【 Weak current College 】 fire emergency lighting system of the design issues---Power By 【 China power house network 】

Fire emergency lighting is generally have three major functional systems: fire emergency lighting fire work composed of functional systems, lighting for fire fighting and rescue personnel Setup, General settings in the power generation and distribution House, fire pumps, fire protection control center, communications center, and other important places, their response time should not be lower than 90min and meet functional illumination requirement; from fire emergency evacuation lighting fire evacuation consisting of functional systems for the evacuation is providing the necessary illumination and settings, General settings on the public sidewalk and vertical stairs, their response time is less than 90min, illumination of not less than 0.5Lx; from low bit fire emergency evacuation lighting and evacuation instructions and other marks forms (such as photoluminescence-sign) emergency evacuation system, in order to identify the function of evacuation provides clear guidance direction and approach, generally installed in the shopping centre, cinemas and other personnel-intensive large public areas of the public sidewalk and vertical stairs, typically located on the ground or from the ground below the lm response time is less than 90min, sign the master standard interface surface brightness is not lower than 15cd/m2.
Check in daily fire supervision in the fire emergency lighting system in the following issue attention: 1 emergency lighting is not used for the power supply circuit, which is the nearest lap in non-fire dedicated lighting circuit
(1) the civil construction electrical design code 11.8.9 stipulates: "evacuation lighting with battery for emergency lighting, the normal power supply can be received from this layer (or district) of power strips, dedicated circuits or quotations from this layer (or district) of disaster prevention dedicated power strips. That is, that the dispersal of lighting with battery for emergency lighting, the normal power supply should be received from this layer (or district) of disaster prevention dedicated power strips, conditions did not have the time to reduce requirements received since this layer (or district) of total power strips, but should have a dedicated circuit, that is, its power supply circuit and the sharing of non-fire power. If the emergency light with battery and indiscriminate jieyin at this layer (or district) in normal lighting power supply, fire cut off power in non-fire power, emergency lighting without reliable electricity supply and play a role. As Dongba Guangyuan pooled supermarket stores nearly 30 lamp with power fire emergency lighting all nearby received in normal lighting lines, without business State to cut off power to the non-fire, emergency lighting battery starts to work, stop working after the normal charging, in the event of fire, emergency lighting is unable to perform its functions; in addition, if the emergency lighting battery charge and discharge every day, to a greater loss of battery, accelerated emergency light battery scrap.
(2) distribution room, fire pumps, fire elevator machine room, fire and smoke in the engine room control room, own generator room, telephone, total room fires still need good workplace fire emergency lighting, subject can be cited from the floor (or regional) fire emergency power strips; can also be places of lighting and lighting, jieyin since fire power electricity two separate a preparation with a dual power supply (or loop) power supply automatic cutting discs; or without dual-supply automatic switching, lighting and lighting, jieyin since respectively with a standby circuit. Alternate lighting should be able to guarantee the normal lighting, emergency lighting battery general use as a backup power supply, as the transition of power conversion.
(3) in order to avoid fire emergency lighting in the design phase of confusion, it is recommended that the fire emergency lighting and lighting design separately, so that both easy to read graphs, construction and design review, it is easy to correct errors, and ensure project quality. 2 partial exaggerated by emitting label plates, regardless of location and selection of such products
Light-emitting label plates is a rare-earth material light-storing signs. The current technical standards, the sunlight or fluorescent light source irradiation 10h class above, the surface brightness up to a maximum of 3 ~ 5cd/m2 brightness, but it only lasts a few minutes to decay to-candela-level and lasts several hours. In the surrounding environment is very dark (generally not exceeding 1Lx), you can also display its logo, but not "active" to attract the attention of the eye. Such signs must set the corresponding light source, to guarantee in the event of a fire within accepted before the light source irradiation to savings of more light energy.
According to the national fire laboratory test reports provided by: photoluminescence-signs because of their low surface brightness, in place of the illuminance is greater than 1Lx is not attractive vision; have a smoke, only a short distance is only vaguely discernible. Who will play his belly to indicate the effect, but you must make consecutive sets of such signs, otherwise once the breakpoint will be wasted.
