IEC 61439 Checklist

Use the IEC 61439 Checklist to verify low-voltage switchgear and control gear assemblies meet marking, enclosure, wiring, protective circuit, and routine verification requirements before energization.

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IEC 61439 Checklist



Documentation And Marking

1. The assembly nameplate is present, legible, and fixed to the enclosure.


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2. The nameplate includes the manufacturer's name, type designation, and serial number.


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3. Rated voltage, rated current, rated frequency, and rated short-circuit withstand current (Icw) are marked on the assembly.


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4. The degree of protection (IP rating) is marked on the enclosure.


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5. The form of internal separation is marked or documented where specified.


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6. CE marking is present on the assembly where required for the EU market.


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7. The assembly is accompanied by a technical file or declaration of conformity from the original manufacturer.


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8. A circuit diagram or single-line diagram is present, matches the installed assembly, and is retained with the unit.


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9. Operation and maintenance documentation is available and handed over to the responsible party.


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Enclosure And Mechanical Condition

1. The enclosure is free from physical damage, dents, corrosion, and paint defects.


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2. All enclosure doors, covers, and panels open, close, and latch correctly.


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3. Door seals and gaskets are intact and free from damage or gaps.


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4. Cable entry points are sealed with appropriate glands or blanking plates; no open knockouts are present.


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5. The IP rating of the enclosure is maintained at all cable entry and exit points.


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6. Ventilation openings are unobstructed and correctly fitted with grilles or filters where specified.


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7. Internal separation barriers and partitions are correctly installed and undamaged where a Form 2b or higher separation is specified.


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8. All internal components are correctly mounted, aligned, and secured.


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Busbars And Internal Connections

1. Busbars are the correct size and material per the assembly design documentation.


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2. Busbar supports and insulators are correctly installed at the specified intervals and free from damage.


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3. All busbar connections and joints are correctly torqued and free from signs of overheating or corrosion.


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4. Creepage distances and clearances between live parts and between live parts and earth meet the requirements for the rated voltage.


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5. Phase identification markings on busbars are present and consistent throughout the assembly.


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6. The neutral busbar is correctly sized and installed per the assembly design.


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7. The protective earth (PE) busbar is present, correctly rated, and connected to the enclosure.


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Wiring And Cable Terminations

1. All internal wiring is the correct type, rating, and color coding per the assembly drawings and applicable standards.


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2. Wiring is correctly routed, supported, and free from damage, chafing, or sharp edges.


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3. All terminal connections are tight and correctly torqued; no loose or missing connections are present.


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4. All wire ends are correctly ferrulled and labeled at both ends to match the circuit diagram.


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5. No wire ends are left unconnected or unterminated within the assembly.


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6. Control wiring is segregated from power wiring where required by the design.


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7. Cable entries from external circuits are correctly terminated and cables are supported at the point of entry.


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Protective Circuits And Earthing

1. The protective earth (PE) busbar is connected to the enclosure and to all exposed conductive parts within the assembly.


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2. Continuity of the protective circuit is confirmed; resistance between the enclosure and each earth terminal does not exceed 0.05 ohms.


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3. All equipment earth terminals within the assembly are connected to the PE busbar.


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4. Earth connections are free from paint, corrosion, or insulating material at the contact points.


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5. The protective conductor cross-section meets the minimum requirement for the associated phase conductor size.


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Component Installation And Ratings

1. All installed components (circuit breakers, contactors, fuses, relays, meters) match the type and rating specified on the assembly schedule or circuit diagram.


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2. Components are correctly mounted in their designated positions per the assembly drawings.


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3. All circuit breakers and isolators are correctly seated and latched.


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4. Fuse ratings and types match the circuit schedule; no incorrect or mismatched fuses are installed.


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5. Overload relay settings are verified against the connected load ratings.


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6. Interlocks (mechanical and electrical) operate correctly and prevent unsafe switching combinations.


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7. All pilot lights, push buttons, and selector switches are operational and correctly labeled.


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8. Meters and measuring instruments are connected to the correct circuits and displaying readings within expected ranges.


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Routine Verification Tests

1. Insulation resistance is measured between all live conductors and earth with all circuit breakers in the ON position and sensitive devices disconnected; readings are recorded and meet the minimum required value.


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2. Dielectric withstand test (or insulation resistance as an alternative) is conducted at the specified test voltage and duration; no breakdown or flashover occurs.


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3. Continuity of protective circuits is confirmed by test for each earth path and results are recorded.


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4. Mechanical operation of all circuit breakers, isolators, and switching devices is verified; all operate smoothly without binding.


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5. All interlocks are tested and confirmed operational.


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6. Correct operation of all indicators, alarms, and control circuits is verified.


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7. All routine test results are recorded in a test report retained with the assembly documentation.


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Handover And Acceptance

1. The assembly matches the specification, purchase order, and approved drawings in all material respects.


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2. All routine test certificates from the assembly manufacturer are present and reviewed.


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3. Outstanding defects, deviations, or non-conformances are documented and agreed actions are recorded.


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4. The assembly is confirmed ready for installation and energization with no open safety-critical defects.


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5. Documentation package (circuit diagrams, test reports, operation manuals, declaration of conformity) is complete and handed over to the site or facilities team.


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Checklist by GoAudits.com – Please note that this checklist is intended as an example. We do not guarantee compliance with the laws applicable to your territory or industry. You should seek professional advice to determine how this checklist should be adapted to your workplace or jurisdiction.

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