 60598:2008 clause 4.10.1For metal encased class II luminaires, contact between:
– mounting surfaces and parts with basic insulation only,
– accessible metal parts and basic insulation, shall be effectively prevented.
目前疑惑是,金属支架管内含有相当长的内部接线,还是依据IEC 60598:2008 clause 4.10.1来考虑,NOTE 1 This requirement does not exclude the use of bare conductors if adequate protection is provided. This wiring includes internal and external wiring of the luminaire, and fixed wiring of the installation.
再参考GB 7000.1国家标准贯宣教材对此条款的解释,应当防止基本绝缘部件和可接触金属部件之间的接触,包括灯具的外部和内部接线以及设施的固定布线。以上要求并不排除使用有足够防护的裸导体。