A: Light is an electromagnetic radiation phenomenon in a certain wavelength range.
2. What is visible light?
A: Electromagnetic radiation that can directly cause vision.
3. What is the wavelength range of visible light?
A: The wavelength range of visible light is 380nm to 780nm.
4. What is the nature of electromagnetic radiation slightly less than 380 nm? What is the nature of electromagnetic radiation slightly larger than 780nm?
A: Electromagnetic radiation slightly less than 380 nm is ultraviolet light, and slightly larger than 780 nm electromagnetic radiation is infrared.
5. What is the most sensitive electromagnetic wavelength of the human eye?
A: The most sensitive electromagnetic wavelength of the human eye is 555nm.
6. What is the change in light color when the electromagnetic wave changes from 780 nm to 380 nm?
A: When the electromagnetic wave changes from 780nm to 380nm, the light color changes sequentially by red orange, yellow, green, blue and purple.
7. What are the types of light radiation?
A: There are three types of light radiation: ultraviolet light, visible light and infrared light.
8. What is glare?
A: Light in the field of vision of the human eye causes visual discomfort or a phenomenon of decreased vision, called glare.
9. What are the types of glare in road lighting?
A: There are two types of glare in road lighting: glare and uncomfortable glare.
10. What is a light source?
A: In lighting engineering, objects that radiate themselves and produce light in the human eye are collectively referred to as light sources (or illuminants).
11. What is a point source?
A: A light source of sufficiently small size that it is smaller than the distance it can accept until it is negligible in the calculation.
12. What is the radiation energy?
A: Energy emitted, transmitted or received in the form of radiation. Symbol: Q, Qe unit: Joule (J).
13. What is the radiation (radiation) power and the radiation (radiation) flux?
A: The power transmitted, transmitted or received in the form of radiation. Symbol: P(ΦeΦ), unit: watt [special] (W).
14. What is the intensity of radiation?
Answer: The ratio of the radiant flux emitted by a point source (or radiating surface element) in a solid angle element containing a given direction to the solid angle element. Symbol: I, IeIe = dΦe / dΩ, unit: watt [special] / sphericity (W / Sr).
15. What is spectral light efficiency?
Answer: The ratio of the radiant flux of the two radiations of the wavelengths λm and λ, which are equal in perceived light intensity, under a particular luminosity condition, λm is chosen to be at a maximum ratio of one.
Symbol: V(λ) for bright vision and Vˊ(λ) for dark vision.
16. What is luminous flux?
A: The amount derived from the product of the flux flux Φe(λ) and the standard spectral luminous efficiency V(λ). In bright vision, the light energy can be expressed by the following formula: Φ = Km ∫ Φe (λ) oV (λ) d λ
Where: Φe(λ)- corresponds to the radiant flux contained between λ and +dλ;
V(λ)-CIE spectral luminous efficiency, its value is a function of λ;
The maximum value of the Km-spectral optical performance curve K(λ), according to international agreement, at a wavelength of 555 nm, Km is 683 Im/W".
Symbol: Φ, Φv unit: lumens (lm)
17. What is the (light) light intensity (the light source is in a given direction)?
Answer: The ratio of the luminous flux emitted by the light source to the solid angle element in the solid angle element in a given direction. Symbol: Iv, I, Iv=dΦe/dΩ, unit: åŽ[德拉]/(cd)
18, what is (light) brightness?
A: The ratio of the luminous intensity of a bin in a given direction to the orthographic area of ​​the bin on a plane perpendicular to a given direction.
Symbol: L (Lv), unit: kan [Dera] / square meter (cd / m2)
19. What is the (light) performance (light source)?
A: The ratio of the luminous flux emitted by the light source to the electrical power consumed.
Symbol: ηv, η, unit: lumens / watt (lm / W)
20. What are the electrical numbers of the transmission line?
Answer: Four items of resistance, reactance, conductance and susceptance.
21. What is an incandescent (electric) light?
A: A lamp that emits light to an incandescent state by energization.
22. What is a vacuum light?
A: The incandescent lamp that works in the vacuum glass bulb.
23. What is a gas-filled lamp?
A: An incandescent lamp that works in a glass bulb filled with nitrogen or inert gas.
