최종 업데이트: 2026년 7월 17일 | 버전 1.1

요약: 실무 엔지니어링 관점에서의 IEC 62548

IEC 62548은 태양광 어레이 설계에 관한 핵심 국제 표준입니다.

현재 핵심 발행본은 다음과 같습니다. IEC 62548-1:2023, 2025년에 발행된 개정판 1을 포함합니다.

실무 엔지니어링 관점에서 IEC 62548은 다음과 같은 주요 태양광 어레이 설계 항목을 다룹니다.

• DC 어레이 배선
• 최대 시스템 전압
• 병렬 스트링 설계
• 과전류 보호
• 스위칭 및 절연
• 접지 규정
• 보호 장치 협조

가장 중요한 원칙은 간단합니다:

PV 어레이는 일반적인 작동 값이 아닌, 발생 가능한 최대 전기적 및 환경적 조건을 고려하여 설계되어야 합니다.

엔지니어는 혹한기 개방 전압, 병렬 스트링으로부터의 역전류, DC 스위칭 성능, 케이블 상태 및 보호 협조를 고려해야 합니다.

따라서 IEC 62548은 제품 체크리스트가 아닌 태양광(PV) 어레이 설계 프레임워크로 취급되어야 합니다.

이 가이드는 해당 표준을 실무 엔지니어링 관점에서 설명합니다.

목차

1. IEC 62548이란 무엇인가?
2. IEC 62548의 최신 버전
3. IEC 62548의 적용 범위
4. 최대 태양광(PV) 어레이 전압
5. 태양광(PV) 스트링 및 병렬 어레이 설계
6. 과전류 보호 및 gPV 퓨즈
7. PV DC 케이블 설계
8. 스위칭 및 DC 절연
9. 접지 및 본딩
10. 서지 보호 및 IEC 61643
11. PV 접속반(Combiner Box) 설계
12. 인버터 조정
13. 검사 및 문서화
14. 일반적인 IEC 62548 설계 오류
15. 실무 설계 워크플로우
16. IEC 62548 엔지니어링 체크리스트
17. 자주 묻는 질문
18. 최종 엔지니어링 권장 사항

1. IEC 62548이란 무엇인가?

IEC 62548 태양광 어레이의 전기 설계 및 안전을 논할 때 일반적으로 사용됩니다.

현재 발행본의 명칭은 다음과 같습니다:

IEC 62548-1: 태양광(PV) 어레이 – 제1부: 설계 요구사항

이 표준은 태양광 직류(DC) 시스템의 고유한 특성으로 인해 발생하는 설계 위험을 다룹니다.

태양광 어레이는 다음과 같은 이유로 일반적인 전기 회로와 다릅니다:

• 충분한 햇빛이 있을 때마다 전압을 생성함
• 낮은 온도에서 더 높은 개방 전압을 생성함
• 다수의 병렬 스트링을 포함함
• 긴 옥외 DC 케이블 경로를 사용함
• 1000V 또는 1500V DC에서 작동함
• AC 차단 후에도 전압이 유지됨

이러한 특성은 다음의 선정에 영향을 미침:

• 케이블
• gPV 퓨즈
• DC 스위치
• 아이솔레이터
• 서지 보호 장치
• 컴바이너 박스
• 인버터 연결

IEC 62548은 이러한 문제를 해결하기 위한 시스템 수준의 프레임워크를 제공합니다.

이 표준의 가치는 단순히 규격 준수 제품을 식별하는 데에만 있지 않습니다.

이 표준은 엔지니어가 전체 태양광 어레이를 어떻게 통합적으로 설계해야 하는지 이해하도록 돕습니다. 태양광 전기 보호 시스템.

2. IEC 62548의 현재 버전

많은 구형 기술 문서들은 여전히 다음을 참조하고 있습니다. IEC 62548:2016.

현재 엔지니어링 작업의 핵심 출판물은 다음과 같습니다:

현재 통합 출판물은 IEC 62548-1:2023+AMD1:2025.

일반 용어인 IEC 62548 은 업계 및 온라인 검색에서 여전히 널리 사용됩니다.

그러나 기술 문서에는 프로젝트에 사용된 실제 판본이 명시되어야 합니다.

