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GB 50794-2012: Code for construction of PV power station
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Code for construction of PV power station
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Basic data | Standard ID | GB 50794-2012 (GB50794-2012) | | Description (Translated English) | Code for construction of PV power station | | Sector / Industry | National Standard | | Classification of Chinese Standard | P61 | | Classification of International Standard | 27.100 | | Word Count Estimation | 77,765 | | Quoted Standard | GB 50017; GB 50018; GB 50026; GB/T 50107; GB 50119; GB 50141; GB 50147; GB 50148; GB 50149; GB 50150; GB 50166; GB 50168; GB 50169; GB 50171; GB 50172; GB 50173; GB 50201; GB 50202; GB 50203; GB 50204; GB 50205; GB 50207; GB 50209; GB 50210; GB 50233; GB | | Regulation (derived from) | Ministry of Housing and Urban Notice No. 1429 | | Issuing agency(ies) | Ministry of Housing and Urban-Rural Development of the People's Republic of China; General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China | | Summary | This Chinese standard applies to new construction, renovation and expansion of the ground and the roof grid -connected PV power stations, not for building integrated photovoltaic power generation project. | GB 50794-2012: Code for construction of PV power station---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
1 General
1.0.1 In order to ensure the construction quality of photovoltaic power station projects, promote the improvement of engineering construction technology, and ensure the safety and reliability of photovoltaic power station construction, this specification is formulated.
1.0.2 This specification is applicable to newly built, rebuilt and expanded ground and roof grid-connected photovoltaic power stations, and not applicable to building-integrated photovoltaic power generation projects.
1.0.3 Before the construction of the photovoltaic power station, the construction organization design documents should be compiled, and a special emergency plan should be formulated.
1.0.4 The construction of photovoltaic power station projects shall not only comply with this specification, but also comply with the current relevant national standards.
2 terms
2.0.1 PV module
Refers to the smallest indivisible solar battery combination device with packaging and internal connection, which can provide direct current output alone. Also known as solar cell components.
2.0.2 PV string PV string
In a photovoltaic power generation system, several photovoltaic modules are connected in series to form a circuit unit with a certain DC output voltage. It is called component string or group string for short.
2.0.3 PV supporting bracket
A special bracket designed for placing, installing and fixing photovoltaic modules in a photovoltaic power generation system. Referred to as the bracket.
2.0.4 Square array (photovoltaic square array) array (PV array)
A DC power generation unit composed of several solar cell modules or solar panels mechanically and electrically assembled together in a certain way and with a fixed support structure. Also known as photovoltaic array.
2.0.5 combiner-box
In the photovoltaic power generation system, several photovoltaic modules are connected in series and parallel and then connected.
2.0.6 tracking system tracking system
Through the combined action of mechanical, electrical, electronic circuits and programs, it is a device that adjusts the spatial angle of the photovoltaic module plane to realize tracking of incident sunlight to increase the power generation of photovoltaic modules.
2.0.7 Inverter inverter
A device that converts direct current into alternating current in a photovoltaic power station.
2.0.8 PV power station
A power generation system that directly converts solar radiation energy into electrical energy by using the photovoltaic effect of solar cells.
2.0.9 grid-connected PV power station
Photovoltaic power stations connected directly or indirectly to the public grid.
3 Basic Regulations
3.0.1 The following conditions should be met before starting work.
1 Before the construction of the project starts, the construction unit shall obtain relevant construction permit documents.
2 The construction site should have the conditions of water, electricity, road, telecommunications and site leveling.
3 The qualifications of the construction unit, qualifications of special operators, construction machinery, construction materials, measuring instruments, etc. should be reported to the supervisory unit or construction unit for review.
4 The construction drawings necessary for the start of construction shall pass the joint review; the design disclosure shall be completed; the construction organization design and major construction plans shall have been approved; the project division and quality evaluation standards shall be determined.
5 The construction unit shall complete the layout of temporary construction facilities according to the requirements of the general construction layout drawing.
6 Engineering positioning measurement datum should be established.
3.0.2 The specifications of equipment and materials shall meet the design requirements, and unqualified equipment and materials shall not be used in the project.
3.0.3 The qualification certificates, manuals, test records, accessories, spare parts, etc. of the equipment and materials entering the site shall be complete.