24. What is a tungsten halogen lamp?
A: An incandescent lamp containing a part of halogen elements or halides in the filling gas.
25. What is a general lighting bulb?
A: The incandescent lamp used for general lighting in homes, streets and factories and mines can be transparent or frosted, milky or white.
26. What is a discharge lamp?
Answer: A lamp that emits light by gas, metal vapor or a mixture of several gases and metal vapor.
27. What is a glow discharge lamp?
Answer: A lamp that emits light by glow discharge.
28. What is a metal vapor (discharge) lamp?
Answer: Lamps that emit light by metal vapor discharge, such as mercury (vapor) lamps, sodium (vapor) lamps, etc.
29. What is a mercury (vapor) lamp?
Answer: A lamp that emits light by mercury vapor discharge.
30. What is a low-pressure mercury (vapor) lamp?
Answer: When the discharge is stable, the mercury vapor has a partial pressure of less than 102 Pa mercury (vapor) lamp.
31. What is a high-pressure mercury (vapor) lamp?
Answer: When the discharge is stable, the partial pressure of mercury vapor reaches or exceeds 10?Pa of mercury (vapor) lamp.
32. What is an ultra-high pressure mercury (vapor) lamp?
Answer: When the discharge is stable, the partial pressure of mercury vapor reaches or exceeds 10?Pa of mercury (vapor) lamp.
33. What is fluorescent high pressure mercury (vapor) lamp?
Answer: High-pressure mercury (vapor) lamps coated with fluorescent substances in the outer glass envelope.
34. What is a self-ballasted fluorescent high-pressure (steam) lamp?
A: The lamp is equipped with a fluorescent high-pressure mercury (vapor) lamp that can act as a ballast for the ballast.
35, what is fluorescent light?
A; mainly a discharge lamp that emits a phosphor layer by ultraviolet radiation generated by discharge.
36. What is a preheating start-up fluorescent lamp?
A: A fluorescent lamp that activates the lamp by preheating the cathode.
37. What is a quick-start fluorescent lamp?
Answer: The fluorescent lamp that is activated quickly when the lamp is turned on by using the structure and attachment of the lamp.
38. What is the instantaneous start of fluorescent light?
A: Hot cathode fluorescent lamps that can be directly activated without preheating the cathode.
39. What is a xenon lamp?
Answer: A discharge lamp that is mainly illuminated by helium discharge.
40, what is high (gas) pressure xenon lamp?
Answer: When the discharge is stable, the xenon pressure in the lamp reaches a xenon lamp of about 10?Pa.
41. What is a super high (gas) pressure lamp?
Answer: When the discharge is stable, the xenon pressure in the lamp reaches 10æ°™Pa.
42. What is a sodium (vapor) lamp?
Answer: It is mainly a discharge lamp that emits light by sodium vapor discharge.
43. What is a high pressure sodium (vapor) lamp?
Answer: When the discharge is stable, the partial pressure of sodium vapor in the lamp reaches 10?Pa sodium lamp.
44. What is a metal halide lamp?
Answer: A discharge lamp that emits light by discharging a mixture of metal vapor and metal halide decomposition products.
45, what is the lamp?
Answer: A part of a lamp that is attached to the lamp holder to connect the lamp to the power source.
46. ​​What is a screw-type lamp holder?
Answer: The lamp cap that is connected to the lamp holder with a round thread is marked with an "E".
47. What is a socket type lamp holder?
Answer: The lamp holder that is connected to the lamp holder by the pin is marked with "B".
48, what is the lamp holder?
A: The position of the lamp and the device that connects the lamp to the power supply.
49. What is a moisture-proof lamp holder?
A: Lamp holders for humid environments and outdoor use. The performance of this lamp holder is not affected by rain and humid weather when in use.
50. What are the basic requirements for road lighting sources?
A: It should have the characteristics of long life, high luminous efficiency, reliability and consistency, and the color rendering and color appearance should meet the requirements of specific lighting sections or places.
51. What are the principles of choosing a light source for road lighting?
Answer: 1) High-pressure sodium lamps should be used for the trunk roads.
2) Identify suburban highways with low color requirements. Low-speed sodium lamps should be used for expressways.
