Personal Defense Project Electrical Code:
Abstract:
Because of the special nature of the building of the human defense, the design of the human defense electrical and ordinary civil building electrical has a big difference. In this paper, the human defense electrical design of the human defense power supply selection, human defense power distribution system, peace and war and human defense electrical design is easy to make a mistake and ignore the place to do a summary and generalization.
Keywords:
Personal Defense Electricity; Human Defense Power Supply; Human Defense Load; Human Defense Distribution
In the electrical design of human defense basement project, first of all, it is necessary to clarify the type of wartime load and load level, and to select the human defense power supply. As a civil defense project, it is also necessary to clarify the type and load level of the usual load, and then select the power supply according to the importance of the usual load and the wartime load. Under the premise of meeting the usual load and wartime load requirements, the wartime design should try to utilize the usual part, that is, to fully achieve peace and war together, in order to help reduce the cost of the project, but also to make the usual and wartime power distribution system is relatively independent, reliable operation. Due to the special nature of the civil defense building, compared with the electrical design of ordinary civil buildings have many different, especially the line laying method, laying path. The following aspects of these aspects are described.
1 to determine the usual, wartime load level, human defense power and human defense power distribution system: in the design of the first to determine the usual and wartime load and load level. For the usual load level determination will not be repeated here. For wartime load level determination can check the "people's air defense basement design code" GB 50038-2005 table 7.2.4. The following common second-class personnel shelter underground garage load and load level list a list of the following:
According to the requirements of the relevant norms, wartime first-class load, there should be two independent power supply, one of which should be an independent power supply the air defense basement internal power supply; wartime second-class load, there should be two independent power supply, one of which should be an air defense basement internal power supply; wartime second-class load, there should be two independent power supply. The wartime secondary load should be connected to the regional power supply, and when there is difficulty in connecting to the regional power supply, a self-supplied power supply should be set up in the air defense basement; the wartime tertiary load should be connected to the power supply of the electric power system. The central hospital, emergency hospital and the sum of the building area of more than 5000m2 of other human defense projects should be set up inside the diesel power station. In addition to the central hospital, emergency hospitals and the sum of the building area less than 5000m2 of the primary load of the civil defense project for basic communications equipment, emergency communications equipment, emergency lighting. These primary load capacity is relatively small, can use EPS and other battery power as internal power supply, usually design in place, reserved wiring and installation location, wartime installation. Under normal circumstances, civil defense projects are planned for wartime regional power supply, that is, wartime power requirements of the secondary load can basically be met. If it is not possible to lead to the regional power supply, wartime primary and secondary loads should be set up EPS and other battery power. The choice of human defense power supply can refer to Table II for selection. 2 civil defense design of war:
Personal defense basement engineering can be divided into power and lighting equipment for civil war. For power equipment first to determine the load level of the war, and then according to the load level for power distribution. For the lighting system is a little more complicated, in order to make the lighting system can be fully used in peace and war, the lighting box should be set up according to the division of human defense unit to set up. Because the maximum area of a fire zone is larger than the area of the human defense unit, a larger fire zone is often divided into two to three human defense unit, and each human defense unit needs to be set up a wartime lighting box; so to achieve the lighting box of peace and war, the lighting box can no longer be set up according to the usual way of division of fire zones. According to "Building Lighting Design Standards" GB 50034-2004 garage illumination standard value of 75LX. According to "People's Air Defense Basement Design Code" GB 50038-2005 in addition to wartime medical ambulance project illumination requirements than the usual garage illumination requirements, the rest of the people's air defense project illumination requirements were 100LX, 75LX, 50LX, and the usual garage illumination requirements are very close. Illumination requirements are very close to the usual garage. In peace and war conversion, only a small increase or decrease in the usual lamps and lanterns to meet the wartime illumination requirements. 3 human defense design needs special attention:
Since the special nature of the human defense project on the confinement and explosion-proof requirements, the design needs to minimize the number of pipelines through the human defense enclosure structure. As the power distribution of human defense equipment are distributed by the respective human defense distribution box in the human defense area, crossing the human defense enclosure is less. The usual power distribution is often based on radial power distribution, more outgoing circuits, there are cases of crossing the human defense unit and the human defense enclosure. Therefore, the location of the usual power distribution room that is to consider the convenience of the power supply into the line and close to the load center, but also to reduce or avoid the line through the case of human security enclosure. For the lighting box set up in the human defense zone to the non-personal defense zone lighting power distribution, the number of lighting circuits to the non-personal defense zone power distribution should not be too many. If there are more lighting circuits in the non-personnel defense area, lighting distribution box should be set up in the non-personnel defense area, avoiding the lighting box from the adjacent human defense unit, in order to reduce the number of pipelines crossing the human defense enclosure for airtight treatment.
Because of the non-human defense area and the human defense area of the security and reliability of the guarantee is different, non-human defense area of the line is more likely to be damaged, the electrical line should be prevented from the human defense area out of the line to the non-human defense area and then back to the human defense area of the situation. Lighting fixtures and automatic fire alarm system wiring are large and extensive, in the design of special attention.
Taking into account the effect of airtight, in and out of the air-raid basement electrical wiring, power circuits should be selected with cable, the mouth of the lighting circuit selection of sheathed wire. As the usual design of the power circuit is basically the use of cable, so the power circuit can basically meet the requirements. The lighting circuit usually use BV wire, this time in and out of the air-raid basement section should be changed to BVV and other sheathed wire.
When using the bridge for laying across the airside wall, protection of airtight partition walls, airtight partition walls should be changed to pipe laying, and airtight processing. In order to ensure that the wall is crossing the protection, confinement performance, in the confinement treatment must be a cable through a confined tube. If the number of cables laid in the bridge is large, the confined tube will take up a large cross-section in the confinement process. In order to ensure that the cable can still be protected by the bridge after crossing the closed tube, the bridge should be increased in the cross-section of the disconnection. As the bridge breaks the use of closed pipe for the confinement process will increase the cross-section through the wall, the bridge laying path needs to be reasonably selected. It is not appropriate to choose the structural beam for confinement, but should be in the concrete wall for confinement treatment.
According to the relevant norms of human defense design, the metal components of the building structure, such as protection of airtight doors, explosion-proof wave of metal door frames and fire shutter metal door frames, components, etc. should be done to equipotential bonding. For the metal door frame of the grounding specification provisions are clearly mentioned, so the design can basically take into account in place. And the conversion of the war between the war between the war unit war blocking and entrance and exit war blocking also buried metal components, because the provisions of the code did not directly mentioned in the equipotential design will be missed and not equipotential linkage processing.
In order to meet the needs of human defense evacuation, the main entrances and exits to protect the closed door outside the channel lighting should be designed to the ground, and its power supply should be human defense power. Especially attached to the underground garage of the human defense project, when the use of the usual stairwell for the main entrance and exit, from the mouth of the lighting to the staircase ± 0 level of lighting power supply should come from the human defense power distribution box. Due to the usual lighting design of the evacuation path is divided according to the building fire division, and wartime is divided according to the protection unit, the emergency evacuation channel path will appear inconsistent situation. At this time, the design of emergency evacuation lighting should take the usual and wartime design, the conversion period in the war will be inconsistent with the war according to the wartime design of the conversion process.