3.0.4 The transportation and storage of equipment and equipment shall comply with the requirements of this specification; when the product has special requirements, it shall meet the special provisions of the product requirements.
3.0.5 Concealed works shall meet the following requirements.
1 Before the hidden project is concealed, the construction unit should conduct self-inspection according to the project quality assessment and acceptance standards, and submit an acceptance application to the supervisor after passing the self-inspection.
2 Concealment can only be carried out after passing the acceptance check by the supervisory engineer, and the concealed project acceptance visa form should be filled out in accordance with the relevant requirements of the current industry standard "Regulations for Acceptance and Evaluation of Construction Quality in Electric Power Construction" DL/T 5210.
3.0.6 The construction process records and related test records should be complete.
4 civil works
4.1 General provisions
4.1.1 The construction of civil works shall be carried out in accordance with the relevant provisions of the current national standard "Unified Standards for Construction Quality Acceptance of Construction Engineering" GB 50300.
4.1.2 The surveying and setting-out work shall be carried out in accordance with the relevant provisions of the current national standard "Code for Engineering Surveying" GB 50026.
4.1.3 When raw materials used in civil works enter the factory, the following tests shall be carried out.
1 When the raw materials enter the site, the variety, specifications, appearance and size should be checked and accepted. The material packaging should be intact, and there should be product qualification certificates, Chinese manuals and relevant performance test reports.
2 When the steel bar enters the site, the test piece should be taken for mechanical performance inspection according to the current national standard "Steel for Reinforced Concrete" GB 1499 and other regulations.
3 When the cement enters the site, its variety, grade, packaging or bulk warehouse number, date of delivery, etc. should be inspected, and its strength, stability and other necessary performance indicators should be re-inspected. Salt Cement" GB 175 and other regulations.
4.1.4 When the country stipulates or the contract stipulates that the witness test should be carried out on the material or when there is a dispute over the quality of the material, the witness test should be carried out.
4.1.5 Raw materials should be classified and stored after entering the site. Materials such as steel bars and cement should be stored in a dry place that can avoid rain and snow, and various protective measures should be taken.
4.1.6 The construction of concrete structures shall comply with the relevant provisions of the current national standard "Code for Construction Quality Acceptance of Concrete Structures" GB 50204.
4.1.7 For concrete mixed with admixtures, the relevant quality and application technology shall comply with the relevant provisions of the current national standard "Concrete Admixtures" GB 8076 and "Technical Specifications for the Application of Concrete Admixtures" GB 50119.
4.1.8 The winter construction of concrete shall comply with the relevant provisions of JGJ/T 104, the current industry standard "Code for Winter Construction of Construction Engineering".
4.1.9 For buildings (structures) that require settlement observation, settlement observation signs shall be set up in time, and settlement observation records shall be made well.
4.1.10 Concealed works may include. steel bar inspection before concrete pouring, quality inspection before backfilling of concrete foundation groove, etc. The acceptance of concealed works shall meet the requirements of Article 3.0.5 of this code.
4.2 Earthworks
4.2.1 The construction of earthworks should implement the relevant provisions of the current national standard "Code for Construction Quality Acceptance of Building Foundation Engineering" GB 50202, and the construction of earthworks for deep foundation pit foundations should also implement the current industry standard "Technical Regulations for Building Foundation Pit Support" "Relevant provisions of JGJ 120.
4.2.2 In case of blasting works in the construction of earthworks, it shall be implemented in accordance with the relevant provisions of the current national standard "Code for Construction and Acceptance of Earthworks and Blasting Works" GB 50201.
4.2.3 Before the construction of the project, the elevation control network and plane control network of the whole site shall be established. Necessary protective measures shall be taken for elevation control points and plane control points, and retesting shall be carried out regularly.
4.2.4 Before earthwork excavation, the original underground facilities shall be marked and corresponding protective measures shall be taken.
4.2.5 When the support foundation adopts the full-length excavation method, under the premise of ensuring the safety of the foundation pit, the earthwork that needs to be backfilled should be stacked nearby, and the excess earthwork should be transported to the spoil site for stacking.
4.2.6 If there is a requirement for the compactness of the backfill, it shall be qualified by testing.
4.3 Bracket foundation
4.3.1 The construction of concrete independent foundations and strip foundations shall be carried out in accordance with the relevant provisions of the current national standard "Code for Construction Quality Acceptance of Concrete Structure Engineering" GB 50204, and shall meet the following requirements.
