| Electrical System | Rated voltage and frequency | Common systems include 230/400 V at 50 Hz and 120/208 V or 277/480 V at 60 Hz. The applicable system depends on the destination country and installation. | Provide the destination voltage, frequency, earthing system, short-circuit level, number of phases, neutral arrangement, and required incoming connection before quotation. | Confirm that the design, components, labels, wiring colors, and test procedures match the destination electrical code. |
| Distribution Design | Rated current and circuit arrangement | PDU switchboards are commonly configured with incomers, busbars, outgoing protective devices, metering, surge protection, bypass circuits, or maintenance sockets according to the load schedule. | Submit a single-line diagram and load schedule showing continuous load, diversity factor, spare ways, breaker ratings, cable entries, and future expansion requirements. | Make sure the nameplate rating and shipping documents use the same voltage, current, frequency, and phase information. |
| Applicable Standard | Low-voltage assembly compliance | IEC 61439-1 and IEC 61439-2 are widely used references for low-voltage switchgear and controlgear assemblies. Local regulations may require additional national standards or approvals. | Request the applicable standard edition, design-verification evidence, routine-verification records, and the declared assembly rating. | Check whether the destination market requires certification, registration, type testing, or conformity marking in addition to IEC-based documentation. |
| Protective Devices | Breaker and protection selection | Circuit breakers should be selected for rated voltage, rated current, breaking capacity, trip characteristics, pole configuration, and coordination with upstream and downstream devices. | Review the protection schedule and verify that the declared short-circuit withstand rating is suitable for the installation fault level. | Request datasheets and conformity documents for the installed protective devices without relying only on a generic component description. |
| Enclosure | Ingress protection and material | IP54 provides protection against limited dust ingress and water splashing. IP65 provides dust-tight protection and protection against water jets. The required rating depends on the installation environment. | Specify indoor or outdoor use, ambient temperature, humidity, corrosion exposure, ventilation requirements, cable-entry position, and required IP rating. | Confirm that the IP rating applies to the complete assembled enclosure, including doors, glands, ventilation openings, and unused entries. |
| Busbars and Connections | Material, temperature rise, and torque control | Copper and aluminum are common busbar materials. Current-carrying capacity depends on cross-section, enclosure arrangement, ambient conditions, joints, and temperature-rise verification. | Request busbar material and dimensions, joint-plating details, insulation clearances, connection torque values, and temperature-rise verification information. | Use corrosion-resistant packing and protect exposed connection points from moisture, salt air, and mechanical damage during transportation. |
| Metering | Measurement and communication requirements | Typical functions include voltage, current, frequency, power, energy, power factor, alarm contacts, and communication through an approved industrial protocol. | Define accuracy class, CT ratio, auxiliary supply, display language, communication interface, alarm list, data points, and cybersecurity requirements. | Confirm whether communication devices require destination-market approvals and provide an interface list for system integration. |
| Factory Inspection | Routine verification before shipment | IEC 61439 routine verification commonly covers enclosure and mechanical assembly, protective circuits, clearances and creepage distances, internal wiring, mechanical operation, dielectric properties, and functional performance. | Approve a factory acceptance test plan covering visual inspection, wiring checks, insulation or dielectric tests where applicable, functional tests, and document review. | Require dated test records, serial or project references, calibrated-instrument details, photographs, and a signed punch-list closeout. |
| Pre-Shipment Inspection | Quantity, configuration, and workmanship | Inspection should confirm enclosure dimensions, circuit labels, component quantities, cable routing, terminal identification, door operation, locks, accessories, and supplied spare parts. | Compare the finished assembly with the approved drawings, bill of materials, wiring diagrams, and purchase order before release for packing. | Photograph the nameplate, internal layout, external surfaces, packing condition, and shipping marks for customs and receiving records. |
| Documentation | Technical and quality dossier | A typical dossier may include an approved drawing, single-line diagram, wiring diagram, bill of materials, operating instructions, test report, spare-parts list, and maintenance guidance. | Specify document format, language, revision control, drawing approval process, and the required number of printed or electronic copies. | Keep product descriptions and document quantities consistent with the commercial invoice, packing list, and customs declaration. |
| Packaging | Protection against shock and moisture | Switchboards are sensitive to impact, vibration, condensation, and incorrect lifting. Export packaging commonly uses reinforced crates, moisture barriers, desiccants, and shock protection. | Request a packing specification covering lifting points, center of gravity, crate dimensions, gross weight, net weight, and maximum stacking instructions. | Confirm whether wood packaging complies with ISPM 15 requirements when solid wood is used for international shipment. |
| Shipping Terms | Incoterms and transfer of responsibility | Incoterms 2020 define responsibilities for transport, insurance, export clearance, import clearance, and risk transfer. Common options include FCA, FOB, CIF, CPT, and DAP. | State the selected Incoterm together with the named place or port, delivery schedule, insurance responsibility, and unloading responsibility. | Avoid using an Incoterm without a precise named location because cost and risk responsibilities can differ significantly. |
| Customs | Tariff classification and origin | The correct HS classification depends on the product construction, switching function, voltage rating, and customs interpretation in the importing country. | Ask the importer or customs broker to validate the HS code, preferential-origin eligibility, import permits, and any local duties before ordering. | Prepare a commercial invoice, packing list, transport document, certificate of origin when required, and any conformity or inspection certificates. |
| Commercial Terms | Quotation and payment milestones | A complete quotation should identify scope, exclusions, technical assumptions, delivery point, validity period, warranty terms, testing scope, and document deliverables. | Link payment milestones to drawing approval, production completion, inspection acceptance, and shipment-document release rather than using an unclear lump-sum scope. | Check bank charges, currency exposure, import taxes, port fees, destination handling, and inland delivery costs before comparing supplier offers. |
| Lead Time | Production and approval schedule | Delivery time varies with enclosure size, customization, component availability, drawing approval, inspection requirements, and shipping route. A fixed lead time should not be assumed before design approval. | Request a milestone schedule covering technical clarification, drawing approval, procurement, assembly, testing, packing, and dispatch. | Add time for export clearance, port congestion, customs processing, inland transport, and destination-site access restrictions. |
| Warranty and Support | After-sales service and replacement parts | Important support items include warranty duration, response time, remote troubleshooting, replacement breaker availability, wiring diagrams, and maintenance instructions. | Define the warranty start date, exclusions, spare-parts list, technical support channel, and procedure for handling non-conforming goods. | Confirm who pays for return freight, customs charges, field service, and replacement equipment when a problem occurs after delivery. |
| Final Acceptance | Site installation and commissioning | Final acceptance normally depends on correct installation, cable termination, protective-conductor continuity, insulation condition, phase sequence, functional operation, and integration with the facility system. | Use a site acceptance checklist and record test results, deviations, corrective actions, as-built drawings, and operator training. | Retain the complete technical file and customs records for future maintenance, audits, warranty claims, and regulatory inspections. |
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