Title: Low‑voltage switchgear and controlgear assemblies (LV switchboards/panels)IEC Websto... Replaces: old IEC 60439 series Voltage scope: ≤ 1 000 V AC; ≤ 1 500 V DC
Core rule: Part 1 (general rules) shall always be used together with the corresponding product‑specific part (‑2 /‑3 /‑4 /‑5 /‑6 /‑7). Part 1 alone cannot prove complianceIEC Websto....
Series Structure (Latest Editions)ABB Group
表格
| Standard | Full Title | Application |
|---|---|---|
| IEC TR 61439‑0 | Guidance to specifying assemblies | Technical report, specification guide |
| IEC 61439‑1:2020 | General rules | Common definitions, service conditions, construction, verification, marking, documentation |
| IEC 61439‑2:2020 | Power switchgear and controlgear assemblies (PSC) | Industrial main switchboards, MCC, power control panels, solar‑LV cabinets |
| IEC 61439‑3:2024 | Distribution boards for ordinary persons (DBO) | Household / commercial consumer‑operated distribution boxes |
| IEC 61439‑4 | Assemblies for construction sites (ACS) | Temporary site distribution boxes |
| IEC 61439‑5:2023 | Assemblies for public distribution networks (PENDA) | Utility public‑network LV panels, substation LV boards |
| IEC 61439‑6 | Busbar trunking systems (busways) | Busbar systems |
| IEC 61439‑7 | Assemblies for specific applications | Marinas, campsites, market squares, EV charging station assemblies |
Key Definitions & Technical Characteristics (‑1)ANSI Webst...
- Assembly: Complete combination of switchgear, control‑devices, busbars, wiring, enclosures.
- Main rated parameters:
- \(I_n\): Rated current
- \(I_{ng}\): Group rated current
- \(I_{cw}\): Rated short‑time withstand current
- \(I_{pk}\): Rated peak withstand current
- \(I_{cc}\): Rated conditional short‑circuit current
- RDF ‑ Rated Diversity Factor: Critical for temperature‑rise assessment for multi‑outgoing‑circuit panels
- Service conditions: ambient temperature, altitude, pollution degree, humidity.
Verification (13‑points design verification)
IEC 61439 abolished the old TTA / PTTA concept from IEC 60439. Instead, 13 design‑verification characteristics:
- Temperature rise
- Dielectric properties
- Short‑circuit withstand
- Protection against electric shock
- Clearances & creepage distances
- Mechanical operation
- Mechanical strength of enclosure
- Degree of protection (IP)
- Wiring / connections
- Components installation
- Internal electrical circuits
- Marking
- Electromagnetic compatibility (EMC)
✅ Verification methods: actual test, calculation, comparison with verified reference design.
Important: modification of assembly may require re‑verification.
Manufacturer Obligations
- Define assembly ratings & parameters
- Complete design‑verification evidence file
- Marking on panel: manufacturer, serial‑no, part‑number, IEC‑61439‑X reference, main ratings, IP‑code
- Supply documentation: installation, operation & maintenance manual, single‑line diagram, ratings summaryANSI Webst...
Practical Tips for Export / LV‑Panel Business
- EU market: EN IEC 61439 (CENELEC adoption of IEC text) is the harmonized standard for CE‑marking of LV assemblies.
- For solar‑project LV cabinets: normally falls under IEC 61439‑2.
- EV‑charging‑station‑related assemblies: IEC 61439‑7 + IEC 61851‑1.
- Cannot only test individual components; the whole assembly must fulfil 61439 requirements.
Short Comparison: IEC 60439 vs IEC 61439
表格
| Item | IEC 60439 | IEC 61439 |
|---|---|---|
| Compliance model | TTA / PTTA | 13‑point design verification |
| General rules | Mixed in each part | Centralised in Part‑1 |
| Reference‑design method | Limited | Formalised for verification |