Dual Source Load Bank for Data Center A/B Power TestingValidate UPS failover, PDU dual feeders, STS/ATS transfer, generator feeders, and redundant A/B power paths with controlled load.
LBT Power builds dual source load bank systems for data center commissioning teams that need to test two independent power sources without using two separate load banks. Source A and Source B can be loaded, monitored, and reported from one cabinet.
Use it as a compact data center load bank for A/B feed validation, UPS redundancy testing, dual-feeder PDU commissioning, and L4/L5 integrated systems testing.
What Is a Dual Source Load Bank?
A dual source load bank is a load testing system with two independent input channels for testing redundant power paths. Instead of moving one load bank between Source A and Source B, commissioning teams can apply controlled load to both feeds from one enclosure.
For data centers, this helps simulate dual-corded IT equipment and validate UPS paths, PDU feeders, STS/ATS transfer behavior, voltage dip, source balance, and load continuity before live servers are connected.
Why Data Centers Need Dual Source Load Bank Testing
Modern data centers use dual UPS systems, A/B rack feeds, redundant PDUs, STS/ATS switching, and backup generator paths. Testing one feed at a time may prove the equipment individually, but it can miss interaction problems under real commissioning conditions.
A dual source load bank helps commissioning teams verify both paths with controlled, repeatable electrical load. That makes it easier to capture per-source measurements, compare A and B paths, and prove redundancy before the facility goes live.
Testing Source A and Source B separately can miss transfer response, load sharing, source imbalance, and thermal behavior when both paths are active.
Two standard load banks mean more transport, more cabling, more calibration records, more operators, and more floor space.
A common load may show total kW, but it does not always give clean per-source records for UPS and PDU balance verification.
Commissioning teams need voltage, current, kW, temperature, transfer timing, and alarm records that can be attached to handover reports.
A/B Power Path Testing Procedure
Confirm Source A/B Ratings
Confirm voltage, phase, frequency, target load, breaker rating, cable route, and whether the test is UPS, PDU, STS/ATS, or generator focused.
Connect Independent Channels
Connect Source A and Source B to isolated channels according to the approved method of procedure and safety boundary.
Apply Step Load
Apply planned load steps to one channel, both channels, or transfer scenarios while recording voltage, current, power, temperature, and alarms.
Verify Transfer Behavior
Run STS/ATS or UPS failover sequences and confirm load continuity, transfer timing, voltage dip, recovery behavior, and alarm response.
Export Test Records
Use per-channel data to support commissioning reports, deficiency tracking, owner witness testing, and final sign-off.
Dual Source Load Bank vs. Two Standard Units
| Parameter | Two Standard Load Banks | LBT Power Dual Source Load Bank |
|---|---|---|
| Enclosure count | 2 | 1 |
| Floor footprint | Two separate units | One compact cabinet |
| Cable runs | Separate routing per unit | Organized Source A / Source B routing |
| Control interface | Two panels or controllers | One HMI for both channels |
| Simultaneous test | More operator coordination | Single-operator coordinated test |
| Per-channel data logging | Manual data merge required | Time-aligned Source A / Source B records |
| Commissioning report | Separate files | Cleaner source comparison |
| Transport and rigging | Two shipments or rentals | One configured shipment |
Recommended Applications for Data Center Redundancy Testing
UPS Failover Testing
Verify UPS redundancy, bypass transfer, output stability, and load continuity under controlled load.
- UPS A/B path verification
- Transfer timing and recovery records
- Step-load response during commissioning
PDU Dual Feeder Commissioning
Confirm each PDU feeder can carry design load and that A/B paths remain balanced during staged testing.
- Branch circuit load checks
- Independent feeder thermal profile
- PDU meter and alarm validation
STS / ATS Transfer Testing
Simulate transfer between normal and alternate sources while tracking voltage dip, continuity, and event timing.