1 Before concrete pouring, the foundation pit should be checked and accepted, and the axis, foundation pit size, and base elevation should meet the design requirements. The floating soil and debris in the foundation pit should be cleaned up.
2 After the basic formwork is removed, the appearance quality and dimensional deviation should be checked, and the defects should be dealt with in time.
3 The exposed metal embedded parts shall be treated with anticorrosion.
4 When pouring concrete for the same support foundation, it is advisable to complete the pouring at one time. The intermittent time of concrete pouring should not exceed the initial setting time of the concrete. If the initial setting time of the concrete exceeds the initial setting time of the concrete, construction joints should be treated.
5 After the concrete pouring is completed, effective maintenance measures should be taken in time.
6.Before the support foundation is installed, the concrete shall be cured to reach 70% strength.
7 The concrete construction of the support foundation shall be divided into several inspection batches according to the working shift and construction section according to the principle of being consistent with the construction method and facilitating the control of construction quality.
8 The precast concrete foundation should not have dimensional deviations that affect the structural performance and use functions. For parts that exceed the allowable dimensional deviation and affect structural performance and use functions, they should be treated according to the technical treatment plan, and re-inspected and accepted.
4.3.2 The construction of the pile foundation shall implement the current national standard "Code for Construction Quality Acceptance of Building Foundation Engineering" GB 50202 and the relevant provisions of "Technical Specifications for Building Pile Foundation" JGJ 94, and shall meet the following requirements.
1.The appearance and quality of the pile body should be inspected after entering the site and before construction for the pressure (driving and rotating) piles.
2 The position of the pile-forming equipment should be stable, and the equipment should not be tilted or shifted during the pile-forming process.
3 During the pile pressing process, the pressure, pile verticality and pressing depth should be checked.
4 During the construction process of pressing (driving and screwing) piles, the pile body should be kept vertical and should not be loaded eccentrically.
5.The depth control scale shall be set on the drill tool for drilling the cast-in-place pile, and shall be observed and recorded during construction.
6 During the construction of cast-in-situ piles, the whole process of hole formation, slag removal, placement of steel cages, and pouring of concrete (cement slurry) should be inspected.
7 Concrete (cement slurry) should be poured as soon as possible after the hole quality inspection of the cast-in-situ pile is qualified.
8 For the strength and bearing capacity detection of the pile-type support foundation, it is advisable to carry out random inspections in different areas according to the principle of controlling construction quality.
4.3.3 The construction of the roof support foundation shall meet the following requirements.
1 The construction of the support foundation shall not damage the main structure of the original building and the waterproof layer.
2 The support foundation of the new roof should be constructed together with the main structure.
3 When the steel structure is used as the support foundation, the construction of the roof waterproofing project should be completed before the construction of the steel structure support, and the roof waterproof layer should not be damaged during the construction of the steel structure support.
4 If it affects the waterproof structure of the original building, it should be re-waterproofed according to the original waterproof structure.
5 The grounded flat steel and angle steel should be treated with anticorrosion.
4.3.4 The deviation of support foundation and embedded bolts (embedded parts) shall meet the following requirements.
1 The size tolerance of concrete independent foundation and strip foundation shall comply with the provisions in Table 4.3.4-1.
2 The allowable deviation of pile foundation size shall comply with the provisions in Table 4.3.4-2.
3 The permissible deviation of the embedded bolts (embedded parts) of the support foundation shall comply with the provisions in Table 4.3.4-3.
4.4 Site and underground facilities
4.4.1 The road construction of the photovoltaic power station should be carried out in a combination of permanent and temporary.
4.4.2 The waterproof slope and construction quality of the road shall meet the design requirements.
4.4.3 In addition to meeting the design requirements, the construction of cable trenches should also meet the following requirements.
1 Waterproof measures should be taken for the reserved holes in the cable trench.
2 The construction quality of deformation joints in cable trenches should be strictly controlled.
3 Waterproof measures should be taken for the outdoor cable trench cover.
4.4.4 The construction of water supply and drainage pipelines in the station area shall meet the following requirements.
1.The buried water supply and drainage pipes should be considered as a whole with the construction of roads or buildings on the ground, first underground and then on the ground. After the pipeline is backfilled, secondary excavation should be avoided as far as possible. After the pipeline is buried, it should be marked on the ground.