이는 특히 다음 분야에서 중요합니다:

• 입찰 사양서
• EPC 기술 문서
• 준수 선언문
• 설계 보고서
• 검사 기록

엔지니어는 해당 프로젝트가 IEC 표준의 국가 또는 지역 채택 버전을 사용하는지 확인해야 합니다.

다음과 같은 일반적인 진술은:

IEC 62548에 따라 설계됨

관련 판본 및 채택된 표준을 명시하는 것보다 정확도가 떨어질 수 있습니다.

3. IEC 62548의 적용 범위는 무엇인가?

IEC 62548-1은 주로 태양광 어레이 설계에 중점을 둡니다.

이 표준의 적용 범위에는 다음과 같은 주요 주제가 포함됩니다:

• DC 어레이 배선
• 전기 보호 장치
• 개폐 장치
• 접지 규정

실제 시스템 측면에서, 이 표준은 태양광 어레이를 따라 최종 전력 변환 장비인 인버터까지의 경로를 따릅니다.

태양광 프로젝트의 모든 하위 시스템을 포괄한다고 가정해서는 안 됩니다.

예를 들어, 배터리 에너지 저장 장치는 다음과 같은 별도의 문제를 야기합니다:

• 배터리 고장 전류
• 배터리 관리
• DC 버스 보호
• 열 폭주 전이

더 광범위한 태양광(PV) 설치 요구 사항도 조정되어야 하며 IEC 60364-7-712:2025 적용 가능한 국가 전기 규정을 준수해야 합니다.

이는 중요한 공학적 원칙으로 이어집니다:

단일 IEC 표준이 태양광 발전소 전체에 대한 모든 보호 요구 사항을 정의할 것으로 기대해서는 안 됩니다.

IEC 62548은 주로 태양광(PV) 어레이 설계 계층을 다룹니다.

다른 표준들은 특정 장비나 설치 기능에 대한 더 상세한 요구사항을 제공합니다.

4. 최대 태양광(PV) 어레이 전압

최대 태양광(PV) 전압은 가장 먼저 설정해야 할 설계 매개변수 중 하나입니다.

MPPT 전압만을 기준으로 설계하지 마십시오.

인버터의 일반적인 MPPT 작동 전압은 태양광(PV) 어레이가 생성할 수 있는 최대 전압과 다릅니다.

최대 설계 전압은 다음을 포함한 여러 요인에 따라 달라집니다:

• 모듈 개방 전압
• 직렬 모듈 수
• 모듈 온도 계수
• Minimum expected temperature

Cold weather is particularly important.

As module temperature decreases, open-circuit voltage generally increases.

A string that appears acceptable under standard test conditions may exceed a device voltage limit under cold operating conditions.

Check the Complete DC Circuit

The maximum voltage assessment affects:

• 태양광 모듈
• 커넥터
• DC cables
• gPV 퓨즈
• 퓨즈 홀더
• SPD
• DC 아이솔레이터(절연기)
• 회로 차단기(MCB/MCCB)
• 컴바이너 박스
• 인버터 입력

A system described as “1500V DC” is not automatically suitable for 1500V operation simply because the inverter or SPD carries a 1500V rating.

Every relevant component in the DC path must be suitable for the calculated conditions.

The complete electrical path must be reviewed, not only the main equipment.

5. PV Strings and Parallel Array Design

Series-connected modules primarily influence voltage.

Parallel-connected strings significantly affect current and fault conditions.

Normal String Current Is Not Enough

The engineer should review module data including:

• Maximum power current
• Short-circuit current
• 최대 시스템 전압
• Manufacturer protection limitations

However, normal operating current does not fully describe the fault condition.

Reverse Current from Parallel Strings

Consider one PV string operating independently.

Its available current is limited by the electrical characteristics of that string.

Now consider multiple strings connected in parallel.

If one string develops a fault, healthy strings may contribute reverse current toward the damaged circuit.

The designer should assess whether this current could exceed the safe limits of:

• 태양광 모듈
• 스트링 케이블
• 커넥터
• Other connected components

This analysis directly affects the need for string overcurrent protection.

More parallel strings do not simply mean that a larger fuse should be installed.

The fault architecture must be evaluated.

6. Overcurrent Protection and gPV Fuses

Overcurrent protection is one of the most important areas of PV array design.

