"Life is precious!" In the market, a wide range of products are brightened by our eyes today, how to correctly purchase high-quality, guaranteed, and cost-effective fire emergency products, and truly implement fire emergency prevention measures into practice. It has caused headaches for countless fire product suppliers, buyers, project purchasers, and many units and individuals who use home fire emergency lights.
There are many types of emergency lights, including portable emergency lights, fire emergency lights, energy-saving emergency lights, emergency lights, underwater emergency lights, rechargeable emergency lights, solar emergency lights, and multi-function emergency lights. Depending on the venue and frequency of use, adjustments should also be made when purchasing emergency lights. The first thing to note is the reasonable choice of the power supply control method of the emergency lighting system. There are two kinds of emergency lighting systems, one is the self-contained power supply independent control type, and the other is the centralized power supply centralized control type.
The emergency lighting system currently used in China is mainly controlled by its own power supply. In the ordinary lighting power supply circuit, when the normal power supply is cut off, the emergency light that has been charged by the battery in the normal time will be automatically supplied to the light source to play the emergency lighting function. Various types of emergency lights Each lamp has a large number of electronic components such as transformer, voltage regulator, charging, inverter, battery, etc. The battery needs to be charged and discharged during use, maintenance and failure.
The other is centralized power supply centralized control type. There is no independent power supply in the emergency light. When the normal lighting power supply fails, the centralized power supply system supplies power. In this form of emergency lighting system, the complicated electronic circuits inside all the lamps are omitted, but only one fire line is added in the wiring device. When the normal lighting power system fails, the emergency system automatically connects the fire line to realize Four-line strong lighting function. This kind of emergency lighting fixture is no different from ordinary lighting fixtures, and the centralized power supply system is set in a dedicated room.
Compared with the self-contained power supply independent control type emergency luminaire, the centralized power supply centralized control emergency luminaire is convenient for centralized management, user self-examination, fire supervision and inspection, extending lamp life, improving emergency evacuation efficiency, system reliability, long service life and maintenance. Easy to manage and low system price. However, centralized power supply centralized control type emergency luminaires have no backup power supply (battery) in each emergency luminaire. When the power supply line fails, it will directly affect the normal operation of the emergency lighting system, so special fire protection requirements are applied to the power supply line. . The self-contained power supply independent control type emergency luminaire has no backup power supply (battery) in each emergency luminaire, so there is no special requirement for the power supply line, and the power supply line failure does not affect the standby power supply. When the emergency light fails, it generally affects only the light itself, and has little effect on the whole system.
When selecting emergency lighting, the emergency lighting system should be selected according to the specific circumstances. Generally speaking, new construction projects or projects with fire control room should be unified in the construction process as much as possible, and centralized power supply centralized control type emergency lighting should be selected; for small sites, later rectification or secondary decoration renovation projects should be selected Power supply independent control type emergency lighting.
According to the new national standard GB17945-2010, the emergency conversion time of fire emergency lighting fixtures shall not exceed 5s, and the emergency conversion time of systems used in high-risk areas shall not exceed 0.2s; the emergency working time of the system shall not be less than 90min, and not less than lamps Its own nominal emergency working hours. The new national standard GB17945-2010 also has the requirements for the protection level of each component of the fire emergency luminaire system. It is stipulated that the protection level of the fire emergency luminaire should not be lower than the IP30 requirement specified in GB4208-2008, and should comply with it. Nominal protection level requirements; fire emergency luminaires (buried lights/buried lights) installed on indoor floors, the enclosure protection level shall not be lower than IP67 in GB4208-2008, and shall comply with its nominal protection grade.
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