CN Quality Check
Standards Comparison Tool
EXECUTIVE SUMMARY
This report compares Chinese low-voltage electrical installation standards (GB 50054-2011, GB/T 16895.1-2008) with BS 7671:2018+A2:2022. Overall equivalence is MOD (Modified) due to UK-specific amendments and later IEC adoption. Procurement implication: Chinese mandatory code GB 50054-2011 is the primary compliance basis for installations in China; BS 7671 is not directly recognised.
APPLICABLE CHINESE STANDARDS
| Standard No. | Title (Chinese) | Scope | Mandatory/Recommended | Status |
|---|---|---|---|---|
| GB 50054-2011 | 低压配电设计规范 (Code for design of low-voltage electrical installations) | Design of low-voltage electrical installations in buildings | Mandatory (GB) | Current |
| GB/T 16895.1-2008 | 低压电气装置 第1部分：基本原则、一般特性评估和定义 (Low-voltage electrical installations — Part 1: Fundamental principles) | Fundamental principles, assessment of general characteristics | Recommended (GB/T) | Current |
| GB/T 16895.23-2020 | 低压电气装置 第6部分：检验 (Low-voltage electrical installations — Part 6: Verification) | Inspection and testing of installations | Recommended (GB/T) | Current |
STANDARD TIER CLASSIFICATION
| Standard | Tier | Description |
|---|---|---|
| GB 50054-2011 | TIER 3 — Installation/Design Code | Mandatory design code for low-voltage installations |
| GB/T 16895.1-2008 | TIER 3 — Installation/Design Code | IDT with IEC 60364-1:2005; recommended adoption |
| BS 7671:2018+A2:2022 | TIER 3 — Installation/Design Code | UK national standard derived from IEC 60364 series |
| GB/T 16895.23-2020 | TIER 3 — Installation/Design Code | IDT with IEC 60364-6:2016; verification requirements |
Tier match: All are TIER 3 — valid comparison. No tier mismatch.
SCOPE BREAKDOWN
Low-voltage electrical installations — design principles
Chinese standard: GB 50054-2011: 低压配电设计规范 (Code for design of low-voltage electrical installations)
International equivalent: BS 7671:2018+A2:2022: Requirements for Electrical Installations (IET Wiring Regulations) — 18th Edition + A2:2022
Equivalence: MOD
Standard tier match: Both TIER 3 — valid comparison
| Parameter | Chinese Standard Value (Clause) | International Value (Clause) | Deviation | Mutual Recognition | Procurement Impact |
|---|---|---|---|---|---|
| Protection against electric shock — basic protection | Insulation of live parts (GB 50054-2011 §5.2.1) | Insulation of live parts (BS 7671 §411) | Identical | 直接互认 (Direct mutual recognition) | LOW |
| Protection against electric shock — fault protection | Automatic disconnection of supply (GB 50054-2011 §5.2.2) | Automatic disconnection of supply (BS 7671 §411) | Identical | 直接互认 (Direct mutual recognition) | LOW |
| Maximum earth fault loop impedance (TN system) | Zs ≤ 0.8 × U0/Ia [Verify: GB 50054-2011 ~§5.2.2] | Zs ≤ U0/Ia (BS 7671 §411.4.5) | CN applies 0.8 safety factor | 附加测试后互认 (Mutual recognition after additional testing) | HIGH |
| Arc fault detection devices (AFDDs) | Not required (GB 50054-2011) | Required for socket-outlets ≤32A in certain premises (BS 7671 §421.1.7) | CN does not mandate AFDDs | 不可互认 (Not mutually recognised) | HIGH |
| Surge protection devices (SPDs) | Required for external lightning protection systems (GB 50054-2011 §6.4) | Required for all installations with external lightning protection; expanded in A2:2022 (BS 7671 §443) | CN scope narrower | 附加测试后互认 (Mutual recognition after additional testing) | MEDIUM |
| Fire safety for EV charging | Not addressed (GB 50054-2011) | Specific requirements for EV charging equipment (BS 7671 §722) | CN has no equivalent clause | 不可互认 (Not mutually recognised) | HIGH |
KEY DIFFERENCES SUMMARY
- Earth fault loop impedance safety factor: CN applies 0.8 factor (GB 50054-2011 §5.2.2); BS 7671 uses direct calculation (§411.4.5) — 附加测试后互认 — HIGH impact.
- AFDD requirements: CN does not mandate; BS 7671 requires for socket-outlets ≤32A in certain premises (§421.1.7) — 不可互认 — HIGH impact.
- EV charging fire safety: CN has no specific clause; BS 7671 §722 provides detailed requirements — 不可互认 — HIGH impact.
- SPD scope: CN requires only for external lightning protection (GB 50054-2011 §6.4); BS 7671 §443 expanded in A2:2022 — 附加测试后互认 — MEDIUM impact.
REGULATORY LINKAGE TABLE (法规联动)
| Compliance Scenario | Chinese Regulatory Basis | International Regulatory Basis |
|---|---|---|
| Mandatory product certification | CCC (China Compulsory Certification) for electrical equipment | CE marking, UKCA |
| Engineering acceptance inspection | GB 50303-2015 (建筑电气工程施工质量验收规范) | BS 7671 Part 6 (Inspection & Testing) |
| Import/export compliance | CCIB commodity inspection | Destination country customs standard |
| Designer/engineer obligation | GB 50054-2011 (design code) | BS 7671 (Wiring Regulations) |
AUDIT FLAG RESOLUTION
- ✅ RESOLVED: GB/T 16895.1-2008 is IDT with IEC 60364-1:2005 — confirmed from official text.
- ✅ FALSE POSITIVE (domain flag): GB/T 16895.23-2020 — flagged as potential misapplication, but usage is valid because it is the Chinese adoption of IEC 60364-6:2016 for verification requirements (TIER 3).
- ⚠️ UNRESOLVED: Earth fault loop impedance formula in GB 50054-2011 — verify against official text §5.2.2 for exact safety factor.
PROCUREMENT VERDICT
- Use GB 50054-2011 as primary compliance basis for installations in China.
- BS 7671 is not directly recognised — require additional testing for AFDD, SPD, and EV charging compliance.
- Verify earth fault loop impedance safety factor (0.8) with official GB 50054-2011 text.
- For UK-bound equipment, ensure BS 7671 A2:2022 compliance (AFDDs, SPDs, EV charging).
- Engage local registered engineer (注册电气工程师) for design review.
REFERENCE DOCUMENT CHECKLIST (配套调阅清单)
- GB 50054-2011 §5.2.2 — earth fault loop impedance safety factor
- BS 7671 §411.4.5 — earth fault loop impedance calculation
- BS 7671 §421.1.7 — AFDD requirements
- BS 7671 §722 — EV charging installation requirements
FIELD INSPECTION CHECKLIST
- Verify earth fault loop impedance values against design calculations
- Check presence of AFDDs for socket-outlet circuits (if UK-bound)
- Inspect SPD installation for external lightning protection systems
- Confirm EV charging equipment compliance with BS 7671 §722 (if applicable)
- Verify RCD type and rating per BS 7671 §411 (if UK-bound)
CONFIDENCE RATING
🟡 MEDIUM — core data verified; earth fault loop impedance safety factor flagged for official text confirmation; AFDD and EV charging differences confirmed from BS 7671 A2:2022.
Technical comparison report — CN Quality Check Standards Tool. This report is NOT a substitute for official standard texts or on-site engineering verification. For physical compliance inspection in China: contact Yang Jia, Registered Supervision Engineer (注册监理工程师).
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