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Maintenance Standard GuidelineElectricalElectrical DepartmentMGUI-50006 Electrical Maintenance Best Practices Rev 2 All MCCBs equipped with manual trip buttons will be tripped using this feature. All MCCBs will be exercised several times. All MCCBs shall be maintained free of cracks in their cases and cracked or brokenoperating handles. All MCCBs which are suspect or which exhibit hotspots during NDEs will beinspected internally as well. In order to keep the Power Department (Sudbury area only) test equipment inventoryto a minimum, standardize on the following solid state trip units for 600volt MCCBs:Cutler-Hammer Digitrip RMS310 or Seltronic units.Low Voltage Power Circuit Breakers (LVCBs) LVCBs are to be serviced every three years as a minimum (cleaned, exercised,racked-in/out, contact resistance tested, meggered, etc). LVCBs which have re-occurring issues are to be removed from service and replacedby other breakers. The problematic breakers are to be sent for rebuild and notrefurbishment. If sufficient funds permit, consider replacing the defective breaker withanother type of breaker in order to minimize the different styles of breakers at thesite. When selecting other types, select a type which allows the rack in/out processto be done using a racking screw type thereby allowing more distance between theuser and the possible arc flash (permits adding an extension). All LVCBs having solid state trip units (such as the Amptector, I-Tektor, Suretrip andWestrip) are to have their first trip performed electrically using a 9volt battery(terminals OP & ON) or using an alternative method thus proving that the breakerwould have tripped before being serviced. Some older versions having highimpedance trip actuators will not allow this functional test before servicing. All LVCBs having solid state trip units are to have their units tested using secondaryinjection and the settings compared to the posted single line drawings. In order to keep the Power Department (Sudbury area only) test equipment inventoryto a minimum, standardize on the following solid state trip units for 600volt LVCBs:older units are the Westinghouse Amptector and I-Tektor while the newer units arethe Westrip and the Cutler-Hammer Digitrip units. ABB-SACE breakers found onABB-VFDs come with PRC111 trip units. All new trip units should be purchased withthe arc flash maintenance mode feature on them and with LSIG functionality. All LVCBs having dashpot protection will be replaced with breakers having solidstate trip units since dashpots can only be tested using primary injection which apartfrom having serious safety implications, is too costly and cumbersome a program toimplement. These old dashpots are likely missing oil which will cause nuisance tripsor gummed-up causing them to trip slower or not at all. Also, the lack of testing is aliability when personnel are relying on arc flash labels for the proper PPE protection. Local on-hand LVCB spares will be availablePage 6 of 16

Maintenance Standard GuidelineElectricalElectrical DepartmentMGUI-50006 Electrical Maintenance Best Practices Rev 2Medium and High Voltage Power Circuit Breakers (HVCBs)7.3. HVCBs are to be serviced every three years at a minimum for spring chargebreakers and every 5 years for magnetically operated breakers (cleaned, exercised,contact resistance testing, hi-pot of vacuum bottles, cell interlock checks, etc.). HVCBs will be first tripped using the relay protection relays thus proving theprotection circuits and the functionality. This function is performed by the PowerDepartment Technician in the Sudbury area. HVCBs having an air breaking medium are to be converted to vacuum technologyduring rebuilds. For large and heavy breakers such as the GE Magna-blast breakersor the DHP breakers, converting them to vacuum will eliminate the asbestos shieldsand the ergonomic liability. When comparing rebuild options, try obtaining 3 cycleoperating times to lower incident energy levels as well. New HVCBs purchases will be standardized across the site and possibly the divisionto minimize training requirements, assurance of spares and local expertise.HIGH VOLTAGE SWITCHGEAR RELAY TESTINGBackgroundMaintained relays assure safe operation when called to do so and at expected settings.During upset conditions, their predictable action permits the selected PPE to adequatelyprotect the worker and for proper coordination and isolation of faulted circuits.Requirementsmentioned inthe Act,regulations,codes,standards andguidelinesOSHA, 25(2)(h), “ every precaution reasonable ”, 29(1)(a)(ii), “ facilities maintainedas prescribed ”CSA-M421-11, section 4.5.5, “ before initial use and after every three years of use ”CSA-Z462-15, section 5.2.3 & 5.2.4, “ industry standards”, Annex B.2NFPA-70B-10, section 11.12, “ every 2 years ” in 11.12.1.1.2CSA Z463-13, section#8.2.9 and Table M.6OESC-12, section#2-300, “ operating electrical equipment shall be kept in a safe andproper working condition”Recommended“best practices”approachAll high voltage switchgear relays (electromechanical & digital) will be tested every threeyears to ensure their functionality and verify that settings have not been altered.Relay settings will not be altered without the necessary engineering approvals, updatingthe power system studies and posting new arc flash labels.Dated stickers will be affixed to the relay or relay cases thereby allowing the sites to knowif their relays are due for testing during electrical room audits.This service can be supplied by Vale’s Power Department (Protection and Control) in theSudbury area if the relays are located on surface. For underground relay testing, theservice must be obtained by non-Vale personnel at the current staffing levels.Page 7 of 16