What Is a gPV Fuse?

A gPV fuse is designed for photovoltaic DC circuit protection.

PV fuse-links for string and array protection are specifically addressed by IEC 60269-6.

PV circuits can involve:

• High DC voltage
• 연속 작동 전류
• 병렬 스트링의 역전류
• High enclosure temperatures
• Outdoor thermal cycling

These operating conditions differ from many conventional AC applications.

Understanding the difference between a gPV fuse and a standard fuse is important because ordinary AC fuses should not automatically be used as substitutes in PV DC circuits.

Does Every PV String Need a Fuse?

아니요.

The need for string protection depends on factors such as:

• 병렬 스트링 수
• 잠재적 역전류
• Module limitations
• 케이블 허용 전류
• Equipment withstand capability

The correct process is:

Analyze the fault condition first. Select the protective device second.

Key gPV Fuse Selection Parameters

A gPV fuse review should include:

Rated DC Voltage

The fuse and fuse holder must be suitable for the maximum relevant DC voltage.

정격 전류

The fuse should carry normal PV operating current without nuisance operation while still protecting the circuit during abnormal overcurrent.

Module Limitations

The module manufacturer’s protection limits should be checked.

차단 용량

The device must be capable of interrupting the applicable fault current.

Installation Temperature

Fuse behavior can be influenced by actual enclosure temperature.

A combiner box in direct sunlight may operate at a much higher internal temperature than the outdoor ambient temperature.

보호 조정

A fuse should not be selected independently from the protected circuit.

The protection relationship can be simplified as:

PV Source → Cable → Equipment Limit → Protective Device

The protective device should operate before an unacceptable current condition causes serious damage to the protected circuit.

This is why fuse selection is an engineering coordination problem rather than a simple current-rating comparison.

For common 1000V PV string applications, engineers can also review KUANGYA’s 10×38 gPV fuse link for solar systems.

7. PV DC Cable Design

PV cable design is directly related to protection.

A fuse or breaker cannot correct fundamentally incorrect conductor selection.

Current-Carrying Capacity

Cable sizing should consider:

• Design current
• 주변 온도
• Cable grouping
• 설치 방식
• 외함 온도
• Solar exposure

The design should reflect realistic installation conditions.

전압 등급

Cable insulation must be suitable for the maximum PV circuit voltage.

This becomes increasingly important in 1500V DC systems.

Cable Routing

PV cable routing should consider:

• Mechanical protection
• Sharp edges
• UV exposure
• Water accumulation
• Connector strain
• Maintenance access

Positive and negative conductors should also be routed in a way that avoids unnecessarily large loop areas.

Cable management is not only an installation-quality issue.

It influences long-term electrical reliability.

Connector Compatibility

PV connectors are a common failure point.

Physically mating connectors should not automatically be assumed to be electrically compatible.

Differences in:

• Contact materials
• Contact geometry
• Mechanical tolerances

may increase contact resistance.

This can lead to:

• Local heating
• 절연 손상
• Arcing
• Long-term failure

Connector selection and installation should therefore form part of the PV electrical design review.

8. Switching and DC Isolation

Safe isolation is a major requirement in PV array design.

Purpose of a DC Isolator

A DC isolator provides a means of separating part of the PV DC circuit.

It may support:

• 유지 관리
• Inspection
• Inverter replacement
• Combiner box servicing
• Emergency procedures

The device must be suitable for the actual PV DC application.

A DC Isolator Is Not Automatically a Circuit Breaker

The two devices perform different functions.

A DC isolator primarily provides an isolation function.

An overcurrent protection device responds to abnormal current conditions.

A circuit breaker may provide switching and protective functions according to its design.

Engineers should select the device according to the required function rather than using the terms interchangeably.

Verify DC Switching Capability

PV DC switching is technically demanding because DC current does not have the natural periodic zero crossing found in AC systems.

The designer should verify:

• DC voltage rating
• Current rating
• Pole configuration
• Wiring arrangement
• Switching duty
• 환경 적합성

Some multi-pole DC devices require a specific connection arrangement to achieve their intended rating.

Requirements for switches, disconnectors and switch-disconnectors are addressed by IEC 60947-3.

