The Custom 380V 660V Low-Voltage Switchgear can be configured according to the electrical system, load requirements, installation environment, and project specifications. The following parameters are typical reference values; final ratings are confirmed during engineering design.

Main Electrical Configuration

Incoming Section

• ACB or MCCB

• Current transformer

• Multifunction power meter

• Protection relay

• Surge protection device

• Voltage/current monitoring

Busbar Section

• Main horizontal busbar

• Vertical distribution busbar

• Neutral busbar

• Protective earth busbar

• Copper or aluminum conductor options

Outgoing Section

• MCCB/MCB feeders

• Motor feeders

• Capacitor compensation feeders

• Lighting and auxiliary feeders

• Transformer feeders

• Generator feeders

• Solar PV/BESS feeders

Typical Configuration

For a typical 380V/660V industrial power distribution system, the switchgear can be configured as:

Incoming ACB → Main Busbar → Bus Coupler → Outgoing MCCB/MCB Feeders → Motors / Transformers / Production Equipment

The final rated current, short-circuit withstand level, busbar size, breaker specifications and cabinet dimensions should be determined from the Single Line Diagram (SLD), load list and project short-circuit calculation, rather than from the 380V/660V system voltage alone. IEC 61439-1/-2 specifies the relevant requirements and verification framework for low-voltage assemblies.

The 380V/660V Low-Voltage Switchgear can be customized according to the project's electrical design, load requirements, installation environment, and local standards.

Electrical Configuration

The switchgear can be designed around the customer's Single Line Diagram (SLD) and load list. The manufacturer can customize the number and arrangement of incoming feeders, bus couplers, outgoing feeders, motor control units, metering sections, and auxiliary circuits.

Component Brands

Depending on the project budget and technical specification, the switchgear can accommodate internationally recognized or locally approved components, such as:

• Circuit breakers

• Contactors

• Relays

• Meters

• CTs

• Protection devices

• PLCs

• VFDs

• Communication modules

Component brands and models can be specified by the customer or selected by the manufacturer according to the project requirements.

EPC Project Customization

For EPC and overseas projects, the switchgear can be customized based on:

• Project SLD

• Load list

• Technical specifications

• Local electrical standards

• Utility requirements

• Installation conditions

• Required protection functions

• Short-circuit level

• Cable arrangement

• Site dimensions

• Delivery requirements

Recommended information for customization:
Rated Voltage + Rated Current + Frequency + Short-Circuit Level + SLD + Feeder List + IP Rating + Internal Separation + Installation Environment + Applicable Standard.

The Custom 380V 660V Low-Voltage Switchgear is professionally packed according to the cabinet dimensions, weight, transportation method, destination, and project requirements. The packing process is designed to protect the switchgear, electrical components, painted surfaces, and internal connections during long-distance international transportation.

1. Pre-Shipment Inspection

Before packing, each switchgear assembly is inspected to confirm:

• Cabinet dimensions and quantity

• Main and branch circuit configuration

• Breaker installation

• Busbar installation

• Internal wiring

• Mechanical operation

• Electrical connections

• Nameplate information

• Accessories and spare parts

• Factory test results

The packing list and shipping documents are checked against the final approved configuration before shipment.

2. Internal Protection

Sensitive components are protected before the cabinet is sealed.

Typical protection measures include:

• Protective film on painted surfaces

• Plastic or foam protection for meters and control components

• Insulation protection for exposed electrical parts

• Secured doors and movable components

• Protection of circuit breaker operating mechanisms

• Anti-moisture materials inside the cabinet

• Separation of loose accessories and spare parts

For withdrawable switchgear, drawer units and removable components can be secured separately to prevent movement during transportation.

3. Moisture Protection

For overseas sea transportation, additional moisture protection can be provided.

Typical measures include:

• Waterproof plastic film

• Desiccant

• Moisture-proof packaging

• Sealed inner protection

• Vacuum or sealed packaging when required

This is particularly important for shipments exposed to high humidity, long transit times, or tropical climates.

4. External Packaging

The standard export packing can include:

Electrical Switchgear → Protective Film → Moisture Protection → Shock-Absorbing Material → Export Wooden Case / Wooden Frame → External Marking

Heavy switchgear cabinets are reinforced to reduce the risk of movement, impact, or deformation during loading and unloading.

5. Export Wooden Case

For international shipments, suitable export-grade wooden packaging can be used according to the transportation requirements.

The wooden case can provide protection against:

• Impact

• Dust

• Moisture

• Scratches

• Loading and unloading damage

• Long-distance transportation conditions

Wooden packaging for international shipments can be prepared in accordance with applicable phytosanitary requirements, including ISPM 15 where required by the destination country.

6. Container Loading

Depending on cabinet dimensions and shipment quantity, the switchgear can be arranged for:

• 20ft container

• 40ft container

• 40HQ container

• LCL shipment

• FCL shipment

The loading arrangement is planned according to cabinet dimensions and weight to maximize container utilization while maintaining safe handling.

Heavy cabinets are positioned and secured appropriately to minimize movement during transportation.

7. Shipping Methods

We can support different international transportation methods:

Sea Freight
Suitable for large EPC projects and multiple switchgear cabinets.

Air Freight
Available for urgent shipments or small quantities.

Truck Transportation
Suitable for inland transportation from the factory to the port or designated project location.

Multimodal Transportation
Sea + truck or other combinations can be arranged according to the destination and project requirements.

