The core function of a surge protector (SPD, also known as a lightning arrester) is to limit sudden transient overvoltages in the circuit, discharge surge currents, and prevent accidents such as damage to electrical equipment, circuit failures, and even fires. The installation scenarios mainly revolve around three core aspects: "where surges are likely to occur", "high-value/ sensitive equipment", and "compliance with safety standards". Specifically, they can be classified into the following categories, covering multiple scenarios such as households, industries, and public buildings: 

1. Mandatory Installation Requirements (Required Installation Scenarios)

According to national standards such as "Building Lightning Protection Design Code" (GB 50057) and "Low-Voltage Power Distribution Design Code" (GB 50054), the following scenarios must install surge protectors. This is a mandatory requirement. Failure to install will not meet the safety acceptance standards: 

Power supply entry points for various lightning protection buildings: For buildings of categories one, two, and three (such as high-rise buildings, factories, office buildings, residential buildings, etc.), at the main distribution box or main distribution cabinet where the low-voltage power lines (220V/380V) enter the building, a first-level surge protector must be installed to block the intrusion of external lightning surges into the building. 

Equipment terminals with outdoor lines connected: such as wired TV, broadband, telephone lines, monitoring lines, fire alarm lines, etc. Outdoor lines are prone to lightning-induced surges. Therefore, corresponding types of surge protectors (such as signal-type SPD) should be installed at the interface where the outdoor lines enter the building (such as the weak current box, the front end of the equipment). 

Electrical equipment in special places: such as gas stations, substations, distribution rooms, communication base stations, data centers, hospital operating rooms, fire control rooms, etc. The equipment in these places is highly precise and has special power consumption loads. In case of a surge accident, the consequences would be extremely serious. Therefore, according to the standards, multiple levels of surge protectors should be installed to achieve full-process protection. 

2. Environments/Situations Prone to Surge (Recommended to Install)

Although not strictly mandatory, as the probability of surge occurrence is extremely high, not installing it would lead to frequent damage to equipment. Therefore, it is recommended to install it first: 

Outdoor equipment and lines: Outdoor charging stations, outdoor lighting, garden lights, surveillance cameras, solar power supply systems, outdoor billboards, etc., are directly exposed to the outdoors and are susceptible to lightning strikes, heavy rainfall, and fluctuations in the power grid. Surge protectors need to be installed at the power input terminals of these devices. 

Unstable power grid areas: Rural areas, remote mountainous regions, areas near factories (large equipment startups and shutdowns can cause grid fluctuations), areas with frequent power outages/recoveries, where grid voltage fluctuates greatly and can generate operational surges (such as instantaneous high voltage generated by equipment startups/shutdowns and switch operations), surge protectors should be installed in the main household distribution box and factory workshop distribution boxes. 

Thunderstorm-prone areas: Regions with frequent thunderstorms (such as the rainy seasons in the south and mountainous areas). Whether it's residential buildings or commercial premises, external lightning strikes can induce surges through overhead lines and grounding bodies, which are highly likely to damage household appliances and electrical equipment. Therefore, dual protection measures should be implemented at the power inlet and the front end of critical equipment. 

3. Equipment-Sensitive/High-Value Scenarios (Recommended Installation)

The core of these scenarios is to protect high-value and high-precision equipment to prevent significant economic losses caused by surges. It is recommended to install them specifically: 

Home scene: The home is equipped with high-end appliances (such as smart TVs, refrigerators, air conditioners, washing machines), precision electronic devices (such as computers, servers, printers), and smart home systems (such as smart gateways, monitoring systems, and all-home smart control devices). The internal circuits of these devices are highly sophisticated and extremely sensitive to voltage fluctuations. Therefore, a total surge protector should be installed in the distribution box, and a plug-in surge protector can also be installed at the device sockets. 

Commercial/Industrial Scenarios: Data center servers, precision instruments, PLC control systems, frequency converters, medical equipment (such as CT machines, detectors), laboratory equipment, etc. These devices are of high value and have high precision requirements for operation. Once damaged by surges, not only will the repair costs be high, but they may also affect the normal operation of production and office work. Therefore, multiple levels of surge protectors (first level for external surges, second and third levels for internal operational surges) need to be installed. 

4. Supplementary Explanation (Key Installation Pre-requisites)

The surge protector can only function properly when it is paired with a good grounding system. If the grounding is poor (the grounding resistance does not meet the standards), even if the SPD is installed, it will not be able to effectively discharge the surge current, and it may even pose safety hazards. Therefore, when installing the SPD, it is necessary to ensure that the grounding system meets the standards (generally, the grounding resistance should be ≤ 4Ω, and in special locations, it should be ≤ 1Ω).

浪涌保护器（SPD，又称防雷器）的核心作用是限制电路中突发的瞬态过电压、泄放浪涌电流，避免电气设备损坏、电路故障甚至火灾等安全事故。其安装场景主要围绕“易产生浪涌”“设备价值高/敏感”“符合安全规范”三大核心，具体可分为以下几类，覆盖家庭、工业、公共建筑等多场景："},"attribs":{"0":"*0*1+3o"}},"apool":{"numToAttrib":{"0":["ai-extra","{"is_ai_gen":true,"rewrite_command":1}"],"1":["author","7585333134900595890"]},"nextNum":2}},"align":"left","type":"text","comments":[],"revisions":[],"hidden":false,"author":"7585333134900595890"}},"TaJvfWpsIdafOacpGXlc1SABnag":{"id":"TaJvfWpsIdafOacpGXlc1SABnag","snapshot":{"locked":false,"type":"heading2","comments":[],"revisions":[],"ai_extra":{"is_ai_gen":true,"rewrite_command":1},"children":[],"text":{"apool":{"numToAttrib":{"0":["ai-extra","{"is_ai_gen":true,"rewrite_command":1}"],"1":["author","7585333134900595890"]},"nextNum":2,"attribToNum":{"ai-extra,{"is_ai_gen":true,"rewrite_command":1}":0,"author,7585333134900595890":1}},"initialAttributedTexts":{"text":{"0":"一、法规/规范强制要求安装（必装场景）"},"attribs":{"0":"*0*1+j"},"rows":{},"cols":{}}},"align":"left","parent_id":"J9ZUdADalok2bRxIysBcMPm7n4f","hidden":false,"author":"7585333134900595890"}},"Uq3sfdy4GdFqhEcGDEOc6QEAn0g":{"id":"Uq3sfdy4GdFqhEcGDEOc6QEAn0g","snapshot":{"comments":[],"revisions":[],"author":"7585333134900595890","ai_extra":{"rewrite_command":1,"is_ai_gen":true},"text":{"apool":{"numToAttrib":{"0":["ai-extra","{"is_ai_gen":true,"rewrite_command":1}"],"1":["author","7585333134900595890"]},"nextNum":2,"attribToNum":{"ai-extra,{"is_ai_gen":true,"rewrite_command":1}":0,"author,7585333134900595890":1}},"initialAttributedTexts":{"text":{"0":"根据《建筑物防雷设计规范》（GB 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