- Static transfer switch testing
- Automatic transfer switch testing
- Single-fault path validation
Technical Configuration Options
Each dual source load bank is configured from the project schedule, source rating, feeder arrangement, reporting requirements, and site constraints. Power, voltage, cooling method, enclosure rating, and communication protocol are confirmed before production.
Typical options are listed below. Final specifications are confirmed before quotation.
| Parameter | Range / Option |
|---|---|
| Rated power range | 21-51 kW standard range; project-specific options on request |
| Channel design | Two electrically isolated input channels with project-specific load distribution |
| Voltage range (AC) | 380 V - 690 V, 50/60 Hz |
| Voltage range (DC) | 24 V - 1,000 V |
| Cooling | Forced air or liquid-cooled configuration |
| Enclosure rating | Indoor or outdoor enclosure according to site requirement |
| Control | Local HMI with optional remote communication |
| Data logging | Per-channel voltage, current, power, temperature, and event record export |
| Documentation | FAT records, wiring drawings, user manual, and compliance documents on request |
Information Needed for a Dual Source Load Bank Quote
Electrical Inputs
- Source A and Source B voltage
- AC or DC testing requirement
- Phase and frequency
- Breaker or feeder rating
Test Scenario
- UPS failover
- A/B rack feed validation
- PDU commissioning
- STS/ATS transfer
Site and Reporting
- Indoor or outdoor use
- Required load steps
- Test duration
- Data export / FAT report need
From Enquiry to Commissioning
Requirement Discussion
Share source A/B voltage, load range, test scenario, site condition, and schedule. We confirm the configuration before quotation.
Engineering and Design
Our engineers create electrical and mechanical drawings for review before manufacturing starts.
Manufacturing and Assembly
The load bank is assembled with project-specific wiring, channel design, control logic, and enclosure configuration.
Factory Acceptance Test
FAT can document voltage, current, power, temperature, switching timing, and channel operation before shipment.
Delivery and Site Commissioning
Global shipping with protective crating. Site commissioning support is available for projects that need supervision or operator training.
Manufacturing, FAT and Delivery Support
LBT Power Manufacturing
Custom load bank engineering and factory testing before shipment.
Documentation can include drawings, FAT records, user manuals, and project-specific test records.
- Sheet-metal laser cutting and bending
- Busbar fabrication and wiring inspection
- Control logic and HMI testing
- Rated-load factory acceptance testing
- Export packaging and shipment support
Dual Source Load Bank FAQ
What is a dual source load bank used for?
It is used to test two independent power sources, such as UPS A/B paths, PDU dual feeders, STS/ATS transfer sources, or generator feeders, under controlled electrical load.
Is a dual source load bank the same as two standard load banks?
No. Two standard units can test two sources, but a dual source load bank provides a single configured cabinet, coordinated control, organized cabling, and cleaner per-source records for commissioning.
Can it be used for data center load bank testing?
Yes. It is especially useful for data center A/B power path testing, UPS failover testing, PDU commissioning, STS/ATS transfer tests, and redundancy validation.
What information is needed for a quotation?
Send Source A/B voltage, AC or DC requirement, target kW, test scenario, load steps, test duration, indoor/outdoor condition, and reporting requirements.
Can LBT Power provide FAT records?
Yes. FAT records, wiring drawings, operation manuals, and project-specific documentation can be prepared according to the confirmed configuration.
Related Data Center Load Bank Testing Resources
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View generator load bank testingContainer Load Bank
Use containerized load banks for higher-capacity data center, generator, UPS, and outdoor commissioning tests.
View container load bank optionsData Center Commissioning Checklist
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View commissioning checklistContact LBT Power
Send source A/B voltage, target load, test duration, site condition, and reporting requirements for a configuration review.
Request a dual source load bank quoteRequest a Dual Source Load Bank Configuration
Tell us your Source A/B voltage, target load, test scenario, site environment, and required report format. We will review the application and return a practical technical proposal.