8. Shipping Documents

Depending on the contract and destination country, shipping documentation can include:

• Commercial Invoice

• Packing List

• Bill of Lading

• Certificate of Origin

• Factory Test Report

• Inspection Report

• Product Datasheet

• Installation Manual

• Operation & Maintenance Manual

• Warranty Documents

• Certificate of Conformity, if required

• Other project-specific documents

9. Customer-Specified Packing

For EPC projects, the packing method can be customized according to:

• Destination country

• Transportation method

• Container requirements

• Project packaging specification

• Storage period

• Site conditions

• Climate conditions

• Lifting requirements

• Customer labeling requirements

Cabinets can also be marked with cabinet number, project number, lifting position, installation position, weight, dimensions, and handling instructions to facilitate identification and installation at the project site.

10. Project Delivery

Before shipment, the customer can receive relevant shipping information such as:

• Final packing list

• Number of packages

• Package dimensions

• Gross / net weight

• Container loading information

• Product photos

• Packing photos

• Shipping documents

For EPC projects, switchgear can be packed and labeled according to the approved cabinet layout and project installation sequence, helping the site team identify and install each cabinet more efficiently.

The Custom 380V 660V Low-Voltage Switchgear undergoes comprehensive inspection and testing before delivery to verify electrical performance, mechanical operation, wiring accuracy, and overall assembly quality. Testing is carried out according to the approved technical specifications, drawings, and applicable IEC 61439 requirements.

1. Visual and Construction Inspection

The complete switchgear assembly is inspected for:

• Cabinet dimensions and construction

• Surface finish and coating quality

• Door and panel installation

• Component arrangement

• Busbar installation

• Insulation and clearance

• Cable routing

• Terminal identification

• Nameplate information

• Warning labels and safety markings

The actual assembly is checked against the approved General Arrangement Drawing, Single Line Diagram, and wiring diagrams.

2. Mechanical Operation Test

Mechanical components are checked to ensure reliable operation.

Testing may include:

• Circuit breaker ON/OFF operation

• Drawer insertion and withdrawal

• Mechanical interlocks

• Door locking mechanism

• Breaker racking mechanism

• Operating handles

• Busbar compartment access

• Functional unit positioning

Withdrawable units are checked for correct operating positions, including service, test, and isolated positions where applicable.

3. Electrical Connection Inspection

All internal electrical connections are checked before energization.

Inspection includes:

• Main circuit wiring

• Control circuit wiring

• Terminal connections

• Breaker connections

• CT wiring

• Metering circuits

• Protection circuits

• Grounding connections

• Neutral connections

• Auxiliary circuits

Terminal numbers and cable identification are verified against the approved wiring diagrams.

4. Protective Circuit Continuity Test

The protective earthing circuit is inspected to confirm continuity between exposed conductive parts and the protective earth system.

The test helps verify that the cabinet structure, doors, panels, and other relevant conductive components are properly connected to the protective circuit.

5. Insulation Resistance Test

Insulation resistance is tested between relevant electrical circuits and between live conductors and earth.

The test helps identify:

• Insulation damage

• Wiring problems

• Contamination

• Incorrect connections

• Potential leakage paths

The test voltage and acceptance criteria are selected according to the applicable product standard and project requirements.

6. Power-Frequency Withstand Test

A dielectric withstand test can be performed to verify the insulation capability of the completed assembly.

The test helps confirm that the switchgear can withstand the specified power-frequency test voltage without:

• Insulation breakdown

• Flashover

• Electrical discharge

• Abnormal leakage

The test parameters are determined according to the applicable IEC requirements and rated insulation characteristics.

7. Functional Test

Control and protection functions are tested according to the approved electrical design.

Typical checks include:

• Breaker control

• Local/remote control

• Electrical interlocking

• Bus coupler operation

• Alarm circuits

• Indicator lights

• Metering

• Protection relay signals

• Emergency stop circuits

• ATS functions, if equipped

• PLC control, if equipped

8. Protection Device Test

Protection devices are checked to ensure correct configuration and operation.

Depending on the project, testing may cover:

• Overcurrent protection

• Short-circuit protection

• Earth-fault protection

• Overload protection

• Undervoltage protection

• Overvoltage protection

• Motor protection

• Surge protection

Protection settings are verified against the approved protection coordination requirements.

9. Metering and Monitoring Test

Where multifunction meters or monitoring systems are installed, the manufacturer can verify:

• Voltage measurement

• Current measurement

• Active power

• Reactive power

• Power factor

• Frequency

• Energy measurement

• Communication functions

• RS485 / Modbus communication

10. Busbar and Connection Inspection

The main and distribution busbars are checked for:

• Correct size and configuration

• Phase identification

• Connection tightness

• Insulation condition

• Support installation

• Phase-to-phase clearance

• Phase-to-earth clearance

Special attention is given to bolted connections and busbar joints.

11. Factory Routine Verification

For low-voltage assemblies covered by IEC 61439, routine verification is performed on each completed assembly to confirm that the manufactured switchgear complies with the specified design and construction requirements.

Typical verification areas include:

• Enclosure and mechanical construction

• Protective circuits

• Internal electrical connections

• Dielectric properties

• Wiring and functional performance

12. Test Documentation

After testing, relevant test records can be provided according to the project requirements, including:

• Factory Test Report

• Routine Verification Record

• Insulation Test Record

• Dielectric Test Record

• Functional Test Record

• Protection Setting Record

• Inspection Checklist

• Final Inspection Report

For EPC projects, test documentation can be prepared according to the customer's ITP, inspection requirements, approved drawings, and project specifications.

Manufacturer Testing Process

Incoming Component Inspection
↓
Assembly Inspection
↓
Mechanical Operation Test
↓
Wiring & Connection Inspection
↓
Protective Circuit Test
↓
Insulation Resistance Test
↓
Dielectric Withstand Test
↓
Functional & Protection Test
↓
Final Inspection
↓
Test Report & Release for Shipment

Note: Routine tests are performed on the completed assembly. Design verification and project-specific performance verification are handled according to the applicable IEC 61439-1 / IEC 61439-2 requirements and the agreed technical specification.