First, the lighting voltage 1, the general light source power supply voltage should be 220V. The power supply voltage of high-intensity gas discharge lamps of 1500W and above should be 380V.
(1) Mobile and portable luminaires shall be Class III luminaires, which shall be powered by a safe extra-low voltage. The voltage values ​​shall comply with the following requirements:
(1) not more than 50V in a dry place;
(2) Not more than 25V in wet places.
2. The terminal voltage of the lighting fixture should not be greater than 105% of its rated voltage, nor should it be lower than the following values ​​of its rated voltage:
(1) General workplace - 95%;
(2) 90% of the small area away from the substation; when the general workplace is difficult to meet the requirements of paragraph 1;
(3) Emergency lighting and lighting with safe extra low voltage supply - 90%.
Second, the lighting distribution system 1, the distribution transformer for lighting settings should meet the following requirements:
(1) When there is no high-power impact load on the power equipment, the lighting and power should share the transformer;
(2) When the power equipment has a high-power impact load, the lighting should be connected to the impact load from different transformers; if the conditions are not allowed, when the same transformer is to be connected, the lighting should be powered by the dedicated feeder;
(3) When the lighting installation power is large, it is advisable to use a special transformer for lighting.
2. The power supply for emergency lighting shall be in one of the following ways according to the type of emergency lighting, the requirements for use of the site and the power supply conditions of the building:
(1) A line connected from the power grid that is effectively independent of the normal lighting source;
(2) Battery packs, including self-contained batteries in the lamps, centralized installation or centralized storage of battery devices;
(3) Emergency generator sets;
(4) A combination of any two of the above.
3, evacuation lighting exit sign lights and pointing signs lights should use battery power. The power supply for safety lighting should be connected to different transformers or different feeder mains from the power lines of the site. The alternate lighting power source should use the first or third method listed in 7.2.2 of this chapter.
4, lighting distribution should use a combination of radial and trunk systems.
5, the phase load of the three-phase distribution trunk should be balanced, the maximum phase load should not exceed 115% of the average value of the three-phase load, and the minimum phase load should not be less than 85% of the average value of the three-phase load.
6. The lighting distribution box should be placed close to the lighting load center for easy operation and maintenance.
7. The current of each lighting single-phase branch circuit should not exceed 16A, and the number of connected light sources should not exceed 25; when connecting building combination lamps, the loop current should not exceed 25A, and the number of light sources should not exceed 60; connecting high-intensity gas discharge lamps The current of the single-phase branch circuit should not exceed 30A.
8. The socket should not be connected to the same branch circuit as the lighting.
9. In places with large voltage deviations, when there are conditions, an automatic voltage regulator should be installed.
10. The distribution line supplying the gas discharge lamp should be provided with capacitance compensation in the line or the lamp, and the power factor should not be lower than 0.9.
11. In places where the stroboscopic effect of a gas discharge lamp has an impact on visual operations, one of the following measures should be used:
(1) using high frequency electronic ballasts;
(2) Adjacent lamps are tapped in different phase sequences.
12. When Class I lamps are used, the exposed conductive parts of the lamps shall be reliably grounded.
13. Safety extra low voltage power supply should adopt safety isolation transformer, and the secondary side should not be used for protection grounding.
14. The residential building should be equipped with an electric energy meter according to the household; if the factory has conditions, it should set the electric energy meter according to the workshop; the office building should set the electric energy meter according to the tenant or unit.
15. The grounding method of the distribution system and the protection of the distribution line shall comply with the relevant provisions of the relevant national standards.
Third, the choice of conductor
1. For lighting distribution trunk lines and branch lines, copper core insulated wires or cables shall be used, and the branch line section shall not be less than 1.5mm2.
2. The lighting distribution line shall calculate the cross-sectional area of ​​the conductor according to the load calculation current and the allowable voltage value of the lamp end.
3. The three-phase distribution line mainly supplying gas discharge lamps, the cross section of the neutral line should meet the requirements of unbalanced current and harmonic current, and should not be smaller than the phase line cross section.
4. The selection of the grounding wire section should comply with the relevant provisions of the current national standards.
Fourth, lighting control
1. Group control measures.
2. Public places such as stadiums, theaters, waiting rooms, waiting rooms should be centrally controlled, and control measures such as dimming or reducing illumination should be taken as needed.
3. Each room (set) of the hotel should be equipped with an energy-saving control type main switch.
4. Residential buildings have natural lighting for stairwells and walkway lighting. In addition to emergency lighting, energy-saving self-extinguishing switches should be used.
5. The number of light sources controlled by each lighting switch should not be too much. The number of switches in each room light should not be less than 2 (except for only one light source).
6. When two or more columns of lamps are installed in a room or a place, they should be grouped and controlled as follows:
(1) The row of controlled lights is parallel to the side windows;
(2) Production sites are grouped by workshop, section or process;
(3) Electrified classrooms, conference halls, multi-purpose halls, lecture halls, etc., grouped close to or away from the podium.
7. For the qualified places, the following control methods should be adopted:
(1) Where the natural lighting is good, the lights or dimming are automatically switched according to the illumination of the place;
(2) The office used by the individual automatically switches the light by means of human body induction or motion and static induction;
(3) The hotel's foyer, elevator lobby and guest room corridors, etc., adopt automatic dimming device that reduces illumination at night;
(4) Large and medium-sized buildings, using centralized or distributed, multi-function or single-function automatic control systems according to specific conditions.
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