3) Metal halide lamps or mixed-light lighting should be used in places with high color recognition requirements such as downtown areas and commercial streets.
4) Fluorescent high-pressure sodium lamps can be selected for the lighting requirements and the roads with fewer vehicles and the roads in residential areas.
52. What is the significance of lighting maintenance?
Answer: Lighting facilities (including power supply lines, electrical equipment and lamps, etc.) should be regularly maintained and maintained to maintain a good, safe and reliable operating state to produce good lighting and social effects.
53. How to express the lighting rate calculation formula?
A: Lighting rate = total number of spot checks - number of lights off / total number of spot lights × 100%
54. How is the current electric light source used for illumination classified according to the principle of illumination?
Answer: It is divided into two categories: heat radiation source and gas discharge source.
55. Which components are the incandescent bulbs mainly composed of?
Answer: The incandescent lamp is mainly composed of a glass bulb, a filament, a glass bracket and a lamp holder.
56. Is the vacuum inside the incandescent bulb shell vacuum?
A: The 40W incandescent bulb is vacuum inside, and the incandescent bulbs of 60W and above are filled with inert gas.
57. Why should the incandescent bulb be filled with inert gas?
A: The purpose of filling the bulb with an inert gas is to reduce the evaporation of the tungsten wire. Tungsten encounters an inert gas block during evaporation, and a portion of the tungsten particles are folded back onto the filament. After the evaporation is reduced, the operating temperature of the filament can be increased accordingly, thereby improving the luminous efficacy of the bulb.
58. Which components are the high-pressure mercury bulbs mainly composed of?
Answer: The high-pressure mercury lamp mainly consists of a lamp cap, a hard glass casing (with phosphor coated inside), a main electrode, an auxiliary electrode (trigger pole), a quartz glass discharge tube, and a resistor.
59. Which parts are the high-pressure sodium bulbs mainly composed of?
Answer: The high-pressure sodium lamp mainly consists of a lamp holder, a hard glass casing, a ceramic discharge tube, a bimetal, and a metal bracket.
60. Which components are the main components of low-voltage fluorescent lamps?
Answer: Low-voltage fluorescent tubes mainly have pins, hard glass tubes (with phosphor inside, phosphor in tubes), oxide cathodes, and exhaust pipes.
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61. Why does the high-pressure mercury lamp start to restart immediately after it is extinguished, and it takes a while to light normally?
Answer: Because the high-pressure mercury lamp bulb is extinguished after the normal ignition point, the mercury vapor pressure in the discharge tube is very high. When the bulb is not cooled, the corresponding starting voltage is very high, so even if the lamp is energized immediately after the lamp is turned off, the lamp cannot be turned on immediately. Hui, usually takes 5~10 minutes, until the bulb cools, the mercury vapor in the lamp condenses before it can re-light.
62. What are the precautions when using high pressure mercury lamps?
Answer: 1) The power supply voltage allows the offset value to be plus or minus 5%.
2) The bulb can be ignited at any position, but when ignited in the horizontal position, the luminous flux will be reduced by 7%, and the lamp is easy to self-extinguish
3) After the outer glass shell is broken, the discharge tube can still illuminate, but it cannot be used for illumination, and a large amount of ultraviolet radiation is harmful to the human body.
4) The luminaire should be considered for heat dissipation
5) The bulb should be used with the ballast of the corresponding specifications and suitable lamps.
63. What are the disadvantages of incandescent lamps?
A: Advantages: low cost; easy to use, no need for any accessories for lighting; can be turned on and off, soft light color, high color rendering index; brightness adjustment; easy maintenance.
Disadvantages: low luminous efficiency; relatively high requirements for power supply voltage.
64. What are the disadvantages of high pressure sodium lamps?
Answer: Advantages: high luminous efficiency; less ultraviolet radiation; good fog permeability; long life.
Disadvantages: Poor color rendering; high starting voltage; high cost.
65. Why does the internal trigger high-pressure sodium lamp turn off immediately after it goes out, it takes a while to light normally?