In the event of interruption of the normal lighting after fire, you must ensure that evacuation lighting synchronization starts and ensure the General premises illumination of not less than 0.5Lx, personnel are crowded places and vertical stairs inside should not be lower than 1Lx, to ensure that personnel security quickly escape. In providing evacuation of illumination, and the need for clear identification guide rapid move towards export personnel, regardless of smoking or non-smoking, these flags must be rapidly induce Visual attention, therefore, the emergency lights must be fire emergency lights to play, not only used photoluminescence of signs. In addition, photoluminescence-sign only fire late (after evacuation lighting 90min lamp off), creeping forward escape to have positive effects, only works for fire emergency lights of secondary use flags. 3 emergency lighting settings do not meet the requirements
(1) civil emergency lighting instead of fire emergency lighting in the large-scale use of civilian emergency lighting in places not set fire emergency lighting; civil emergency lamp 4 comes with the power of the continuous work of emergency lighting, illumination that is around 20min slowly decreases to zero; the charging and discharging frequently, if normal maintenance, poor maintenance or faulty power supply line, easily damaged .5 emergency lighting selection does not comply with the building of the actual characteristics of the
In the fire safety inspection found that the vast majority of buildings with power independent control of fire emergency lighting, personnel are crowded, evacuation distance, evacuation channel more, turning many, environmental complex large-scale construction not only costs, but also check maintenance inconvenient, not centrally managed. 6 use 220V above power as emergency lighting power supply
With 220V power supply urban power network and generator power as an emergency power supply, and General fire fighting power distribution, fire emergency lighting set parts, pipelines and horizontal arrangement, but most of the layout in the ceiling, fire, suspended ceiling, it is easy to burn, and easily broken pipeline rupture, lamps. If you spray system, large amounts of water into the floor, 220V power supply may be later evacuation and fire-fighters constitute a threat to life and may cause fire due to a fire emergency lighting circuit and spread. 7 line laying out-of-compliance requirements
Buildings》 etc main norms on fire emergency lighting distribution lines of protection had to the specific requirements of the "fire electricity equipment distribution lines should wear pipe protection", "emergency lighting and evacuation signage should use glass or other non-burning material of the protective shield". Fire emergency lamp arrangement of faceted, and most of the settings in the ceiling above, if a fire condition pipeline rupture, lamps broken, it is easy to result electrical circuit, leakage or produce greater fault currents. Centralized supply of emergency lighting on line requirements are higher, because this type of emergency lighting power supply from power strips, jieyin trunk route of a damaged or lamp short circuit, causing the entire root line emergency lighting all damaged. Therefore, we should strictly comply with the law, the doctrine of jiangui, illustration for fire emergency lighting, enhancing fire emergency lighting and power distribution lines of protection; strict purchase, use of standards products and flame-resistant copper cable; do a distribution line of fire protection. Concealed when laying in the non-burning body structure, thickness not less than 3cm. Downlead wear metal tubes, lamps of hoses, junction box and wiring is header should take fire protection measures; fire emergency lighting distribution equipment should be clearly marked, its distribution lines and control circuit should be fire compartmentation, distribution lines when the downlead should wear a metal pipe or trunkings coated fireproof paint protection. In engineering fire inspection and acceptance found: fire emergency lighting line uses the downlead without any fire prevention measures, even if a provision of fire protection measures for the introduction of lamps of hose, junction box and wiring is header do not effectively protected, even bare in external; not strictly follow the instructions for use of luminaires and control wiring, or even fire emergency lighting direct socket and switch on conventional lighting line. 8 failure to strictly enforce the new fire emergency lighting (GB17945-2000) standard, the standard from 1 October 2002 officially, but implementation is not satisfactory
The Ministry of clear requirements: as the industry standard products to the 2001 uniform for scrap processing, around the fire agencies should strictly control the design of the building fire safety audit, inspection, prevention is not in line with national standards for emergency lighting-live streaming people market. But part of the fire emergency lighting manufacturers will continue as the industry standard for the production of the product, the replacement of the packaging and the instructions and then put into the market. 9 design and construction units failed to give full attention to fire emergency lighting system in building fire facilities status and role in the
In engineering design and construction process, not on fire emergency lighting for overall planning and overall consideration; or edge design edge construction until the end of the project to the acceptance stage, even before proceed to rectification of additional emergency lighting. But emergency lighting of power supply, control, product model has no choice, congenital problems.