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发表于 2018-7-9 09:20:06
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本帖最后由 BXHH 于 2018-7-9 09:35 编辑
发帖无意挑起争议,或者否定规范成果,只是有感于现行规范体系的不完善。我国的规范体系本来历来有拿来主义+拍脑袋的传统,特别是在工程系列内。随着这波规范梳理,希望能形成理论较为严谨、结论经得起验证的规范体系,在执行、意见收集、修订等方面能吸纳更多意见,能不断的良性发展。
个人理解,对集中供电和灯具自带电池两种情况,其配线和控制要求,应该区别对待,就如BS5266-1:
8.1 Wiring for self-contained systems
Self-contained emergency luminaires do not require fire-protected cable
supplies. They should be installed to the same standard as normal luminaires,
and both should be part of the periodic inspection and testing of the electrical
installation at intervals appropriate to the type of building in question.
8.2 Wiring for central power supply systems
8.2.1 Quality of installation
Cables or cable systems used for the connection of an emergency lighting
luminaire to the central power supply should adequately resist the effects of fire
and mechanical damage and retain circuit integrity. This should be achieved
through the use of cables or cable systems with an inherently high resistance to
the effects of fire, and either with inherently high resistance to mechanical
damage, or with additional mechanical protection in any areas in which physical
damage or rodent attack is likely.
Cables or cable systems should be routed through areas of low fire risk wherever
practicable.
If the emergency supply cable is looped in and out of a luminaire, the integrity
of supply to other luminaires should be protected. Porcelain terminal blocks
should be used for the emergency cable, and a circuit protective device should
be installed in the supply to each luminaire to safeguard the emergency supply.
这里将两种情况区分得非常清楚,对灯具自带电池的情况,要求等同于普通照明即可,其实最好理解,普通照明失效,应急照明自动点亮,如果加一堆措施,反倒不能自动点亮或者降低了这种天然的可靠性,意义何在?
而对集中供电的应急照明,其要求比我们现行的规范要求更高更具体,不仅要耐火和机械防护来保证线路完整性,并且尽量敷设在火灾风险较低的场所,甚至要保证每个灯具的可靠性,要求每个灯具都需要自带保护设备,不能因为一个灯具出现短路等,造成整条线路的应急照明失效。
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