Answer: Because the internal trigger high-pressure sodium lamp bulb is extinguished after the normal ignition point, the vapor pressure in the arc tube is very high, and the induced electromotive force on the ballast is insufficient. Therefore, the ignition point must be started after the bulb is cooled.
66, what is the electrodeless discharge lamp?
A: A gas discharge lamp without an electrode is called an electrodeless discharge lamp. Also called induction light.
67. What is the working principle of the electrodeless discharge lamp?
Answer: After the electrodeless discharge lamp is energized, the high-frequency magnetic field generated in the lamp cap is coupled to the gas in the lamp housing through the high-frequency coil, and the electrons and ions in the gas are used to move.
68. What is the starting principle of the internal trigger high pressure sodium lamp?
Answer: The inner trigger high-pressure sodium lamp bulb is equipped with a heating coil and a bimetal trigger switch, and the trigger switch is connected in parallel with the arc tube. When the bulb is powered on, the current passes through the normally closed contact of the trigger switch, and the bimetal is bent by heat, causing the normally closed contact to open, and the current is zero in the circuit at the moment of disconnection, and is generated at both ends of the ballast. The induced electromotive force, which is superimposed with the supply voltage, produces a pulsed high voltage that breaks down the gas in the arc tube and ignites the bulb.
69. Why is the lifetime of the internally triggered high pressure sodium lamp lower than that of the external trigger?
Answer: The life of the internally triggered high pressure sodium lamp depends on the heating coil inside the bulb. Although the life of the bulb arc tube can reach more than 20,000 hours, the heating coil is blown and the bulb cannot be lit; the externally triggered high pressure sodium lamp has no heating coil. Its life depends entirely on the arc tube, so the lifetime of the internally triggered high pressure sodium lamp is lower than the external trigger.
70, what is the radiation (shooting) energy?
A: Energy emitted, transmitted or received in the form of radiation. Symbol: Q, Qe, unit: Joule (J).
71. What is the radiation (radiation) power and the radiation (radiation) flux?
A: The power transmitted, transmitted or received in the form of radiation. Symbol: P (Φe, Φ), unit: watt [special] (W).
72. What is the radiation intensity?
Answer: The ratio of the radiant flux emitted by a point source (or radiating surface element) in a solid angle element containing a given direction to the solid angle element. Symbol: I, IeIe = dΦe / dω, unit: watt [special] / sphericity (W / Sr).
73. What is spectral light efficiency?
A: The ratio of the radiant fluxes of two radiations with wavelengths λm and λ that cause the light intensity to feel equal under certain luminosity conditions, λm is chosen to be at the maximum ratio of one. Symbol: V(λ) for bright vision and Vˊ(λ) for dark vision.
74, what is the luminous flux?
A: The amount derived from the product of the radiance Фe(λ) and the standard spectral luminous efficiency V(λ). In bright vision, the luminous flux can be expressed by the following formula: Φ = Km ∫ Φe (λ) oV (λ) d λ Symbol: Φ, Φv, unit: lumen (lm).
Where: Φe(λ)- corresponds to the radiant flux contained between λ and +dλ;
V(λ)-CIE spectral luminous efficiency, its value is a function of λ;
The maximum value of the Km-spectral optical performance curve K(λ), according to international protocol, at a wavelength of 555 nm, Km is 638 lm/W.
75, what is the (light) light intensity (light source in a given direction)?
Answer: The ratio of the luminous flux emitted by the light source to the solid angle element in the solid angle element in a given direction. Symbol: IvI, Iv = dΦv / dω, unit: kan [Dera] / (cd).
76, what is (light) brightness?
A: The ratio of the luminous intensity of a bin in a given direction to the orthographic area of ​​the bin on a plane perpendicular to a given direction.
Symbol: L (Lv) unit: kan [dra] / square meter (cd / m2).
77, what is the (light) light efficiency (light source)?
Answer: The ratio of the luminous flux emitted by the light source to the power consumed.
Symbol: ηv, η, unit: lumens / watt (lm / W)
78, what is the color rendering of the light source?
A: The degree to which an object is illuminated when illuminated by a light source and when illuminated with a standard light source under certain conditions.
79. What is the color rendering index of the light source?
A: Under certain conditions, when an object is illuminated with a light source and illuminated with a standard light source, its color conforms to the measure of degree, and its magnitude is represented by a number.