2 The construction of water supply and drainage pipelines shall comply with the relevant provisions of the current national standard "Code for Construction and Acceptance of Water Supply and Drainage Pipeline Engineering" GB 50268.
4.4.5 The rainwater wellhead should be constructed according to the design requirements. If the design documents are not clear, the site construction should be consistent with the site elevation; the water collection well should generally be 20mm-50mm lower than the site, and the local site slope around the stormwater outlet should be controlled at 1%. ~3%; water filtration measures should be taken around the water collection outlet during construction.
4.5 Buildings (structures)
4.5.1 The buildings (structures) of the photovoltaic power station shall include complex buildings, power distribution rooms, booster stations, inverter cells, gates and walls, etc.
4.5.2 The construction of concrete for buildings (structures) shall comply with the relevant provisions of the current national standard "Construction Quality Acceptance Code for Concrete Structure Engineering" GB 50204, and the concrete strength inspection shall comply with the current national standard "Concrete Strength Inspection and Evaluation Standard" GB/T The relevant provisions of 50107.
4.5.3 The construction of masonry works shall comply with the relevant provisions of the current national standard "Code for Acceptance of Construction Quality of Masonry Structure Engineering" GB 50203.
4.5.4 The construction of the roofing project shall comply with the relevant provisions of the current national standard "Code for Quality Acceptance of Roofing Projects" GB 50207.
4.5.5 The construction of ground works shall comply with the relevant provisions of the current national standard "Code for Acceptance of Construction Quality of Building Ground Works" GB 50209.
4.5.6 The construction of building decoration works shall comply with the relevant provisions of the current national standard "Code for Quality Acceptance of Building Decoration and Decoration Works" GB 50210.
4.5.7 The construction of ventilation and air-conditioning projects shall comply with the relevant provisions of the current national standard "Code for Acceptance of Construction Quality of Ventilation and Air-conditioning Projects" GB 50243.
4.5.8 The construction of the steel structure project shall comply with the relevant provisions of the current national standard "Code for Construction Quality Acceptance of Steel Structure Engineering" GB 50205.
5 Installation works
5.1 General provisions
5.1.1 The transportation and storage of equipment shall meet the following requirements.
1 In the process of hoisting and transportation, safety measures such as anti-overturning, anti-vibration and damage to the protective surface should be taken. If necessary, the installation equipment and vulnerable components can be removed and packaged separately for transportation. When the product has special requirements, it should still comply with the provisions of the product technical documents.
2 After the equipment arrives at the site, the following checks should be done.
1) The packaging and sealing should be good.
2) Open the box for inspection, the model and specifications should meet the design requirements, and the accessories and spare parts should be complete.
3) The technical documents of the product should be complete.
4) Visual inspection should be intact.
3 The equipment should be stored indoors or in a dry place that can avoid rain and snow, and protective measures should be taken.
4 During the storage period, it should be checked regularly and the protection work should be done well.
5.1.2 Installers should be trained in relevant installation knowledge.
5.1.3 The handover and acceptance during construction of photovoltaic power stations shall meet the following requirements.
1 The intermediate transfer project of photovoltaic power station construction may include. step-up station foundation, high and low voltage panel foundation, inverter foundation, power distribution room, support foundation, cable trench, secondary grouting for equipment foundation, etc.
2 When the civil engineering is delivered to the installation project, the civil engineering professional should fill in the "Intermediate Handover Acceptance Certificate", provide relevant technical information, and submit it to the installation professional for inspection. The intermediate handover acceptance certificate can be filled in according to the format in Appendix A of this specification.
3 The intermediate handover project should pass the quality inspection. For the projects that do not meet the handover conditions, the handover unit is responsible for rectification and improvement.
5.1.4 Concealed works of installation works may include. grounding devices, direct buried cables, high and low voltage panel busbars, transformer hanging covers, etc. The acceptance of concealed works shall be carried out in accordance with Article 3.0.5 of this code.
5.2 Bracket installation
5.2.1 The following preparatory work should be done before the bracket installation.
1 When the cast-in-place concrete support foundation is used, the support should be installed after the concrete strength reaches 70% of the design strength.