Incorrect wiring may reduce interruption capability.

Isolation Must Be Practical

A disconnect shown on a single-line diagram may still be poorly positioned in the actual installation.

Engineers should ask:

• Is the isolator safely accessible?
• Is the isolated circuit clearly identified?
• Can maintenance personnel control reconnection?
• Does the arrangement support real maintenance work?

These factors should be evaluated together during DC 스위치-단로기 선정, rather than checking voltage and current labels independently.

Safe isolation is both an electrical and operational design issue.

9. Earthing and Bonding

PV arrays may include extensive conductive structures such as:

• Module frames
• Mounting rails
• Electrical enclosures
• Cable management systems

The earthing and bonding strategy should be coordinated with:

• Electrical installation design
• Inverter requirements
• Lightning protection
• Applicable local regulations

Where protective bonding is required, the continuity of the bonding path should be maintained throughout the life of the installation.

Potential long-term problems include:

• 느슨한 연결
• 부식
• Dissimilar metals
• 기계적 손상

Earthing Does Not Replace Surge Protection

A good earthing arrangement does not eliminate the need for correctly selected SPDs.

Similarly, an SPD does not correct a poor bonding system.

These functions interact but are not interchangeable.

10. Surge Protection and IEC 61643

PV arrays often include long outdoor conductors.

These conductors can be exposed to transient overvoltages caused by:

• Nearby lightning
• Direct lightning effects
• Electromagnetic coupling
• Switching events

IEC 62548 should be used together with more specific SPD standards where detailed surge protection design is required.

The IEC 61643 series includes:

• IEC 61643-31 for SPDs used on the DC side of PV installations
• IEC 61643-32 for PV SPD selection, installation and coordination

For a wider explanation of the standard family, SPD classifications and selection parameters, read our complete IEC 61643 surge protective device guide.

Key PV SPD Parameters

Important selection parameters may include:

• 최대 연속 동작 전압
• Voltage protection level
• 공칭 방전 전류
• Maximum discharge capability
• SPD type
• PV system topology

Selecting a product simply because it is described as a “solar SPD” is not sufficient.

Installation Location Matters

SPD performance depends partly on installation.

Long connection conductors can add additional voltage during a fast transient event.

Connection paths should therefore be kept appropriately short and direct.

Long cable distances between the PV array, combiner equipment and inverter may also require protection at more than one location.

Surge protection should be evaluated across the complete electrical path.

For 600V to 1500V photovoltaic applications, KUANGYA provides a Type 2 PV surge protective device for combiner boxes, inverter DC inputs and PV distribution cabinets.

11. PV Combiner Box Design

그리고 PV 컴바이너 박스 is a major coordination point in multi-string systems.

It may include:

• gPV 퓨즈
• 퓨즈 홀더
• DC SPD
• DC switching devices
• Busbars
• 터미널
• 모니터링 장비

The combiner box should reflect the overall PV array protection strategy.

String Input Design

검토:

• Number of incoming strings
• 스트링 전류
• Reverse-current conditions
• Fuse requirements
• Cable entry
• Polarity identification

Output Circuit

The combined output may carry significantly more current than one individual string.

The designer should verify:

• Busbar rating
• Output cable rating
• Terminal rating
• Switching-device rating

Internal Temperature

Heat can be produced by:

• 퓨즈
• 퓨즈 홀더
• 터미널
• Busbars
• Switching devices

Solar radiation can further increase enclosure temperature.

Component ratings and derating should reflect the actual internal operating environment.

IP Rating Is Not Enough

A high ingress-protection rating is important, but it does not prove that a combiner box has been correctly designed.

Electrical safety also depends on:

• Internal spacing
• 열 관리
• Component coordination
• 케이블 라우팅
• Connection quality

The complete assembly should be evaluated.

12. Inverter Coordination

효과적인 solar inverter protection requires the PV array voltage, current and external protection architecture to coordinate with the inverter or other power conversion equipment.

Important inverter parameters may include:

• Maximum DC input voltage
• MPPT voltage range
• Maximum input current
• 최대 단락 전류
• Number of MPPT channels
• Number of inputs
• Internal DC protection

Do Not Confuse MPPT Voltage with Maximum Input Voltage

The MPPT range describes the inverter’s normal operating range.