80, what is the discharge?
Answer: Electromagnetic radiation generated by carriers under the action of an electric field force to cause current to flow through a gas or metal vapor.
81. What is glow discharge?
Answer: A discharge in which the secondary electron emission of the cathode is much larger than the thermal electron emission is characterized by a large cathode drop (70 V) and a small current density.
82, what is arc discharge?
A: The cathode drop is much smaller than the glow discharge. In the case of arc discharge, the electron emission of the cathode may be caused by simultaneous or separate action for various reasons (hot electron emission, field emission, etc.), and secondary electron emission accounts for only a small portion.
83, what is the arc?
Answer: The light column in the arc discharge.
84. What is the maintenance rate?
Answer: The ratio of the luminous flux of the light source to the specified time and the initial luminous flux.
85, what is the life of the light source?
A: According to a certain technical requirement, the cumulative ignition time of the light source before the light source becomes invalid or considered invalid.
86, what is the rated life of the light source?
A: The design life of the lamp is determined by the life test of the same type of lamp.
87. What is the average life of the light source?
Answer: The arithmetic mean of the life measured by the same batch of life test lamps.
88. What is the median life of the light source?
Answer: In the life test light of batch N, according to the order of damage of the lamp, the life of the [(N-1)/2+1] lamps (when N is odd) or N/2 and (N/) The half of the sum of the life of 2+1) lamps (when N is even) is called the median lifetime of the batch of lamps.
89. What is the aging of the light source?
A: In order to stabilize the parameters of the lamp, the initial lighting is performed under certain conditions.
90, what is the start time of the light source?
A: Turn on the power switch of the discharge lamp until the time it takes for the lamp to start working.
91. What is the restart voltage of the light source?
Answer: Disconnect the power after the discharge lamp is stable, and the time from when the power is turned on again to when the lamp restarts.
92. What is the restart voltage of the light source?
A: The minimum voltage required between the electrodes when the discharge lamp begins to discharge continuously.
93. What is the lamp voltage?
A: The voltage applied to the light source cap contacts.
94. What is the rated voltage of the light source?
A: The design working voltage of the lamp (DC or AC RMS).
95, what is the cathode preheating current?
A: The current applied to the cathode of the preheated start-up fluorescent lamp to the operating temperature of the normal emitted electrons.
96. What is the lamp current?
Answer: When the light source is working stably, the current through the light source cap contacts.
97. What is the rated current of the light source?
A: The design current of the lamp at rated voltage.
98, what is the rated power of the light source?
A: The design power of the lamp.
99. What is the rated voltage, rated current and rated power of the electric light source?
Answer: The voltage or voltage range indicated on the electric light source is called the rated voltage; the current indicated on the electric light source is called the rated current; the power indicated on the electric light source is called the rated power.
100. What safety signs should be provided on the electric light source?
A: The source mark (manufacturer name or trademark) and the type of electric light source that represents the rated voltage, rated current, rated power or other rated parameters of the electric light source.
101. What safety signs should be placed on the outer or outer packaging of the electric light source?
A: Source mark, electric light source model, ignition position of electric light source (if there is a limit) and safe transportation mark.
What is the creepage distance between the housing of the 102, E27 and E40 bases and the charged body?
Answer: The creepage distance between the housing of the E27 base and the charged body is 3mm. The creepage distance between the housing of the E40 base and the charged body is 5mm.
103. What is the maximum temperature rise of an incandescent lamp head used for lighting in a street?
Answer: The maximum temperature rise of the incandescent 60W lamp head used for lighting in the street is 120 °C; the maximum temperature rise of the incandescent lamp 100W lamp for the street lighting in the neighborhood is 130 °C.
104, what is called zero?
Answer: The connection between the metal casing of the electrical equipment and the electrical equipment and the system neutral is called zero.
105, what is the grounding device?
Answer: The grounding device is a transition device connecting the electrical device to the earth. It is specially designed for the leakage current and grounding short-circuit current device. It includes the grounding body and the grounding wire.
106, what is lightning protection grounding? What parts of the lightning protection grounding device are included?