2 The following checks should be done after the support arrives at the site.
1) The appearance and anti-corrosion coating should be intact.
2) The model, specification and material should meet the requirements of the design drawings, and the accessories and spare parts should be complete.
3 Anti-corrosion work should be done for supports stored in corrosive places such as tidal flats and saline-alkali.
4 Before the bracket is installed, the installation unit shall check the horizontal deviation and positioning axis deviation of the foundation and embedded parts (embedded bolts) in accordance with the relevant requirements of the "Intermediate Handover Acceptance Certificate".
5.2.2 The installation of fixed brackets and manually adjustable brackets shall comply with the following regulations.
1 The installation and fastening of the bracket shall meet the following requirements.
1) The fastening degree of the support with section steel structure shall meet the requirements of the design drawings and the relevant provisions of the current national standard "Code for Construction Quality Acceptance of Steel Structure Engineering" GB 50205.
2) During the installation of the bracket, it should not be knocked forcibly, and the hole should not be gas-cut and reamed. For the bracket made of hot-dip galvanized material, it is not suitable to drill holes on site.
3) The anti-corrosion layer of the bracket should not be damaged during the installation of the bracket.
4) The adjustment action of the manually adjustable bracket should be flexible, and the adjustment range of the height angle should meet the design requirements.
2 The deviation of the inclination angle of the bracket should not be greater than ±1°.
3 The permissible deviation of fixed and manually adjustable bracket installation shall comply with the provisions in Table 5.2.2.
5.2.3 The installation of the tracking bracket shall meet the following requirements.
1 The tracking bracket and the foundation should be fixed firmly and reliably.
2 The allowable deviation of the installation of the tracking bracket shall comply with the provisions of the design documents.
3 The installation of the tracking bracket motor should be firm and reliable. The transmission part should move flexibly.
4 After the concentrating parts of the concentrating tracking system are installed, corresponding protective measures should be taken.
5.2.4 In addition to meeting the design requirements, the on-site welding process of the bracket shall also meet the following requirements.
1 The assembly, welding and anti-corrosion treatment of the bracket shall comply with the relevant provisions of the current national standard "Technical Specifications for Cold-Formed Thin-walled Steel Structures" GB 50018 and "Code for Design of Steel Structures" GB 50017.
2 After the welding work is completed, the weld seam should be inspected.
3 After the bracket is installed, the welding surface should be treated with anticorrosion according to the design requirements.
5.3 Photovoltaic module installation
5.3.1 The following preparatory work should be done before the installation of photovoltaic modules.
1 The installation of the bracket should be checked and accepted.
2 It is advisable to classify and string PV modules according to their voltage and current parameters.
3 The appearance and components of photovoltaic modules should be intact.
5.3.2 The installation of photovoltaic modules shall meet the following requirements.
1.Photovoltaic modules should be installed according to the model and specifications of the design drawings.
2 The torque value of the fixing bolts of the photovoltaic module shall meet the requirements of the product or design documents.
3 The allowable deviation of photovoltaic module installation shall comply with the provisions in Table 5.3.2.
5.3.3 The wiring between photovoltaic modules should meet the following requirements.
1 The number and path of photovoltaic module connections should meet the design requirements.
2 The indirect plug-in of the photovoltaic module should be firmly connected.
3 The connection between the external cable and the connector should be tinned.
4 After the photovoltaic modules are connected to the strings, the open-circuit voltage and short-circuit current of the photovoltaic module strings should be tested.
5.The connecting wires between photovoltaic modules can be fixed with brackets, and should be neat and beautiful.
6 Same—the positive and negative poles of photovoltaic modules or photovoltaic module strings should not be short-circuited.
5.3.4 It is strictly forbidden to touch the metal live parts of the photovoltaic module string.
5.3.5 It is strictly forbidden to connect photovoltaic modules in the rain.
5.4 Combiner box installation
5.4.1 The combiner box shall meet the following requirements before installation.
1 The components in the combiner box should be in good condition, and the connecting wires should not be loose.
2 All switches and fuses of the combiner box should be disconnected.
3 The insulation resistance between the inlet and outlet terminals of the combiner box and the ground terminal of the combiner box should not be less than 20MΩ.
