Commissioning should demonstrate the functions required by the project. Identify the equipment, operating modes, load conditions and acceptance criteria before testing. A generator start, an automatic transfer, a load test and a protection check answer different questions. The programme should state which are included, who is responsible and what evidence will show that the requirement has been met.
Check the interfaces as well as the set
The generator’s behaviour depends on the starting system, controls, electrical connection and supporting installation. Where transfer equipment, UPS systems or parallel sources are involved, review the relevant interfaces and sequences. A machine can run satisfactorily in isolation while an external permissive or control arrangement prevents the required system operation.
Defect management
- passed functions
- failed functions
- observations
- corrective actions
- outstanding items
Retain the mode-specific results
A commissioning record should identify the supply mode and load condition for each test. For systems involving UPS equipment or multiple sources, the relevant normal, backup and bypass arrangements require their own agreed checks.
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Make results traceable
Record the configuration, settings reference, instruments, test conditions and observations appropriate to the scope. Distinguish a completed check from a deferred test and an observed result from an assumption. Document defects and any retesting after correction. Commissioning acceptance should be based on this record and the agreed criteria, with the responsible technical review completed before release.
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Related guidance
Engineering intent
Generator Commissioning should be evaluated as part of the complete power system rather than as an isolated catalogue item. Operating duty, connected load, interfaces, protection, controls, installation conditions, testing requirements and lifecycle consequences determine whether the arrangement is appropriate.
Engineering considerations
A failed test should never automatically trigger arbitrary increase of protective limits. There is no responsible universal duration that suits every generator and every objective. A test without defined acceptance criteria can produce numbers without a decision. Acceptance criteria must come from authoritative project or equipment requirements—not be invented after the results are known. Before loading a generator, document relevant starting condition. A baseline provides context if abnormal behaviour appears during testing. 24. Do Not Begin a Load Test on a Known Unsafe Generator A machine showing serious pre-existing problems should not simply be loaded in hopes that the test will explain everything.
Selection and design considerations
The commissioning boundary should state what is included. Mechanical, electrical, fuel, exhaust, ventilation and earthing interfaces. Source failure, generator start, transfer, load restoration, operation and return-to-normal. Do not let people assume the widest boundary if only a narrow test was performed. If it is not in scope, it should not be silently implied. A system cannot be properly commissioned if installation is still undefined. It is not the same as saying the system has passed commissioning. Mechanical commissioning can include, according to project scope: Mechanical readiness is not proven by engine start alone. The foundation should support both operation and future maintenance.
Integration and protection considerations
Where modular generation and distribution infrastructure are required. Where packaged protection and defined interfaces can support deployment. Fresh air, radiator airflow, discharge and pressure drop. Verify the integrated module under intended operating conditions. Containerised-generator commissioning should verify both the generator and its packaged environment. Where contractually specified, measured under the agreed method and test conditions. Containerisation is successful when the package performs as an integrated engineered system.
Testing, commissioning and verification
Monitoring data should be checked for meaning, not merely connection. A system may report generator status without allowing remote operation. Read-only visibility and remote start/stop are different capabilities. Commissioning documentation should record relevant configuration according to project scope. A useful commissioning package can include an alarm matrix. Do not decide after the test what “pass” means. Condition noted; may require monitoring or later action. Testing cannot proceed until an issue is resolved. A vague “OK” is not a commissioning record. Punch items should be assigned, tracked and closed. Critical unresolved items should not disappear into informal conversation. Commissioning should identify whether the installed system matches the design drawings.
Operating and lifecycle considerations
Commissioning converts installation work into verified operating readiness. A generator may be installed but not commissioned. A generator may start but still not be proven. Plans and verifies the complete commissioning sequence: mechanical, electrical, controls, fuel, ventilation, exhaust, earthing, ATS/AMF, alarms, load and handover. Load-bank testing may be one part of commissioning. Did the complete agreed power path behave as intended? That includes the generator and the interfaces around it. Commissioning should be planned before site activity reaches the final stage. A commissioning plan prevents test day from becoming improvisation. “Verify the installed generator, fuel, cooling, exhaust, electrical connection, earthing, controls and transfer functions before handover.” “Verify the installed generator system against the agreed design, scope, load requirement, control sequence, protection philosophy and handover documentation.”
Direct answer
Commissioning should demonstrate the functions required by the project. Identify the equipment, operating modes, load conditions and acceptance criteria before testing.
The practical decision for Generator Commissioning should be based on verified load, equipment, interface and site information. Where equipment-specific data, regulatory applicability or a project study is required, this guidance does not replace that verification.