| Product Expertise | Demonstrated experience with the required meter type, including single-phase, three-phase, smart, prepaid, multifunction, or current-transformer-operated meters. | Technical datasheets, circuit diagrams, sample test reports, application references, and product lifecycle records. | A manufacturer familiar with the exact application is more likely to manage accuracy, communication, enclosure, and installation requirements correctly. | 15% |
| Applicable Standards | The product specification should identify applicable parts of the IEC 62052 and IEC 62053 series. Chinese GB/T 17215 series requirements may also apply to electricity meters supplied in China. | Current certificates, laboratory reports, standard editions, and a clause-by-clause compliance matrix. | Standards define accuracy, insulation, dielectric strength, electromagnetic compatibility, environmental, and safety requirements. | 12% |
| Quality Management | An active ISO 9001 quality management certification issued for the relevant manufacturing site, supported by documented incoming, in-process, and final inspection procedures. | Certificate scope, issuing body, validity date, audit status, quality manual extracts, and sample inspection records. | A quality system provides controlled procedures for design changes, nonconforming products, traceability, corrective action, and customer complaints. | 10% |
| Production Capacity | Capacity should be stated by product model and production line, with separate figures for normal monthly output, maximum monthly output, and available capacity during the requested delivery period. | Capacity calculation, line layout, shift pattern, equipment list, recent production records, and planned loading for the next three months. | A headline annual capacity can be misleading if the required model, components, testing stations, or production slots are unavailable. | 15% |
| Testing and Calibration | Every finished meter should pass documented accuracy and safety tests. Calibration equipment should have traceability to recognized national or international measurement standards; an ISO/IEC 17025-accredited laboratory is a strong additional indicator. | Calibration certificates, equipment serial-number records, test-point procedures, uncertainty data, and sample final inspection reports. | Reliable test controls reduce measurement errors and help ensure consistent performance across production batches. | 12% |
| Accuracy and Electrical Performance | The accuracy class, reference voltage, reference frequency, basic current, maximum current, starting current, power factor range, and applicable accuracy limits must be clearly specified. | Type-test reports, accuracy curves, test conditions, meter constant data, and verification records for the requested configuration. | Electrical performance depends on the complete configuration and cannot be judged from the accuracy class alone. | 10% |
| Communication and Software | For smart meters, the communication interface, protocol, data security functions, firmware version control, time synchronization, and integration method should be defined before ordering. | Communication protocol documents, API or interface specifications, interoperability test results, cybersecurity procedures, and firmware change records. | A compliant meter may still fail operationally if its protocol, data format, or management platform cannot integrate with the buyer’s system. | 8% |
| Environmental and Safety Performance | The datasheet should define operating temperature, storage temperature, humidity, altitude, enclosure protection, insulation, surge immunity, and electromagnetic compatibility requirements. Ingress protection claims should reference IEC 60529 where applicable. | Environmental test reports, IP test reports, EMC reports, insulation test records, and installation instructions. | Meters installed outdoors, in industrial environments, or in unstable power networks require verified environmental and safety margins. | 7% |
| Supply Chain and Traceability | Critical components should have approved suppliers, incoming inspection, lot traceability, and an alternative-source plan for components with long lead times. | Approved supplier list, component specifications, incoming inspection records, batch coding method, and continuity plan. | Stable component control helps prevent changes in accuracy, communication performance, enclosure quality, and delivery reliability. | 6% |
| Lead Time and Delivery Control | The supplier should provide separate lead times for engineering samples, pilot production, first mass-production order, repeat orders, and customized configurations. | Production schedule, order milestone plan, delivery performance records, packaging specifications, and escalation procedure. | A realistic schedule exposes bottlenecks in tooling, component procurement, testing, approvals, and export documentation. | 3% |
| Export and Regulatory Readiness | For overseas projects, the manufacturer should identify the destination-market requirements. CE marking, RoHS, or EU Measuring Instruments Directive requirements may apply depending on the product and application; they should not be treated as interchangeable certificates. | Market-specific declarations, conformity assessment documents, packing lists, customs data, user manuals, and previous export documentation with confidential information removed. | Correct regulatory documentation reduces customs, installation, tender, and market-entry risks. | 4% |
| Customization and Technical Support | The supplier should define which changes are standard configuration options and which require engineering validation, tooling, software changes, or a new compliance assessment. | Engineering organization chart, change-control procedure, sample approval process, warranty terms, spare-parts policy, and service response targets. | Clear change control prevents unapproved modifications from affecting certification, interoperability, safety, or accuracy. | 3% |