5.4.2 The installation of the combiner box shall meet the following requirements.
1 The installation location should meet the design requirements. Brackets and fixing bolts should be anti-rust parts.
2 The vertical deviation of the combiner box installation should be less than 1.5mm.
5.4.3 Before connecting the cables of the photovoltaic module strings in the combiner box, it must be confirmed that there are obvious disconnection points on the photovoltaic module side and the inverter side.
5.5 Inverter installation
5.5.1 The following preparations should be made before inverter installation.
1 Before the inverter installed indoors is installed, the construction project should meet the following conditions.
1) The roof and floor should be constructed without leakage.
2) The construction of the indoor ground base should be completed, and the plastering elevation should be marked on the wall; there should be no water and sundries in the indoor channels; the doors and windows should be installed.
3) The work that may damage the installed equipment during decoration or the work that can no longer be decorated after equipment installation should be all completed.
2 The formwork, scaffolding, etc. that hinder the installation should be removed, and the site should be cleaned.
3 The concrete foundation and components shall reach the strength allowed for installation, and the quality of welded components shall meet the requirements.
4 The position and size of the embedded parts and reserved holes shall meet the design requirements, and the embedded parts shall be firm.
5 Check that the model and specification of the installed inverter are correct; the appearance of the inverter is intact.
6.The transported and positioned equipment should be ready and meet the load requirements.
7 When the large inverter is in place, check that the road is clear and there is enough space.
5.5.2 The installation and adjustment of the inverter shall meet the following requirements.
1 For the inverter fixed by the basic steel, the allowable deviation of the basic steel installation of the inverter shall comply with the provisions in Table 5.5.2.
2 After the basic section steel is installed, its top should be 10mm higher than the troweled ground. The basic section steel should have obvious and reliable grounding.
3 The installation direction of the inverter should comply with the design regulations.
4 The fixation between the inverter and the foundation steel should be firm and reliable.
5.5.3 Before wiring the AC side and DC side cables of the inverter, check the cable insulation and check the phase sequence and polarity of the cables.
5.5.4 Before connecting the cables on the DC side of the inverter, it must be confirmed that there is an obvious disconnection point on the side of the combiner box.
5.5.5 After the cable connection is completed, the reserved holes and cable nozzles of the inverter body should be sealed for fire protection.
5.6 Electrical secondary system
5.6.1 The installation and wiring of secondary equipment and cabinets shall comply with the relevant provisions of the current national standard "Code for Construction and Acceptance of Panels, Cabinets and Secondary Circuit Wiring of Electrical Installation Engineering" GB 50171, and shall also meet the design requirements.
5.6.2 The installation of communication, telecontrol, integrated automation, metering and other devices shall meet the technical requirements of the product.
5.6.3 The installation of security monitoring equipment should comply with the relevant provisions of the current national standard "Technical Specifications for Safety and Protection Engineering" GB 50348.
5.6.4 The installation of the DC system should comply with the relevant provisions of the current national standard "Code for Construction and Acceptance of Batteries in Electrical Installation Engineering" GB 50172.
5.7 Installation of other electrical equipment
5.7.1 The installation of high-voltage electrical equipment should comply with the relevant provisions of the current national standard "Code for Construction and Acceptance of High-Voltage Electrical Appliances in Electrical Installation Engineering" GB 50147.
5.7.2 The installation of power transformers and transformers should comply with the relevant provisions of the current national standard "Code for Construction and Acceptance of Power Transformers, Oil-immersed Reactors, and Transformers in Electrical Installation Engineering" GB 50148.
5.7.3 The construction of the busbar device shall comply with the relevant provisions of the current national standard "Code for Construction and Acceptance of Busbar Devices in Electrical Installation Engineering" GB 50149.
5.7.4 The installation of low-voltage electrical appliances should comply with the relevant provisions of the current national standard "Code for Construction and Acceptance of Low-Voltage Electrical Appliances for Electrical Installation Engineering" GB 50254.
5.7.5 The installation of environmental monitors and other electrical equipment shall comply with the technical requirements of design documents and products.
5.8 Lightning protection and grounding
5.8.1 The construction of the lightning protection system of the photovoltaic power station shall be carried out in accordance with the requirements of the design documents.
5.8.2 Photovoltaic power station connection...
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