Answer: The grounding for the purpose of quickly introducing the lightning current into the earth to prevent lightning damage is called lightning protection grounding. The grounding device includes the following parts:
1) Lightning receiving device: directly or indirectly accept lightning metal rods (lighting devices), such as lightning rods, lightning protection belts (net), overhead ground lines and lightning arresters.
2) Ground wire (down conductor): A metal conductor used to connect the lightning receiving device to the grounding device.
3) Grounding device: the sum of the grounding wire and the grounding body.
107. What are the requirements for the grounding device?
Answer: The buried depth and layout of the grounding device shall be constructed according to the design requirements. Generally, the top of the grounding body buried in the ground should be 0.5~0.8m away from the ground.
1) When burying, the lower end of the angle steel should be sharpened, and the lower end of the steel pipe should be processed into a pointed or round tube to be flattened vertically into the ground, and the flat steel should be placed underground to be placed.
2) Before burying, dig a trench with a width of 0.6m and a depth of 1m, then drive the grounding body into the ground, and the upper end exposes the bottom of the trench by 0.1~0.2m to weld the grounding wire.
3) Before burying, all the connecting parts must be inspected and must be welded firmly by electric welding or gas welding. The contact surface should not be less than 10cm2, and soldering should not be used.
4) After embedding, backfill the new soil around the grounding body, and do not fill in the masonry coke. In order to measure the grounding resistance, the wiring clamp should be installed in the appropriate position for the purpose of measuring the grounding resistance.
5) If the grounding pipe or the metal grounding member of the building is used as a natural grounding body, it should be ensured that there is good contact under all circumstances.
108, what is the over voltage?
A: Due to external (such as lightning) and internal (such as fault trip or normal operation), there is a short-term voltage rise that is harmful to insulation. This voltage rise is called over-voltage.
109. What lightning protection equipment is installed in general substations?
Answer: The substation is generally equipped with a lightning protection device with lightning rods or lightning protection lines, as well as valve-type arresters, magnetic blow arresters and corresponding line protection segments installed at the corresponding voltage levels, namely overhead ground lines and tubular arresters. Or spark gap and grounding device.
110, what is grounding?
Answer: In the power system, the electrical connection between the neutral point of the electrical equipment and the electrical equipment, the outer casing or the bracket and the conductor for the grounding device is called grounding.
111, what is the work ground?
A: Under normal circumstances, in order to ensure the reliable operation of electrical equipment, a certain point in the power system must be grounded, called the working ground.
112, what is the protection ground?
Answer: In order to prevent electric shock caused by electrical equipment insulation damage, connect the unheated metal casing or frame to the earth under normal conditions, which is called protective grounding.
113, what is the grounding resistance?
Answer: It refers to the ratio of the ground voltage to the ground current of the grounding part of the electrical equipment.
114. Select the cross-sectional area of ​​the flat steel buried in the underground part.
Answer: The cross-sectional area of ​​the flat steel buried in the underground part should be not less than 48mm2, and the diameter of the round steel should not be less than 8mm.
115. Select the cross-sectional area of ​​the flat steel of the grounding part of the indoor exposed part.
Answer: The cross-sectional area of ​​the flat steel of the indoor exposed part of the grounding wire should be not less than 24 mm2, and the diameter of the round steel should not be less than 5 mm.
116. Select the cross-sectional area of ​​the independent lightning rod grounding wire.
Answer: The cross-sectional area of ​​the independent lightning rod grounding wire is 25 mm2 for copper wire and 35 mm2 for steel wire.
117. Select the cross-sectional area of ​​the grounding wire of the lighting device to be laid.
Answer: The cross-sectional area of ​​the bare copper wire grounding wire of the device laid by the device should be no less than 4 mm2, the diameter of the steel wire to be mounted should be not less than 4 mm, and the cross-sectional area of ​​the insulated copper wire should not be less than 2.5 mm2; the cross-sectional area of ​​the grounding wire of the lighting device should not be Less than 1.5 mm2.
118, what is protection and zero?
Answer: In the low-voltage three-phase four-wire system, the electrical equipment is not charged with a metal casing, and the wire is directly connected to the neutral wire, and the protection is connected to zero.
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