Protection Against Electric Shock and Energy Hazards: Electrical Safety Review
Protection against electric shock and energy hazards is a key part of electrical product safety assessment. Shock risk may come from accessible live parts, insulation failure, or poor grounding. Energy hazards may come from arcs, short circuits, large capacitor discharge, overheating, or mechanical injury. The review should consider product construction, use scenario, and fault conditions.
Common Review Items
| Item | Review focus | Common risk |
|---|---|---|
| Accessible parts | Check whether user-accessible positions present hazardous voltage or hazardous energy | Openings, service interfaces, or removable parts expose unassessed risk |
| Insulation system | Review basic, supplementary, reinforced insulation, and dielectric strength tests | Material, thickness, or construction changes are not reassessed for insulation capability |
| Grounding and protective bonding | Check protective earth, connection reliability, and earth continuity | Coating, loose screws, or insufficient wire size weakens protection |
| Clearance and creepage | Review pollution degree, working voltage, material group, and structural distance | PCB layout, terminal, or metal-part distance is insufficient |
| Protective devices and warnings | Check fuse, current limiting, thermal control, warning labels, and manuals | Protective-device rating or warning wording does not match actual risk |
Report Boundaries
- The report should state sample model, input ratings, construction version, test conditions, and acceptance criteria.
- After key electrical parts, PCB, enclosure material, power module, or grounding changes, risk should be reviewed again.
- Test results apply only to the sample and construction version covered by the report.
- Customer-facing pages should avoid presenting one electrical safety test as a complete whole-product safety conclusion.
Green Ark's Recommendation
Green Ark (Shenzhen) Certification Co., Ltd. recommends building an electrical safety review table that links hazard identification, structural protection, test items, change control, and warning labels during design. This helps reduce rework after mass production and safety risks in customer use scenarios.
