Main Switchboard (MSB) · Power Distribution
Schneider Electric Marine Okken Marine 5000A 690V — Power Distribution.
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| Thermographic survey | annually, or at each continuous machinery survey window |
|---|---|
| Insulation resistance test | annually |
| ACB maintenance/overhaul | per manufacturer cycle, typically every 2-4 years or after a defined number of operations |
| Protection relay function test | annually |
| Busbar joint torque check | at major overhaul or after any fault event |
| Arc-fault vent/duct inspection | annually |
| ACB contact wear | replace once the wear indicator reaches the manufacturer's limit mark - confirm against the manufacturer's manual rather than visual pitting alone |
|---|---|
| Insulation resistance (busbars to earth) | commonly expected above roughly 1 M-ohm at 500V DC test for LV switchgear of this class - investigate below that, confirm against class/manufacturer criteria |
| Busbar joint temperature rise | flag any joint running more than about 10-15 C above adjacent busbar under equal load |
Ranges are typical for this design class. Always confirm against the manufacturer documentation for your serial number.
Main switchboards of this rating normally fall under Continuous Machinery Survey items for generating and distribution equipment. Class will expect insulation resistance records, breaker maintenance history, and evidence of protection relay testing/coordination study at each survey; document any modification to feeder allocation or breaker settings.
Estimated lifetime: Not meaningfully expressed in running hours; switchboards of this type are generally designed for around 20-25 years of service life with ongoing maintenance and periodic breaker overhaul.
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