It is not the same as the maximum permissible DC input voltage.

Cold-weather open-circuit voltage must be checked separately.

Check Current Limits

Modern PV modules may have relatively high operating and short-circuit currents.

A string arrangement can be acceptable from a voltage perspective while exceeding the inverter’s current limitations.

Both voltage and current must be reviewed.

Verify Internal Protection

Some inverters include:

• DC SPD
• DC 스위치
• Fuse functions
• Insulation monitoring

These functions should be checked against actual manufacturer documentation.

Do not assume every inverter provides the same internal protection architecture.

13. Inspection and Documentation

Documentation, commissioning tests and inspection for grid-connected PV systems are addressed more specifically by IEC 62446-1.

Correct design does not eliminate installation errors.

Documentation, commissioning and inspection are therefore essential.

Important system documentation may include:

• Single-line diagrams
• String configuration
• Module data
• Inverter data
• Protection-device ratings
• Cable information
• Isolation points
• Earthing arrangements

Documentation should match the installed system.

Commissioning Inspection

Inspection should look for:

• 잘못된 극성
• 느슨한 연결
• 손상된 케이블
• Incorrect protection ratings
• Incorrect switch wiring
• Poor cable support
• Water-entry risks

The objective is to verify both electrical design and installation quality.

Developing Failures

Many PV electrical failures develop gradually.

예를 들면 다음과 같습니다:

• Increasing connection resistance
• Terminal heating
• Connector deterioration
• SPD end-of-life
• 물 유입
• 부식

Preventive, corrective and performance-related maintenance practices are addressed by IEC 62446-2.

Periodic inspection can help identify problems before they become major failures.

14. Common IEC 62548 Design Mistakes

Mistake 1: Referring to IEC 62548 Without Checking the Edition

The project should identify the applicable publication and edition.

Mistake 2: Calculating Voltage Only from Normal Operating Conditions

Cold-weather open-circuit voltage must be evaluated.

Mistake 3: Assuming Every String Needs the Same Fuse Arrangement

String protection should reflect the actual fault architecture.

Mistake 4: Selecting a Fuse Only by Current Rating

Voltage, module limitations and installation conditions also matter.

Mistake 5: Using an AC Switch in a PV DC Circuit

The device must be suitable for the actual DC switching duty.

Mistake 6: Selecting Every Component Only by the Label “1500V”

Voltage rating alone does not define complete suitability.

Mistake 7: Ignoring Long Cable Routes

Cable length affects voltage drop, surge exposure and mechanical design.

Mistake 8: Assuming the Inverter Provides All Protection

Internal protection must be reviewed against the external array design.

Mistake 9: Choosing a Combiner Box Only by String Count

Current rating, thermal design and protection coordination also matter.

Mistake 10: Treating Compliance as a Product Certificate Exercise

Individually compliant components do not automatically create a correctly coordinated PV array.

15. Practical IEC 62548 Design Workflow

A practical PV array design workflow can be organized into eight steps.

Step 1: Collect Module Data

Record:

• Voc
• Isc
• Vmp
• Imp
• Temperature coefficients
• 최대 시스템 전압
• Relevant fuse limitations

Step 2: Define the Array Architecture

Determine:

• Modules per string
• 병렬 스트링 수
• MPPT allocation

Step 3: Calculate Maximum Voltage

Consider project temperature conditions and module characteristics.

Check all relevant DC equipment.

Step 4: Evaluate Current and Fault Conditions

검토:

• 스트링 전류
• Short-circuit current
• Parallel current contribution
• Inverter current limits

Step 5: Define Overcurrent Protection

Assess whether string protection is required.

Select appropriately rated gPV fuses or other protective devices.

Step 6: Design Cabling and Isolation

검토:

• Cable rating
• Current capacity
• Routing
• 전압 강하
• DC isolation points

Step 7: Assess Surge and Combiner Protection

Coordinate:

• PV SPDs
• 컴바이너 박스 디자인
• Fuse protection
• Switching devices

정답 DC fuse and DC SPD coordination is essential because overcurrent protection and transient overvoltage protection address different fault conditions.

Step 8: Verify the Complete DC Path

검토:

PV Module → String → Cable → Protection → Combiner → Isolation → Inverter

No component should be evaluated independently from the surrounding circuit.

