7Pow-R-Line X Retrot PanelboardsPow-R-Line X RetRofit PaneLboaRds MN014011EN January 2020 eatoncanada.caMaintenanceIt is essential to maintain the equipment in satisfactorycondition.To ensure continued quality service, a systematicmaintenance schedule is vital. Facility operation and localconditions vary to such an extent that the schedule mustbe prepared to suit the conditions. The maintenanceschedule for individual devices, such as circuit breakers,meters, fusible switches, etc., should be based uponrecommendations contained in the individual instructionleaflet for each device. Inspection and test operationsshould be coordinated with an overall testing programto result in the least operating inconvenience andsystem shutdowns.Prior to performing any maintenance on thepanelboard, first de-energize the panelboard at thesource. Use lockout/ tag-out precautions as prescribedin OSHA, NFPA 70E and other safety manuals.Thepanelboard should be given a thorough maintenancecheck annually.Exercise extreme care to prevent the equipment frombeing connected to the power source while tests arebeing conducted.WARNINGHAZARDOUS VOLTAGE. WILL CAUSE SEVERE INJURY ORDEATH.WARNINGONLY THOSE PROFESSIONALS TRAINED ANDQUALIFIED ON ELECTRICAL DISTRIBUTION PANELBOARDSSHOULD INSTALL AND/OR SERVICE THIS EQUIPMENT.DANGERHAZARDOUS VOLTAGE WILL CAUSE SEVERE INJURY ORDEATH. DE-ENERGIZE PANELBOARD PRIOR TO SERVICING.WARNINGONLY THOSE PROFESSIONALS TRAINED AND QUALIFIEDON ELECTRICAL DISTRIBUTION PANELBOARDS SHOULDINSTALL AND/OR SERVICE THIS EQUIPMENT.Panelboard Insulation Resistance TestingMaintenance before CleaningPrior to cleaning, perform an initial Megger or DC test ofthe panelboard insulation, between phases and ground.Inspect for symptoms that may indicate overheatingor weakened insulation. Record test readings. Refer toNEMA publication AB-4 “Guidelines for Inspection andPreventative Maintenance of Molded Case Circuit BreakersUsed in Commercial and Industrial Application.” Prior totesting, remove all control power fusing and connections toproducts, which will be damaged in this test. This includesall components with control wire fusing, Transient VoltageSurge Suppression, Surge Protective Devices, meteringequipment, etc.CleaningWhile the panelboard is de-energized, remove dust anddebris from bus bars, connections, supports and enclosuresurfaces. A vacuum cleaner with a nozzle will be ofassistance. Wipe clean with a lint-free cloth. Do not usesolvents to clean equipment as damage to surfaces canoccur. Should the panelboard be exposed to adverseconditions, such as, airborne contaminants, more frequentinspections and cleaning may be required.Use of compressed air to clean or blow out debrisin panelboards may imbed the contaminants withinovercurrent devices, metering equipment and othercomponents. Damage to insulation and other surfacematerials can occur. Do Not Use Compressed Air incleaning.Maintenance after CleaningAfter cleaning, perform a second Megger or DC test of thepanelboard insulation between phases and ground. Prior totesting, remove all control power fusing and connections toproducts, which will be damaged in this test. This includesall components with control wire fusing, Transient VoltageSurge Suppression, Surge Protective Devices, meteringequipment, etc.DO NOT USE AC dielectric testingTest resulting in readings at or above 1 megaohm issatisfactory.Compare these test readings with prior readings andretain with previous testing for future comparisons. Trendsof lowered insulation resistance are signs of potentialproblems.Bus and Cable Connections1. Inspect bus bar and cables for visible damage.2. Visually inspect connections for overheating anddamage.3. All bus bars and cable connections should bechecked and torque in accordance with labeling onthe panelboard. Refer to Appendix Table 4 for torquevalues.4. Inspect for broken wire strands and pinched ordamaged insulation on cable connections.InsulationAll bus bar and structure insulation in the panelboardincluding bus supports, bus shields, bus bracing, insulatingbarriers, etc., should be visually checked for damage.Replace damaged parts. The life of insulation material isdependent on keeping the material dry and clean.