16. IEC 62548 Engineering Checklist

PV Modules and Strings

• Module electrical data reviewed
• Modules per string confirmed
• Parallel string quantity confirmed
• Temperature coefficients checked
• Module protection limitations reviewed

Voltage Design

• Maximum open-circuit voltage calculated
• Minimum temperature considered
• Inverter maximum DC voltage verified
• All DC equipment voltage ratings checked

Current and Overcurrent Protection

• String current reviewed
• Short-circuit current reviewed
• Reverse current evaluated
• String fuse requirement assessed
• gPV fuse coordinated with the protected circuit

DC Cabling

• Cable voltage rating suitable
• Current capacity checked
• Installation temperature considered
• Cable routing reviewed
• Mechanical support reviewed

Switching and Isolation

• Isolation points identified
• DC voltage rating confirmed
• Current rating confirmed
• Pole configuration verified
• Device location supports maintenance

서지 보호

• Surge risk assessed
• PV SPD type reviewed
• SPD voltage characteristics coordinated
• Installation location checked
• Connection path reviewed

컴바이너 박스

• String input quantity correct
• Fuse ratings coordinated
• SPD suitable for the system
• Output current verified
• Thermal design considered
• Environmental protection suitable

인버터 조정

• Maximum DC voltage checked
• MPPT range checked
• Input current checked
• Short-circuit input limits checked
• Internal protection functions verified

17. Frequently Asked Questions

What is IEC 62548?

IEC 62548 is commonly used to refer to the international design requirements for photovoltaic arrays.

The current core publication is IEC 62548-1.

What is the current version of IEC 62548?

The current core edition is IEC 62548-1:2023, with Amendment 1 published in 2025.

The applicable edition and national adoption should be verified for each project.

Does IEC 62548 cover battery energy storage?

The main scope focuses on PV array design.

Battery energy storage requires additional standards and system-specific protection assessment.

Does every PV string need a fuse?

아니요.

The need for string overcurrent protection depends on parallel-string configuration, reverse current and the electrical limits of the circuit.

What is the difference between IEC 62548 and IEC 60364-7-712?

IEC 62548-1 focuses on PV array design.

IEC 60364-7-712 addresses electrical installation requirements associated with PV power supply installations.

They are related but not interchangeable.

Does IEC 62548 cover surge protection?

It addresses PV electrical protection at the array design level.

Detailed PV SPD requirements and selection principles are addressed more specifically by IEC 61643-31 and IEC 61643-32.

Can an AC isolator be used in a PV DC circuit?

Only if the device is specifically suitable and rated for the actual DC voltage, current and switching duty.

An AC rating alone does not demonstrate suitability for PV DC use.

Is IEC 62548 only for 1500V systems?

아니요.

Its design principles apply to PV array design more broadly.

However, 1500V systems require particularly careful review of voltage ratings, insulation and DC switching.

Is a compliant fuse enough to make a combiner box compliant?

아니요.

The complete assembly must be reviewed for:

• Component ratings
• Thermal conditions
• 내부 배선
• Environmental protection
• 보호 조정

18. Final Engineering Recommendations

IEC 62548 should not be treated as a list of protection devices that must be installed in every photovoltaic system.

Its real engineering value is in system-level design.

Start with the PV module.

Define the string configuration.

Calculate the maximum voltage.

Evaluate current and reverse-current conditions.

Then coordinate:

• DC cables
• gPV 퓨즈
• 서지 보호 장치
• DC 아이솔레이터(절연기)
• 컴바이너 박스
• 인버터 입력

Every protection device should address a specific electrical risk.

A gPV fuse should be selected because an overcurrent condition has been identified.

An SPD should be selected because surge risk has been evaluated.

A DC isolator should provide a clearly defined isolation function.

A combiner box should integrate multiple circuits without creating thermal or coordination problems.

The central engineering lesson is:

PV array safety depends on coordinated electrical design, not on selecting protective devices independently.

For modern photovoltaic systems, the complete DC path should always be reviewed:

PV Module → PV String → DC Cable → Overcurrent Protection → Combiner Box → Surge Protection → Isolation → Inverter

That is the practical purpose of IEC 62548.