Maintenance Standard GuidelineElectricalElectrical DepartmentMGUI-50006 Electrical Maintenance Best Practices Rev 2Where competing documentation exists, the area authority will either coordinate theupdating of drawings and documents or clearly indicate “obsolete” on the old documentsand drawings.A standard job template is available for this task - SAP Task List Group 34883 1YTesting,Kiruna Trly SubStn Relay, MEL (Contact: Plant Planner for more details)7.4.NGR TESTINGBackgroundTesting the power connections on NGRs which do not have monitoring resistors assuresthe site that the ground fault protection is still available.Requirementsmentioned inthe Act,regulations,codes,standards andguidelinesOSHA, 25(2)(h), “ every precaution reasonable ”, 29(1)(a)(ii), “ facilities maintainedas prescribed ”Recommended“best practices”approachEach site will have a list containing all their NGRs.CSA-M421-11, section 4.5.6 & 4.6.2(b), general information onlyCSA-Z462-15, section 5.2.3 “.in accordance with manufacturer’s instructions ”OESC-12, section#2-300, “ operating electrical equipment shall be kept in a safe andproper working condition” and section 10-1100 to 10-1108 for general informationNGRs having a resistor monitoring the primary connection will not require any yearlyservicing.NGRs not having a sensing resistor require yearly assessments of the power connections.This may or may not require an outage.Keeping in mind to standardize with Startco’s SE-330, SE-325 and SE-105, the sites willconsider adding the monitors to all NGRsThis service can be supplied by Vale’s Power Department (Protection and Control) in theSudbury area if the NGRs are located on surface. For underground NGR testing, theservice must be obtained by non-Vale personnel at the current staffing levels.Page 8 of 16

Maintenance Standard Guideline7.5.ElectricalElectrical DepartmentMGUI-50006 Electrical Maintenance Best Practices Rev 2PERSONAL AND OTHER PROTECTIVE EQUIPMENTBackgroundIt is a legal requirement to provide and maintain safety gear. Maintained gear will offer theintended protection to the worker.Requirementsmentioned inthe Act,regulations,codes,standards andguidelinesOSHA, 25(1), “provide maintain safety equipment”, 25(2)(h), “ every precautionreasonable ”Recommended“best practices”approachAll plants will follow SPI-SAF-462 when purchasing arc flash PPE for their electricalcrews.CSA-Z462-15, section 4.3.7, personal and other protective equipmentIHSA/EUSA-09, section 134 & Table 3, live line tool maintenanceTesting of Rubber Insulated Gloves (Refer to maintenance standard procedure: MPROC50002). The Power Department and those utilizing gloves for “primary protection” will testlow and high voltage gloves every 90 days and have expiry dates on their gloves tocomply with EUSA-09 Section #134 and Table 3. All other sites and departments are notto request expiry dates on their gloves and are to test them every 6 months for highvoltage and every year for low voltage.Testing of Hot Sticks (Refer to maintenance standard procedure: MPROC-50005 – HotStick Procedure). Although it is permitted to test at an interval of every 3 years, hot sticktesting will occur yearly for the Power Department and every three years for all otherdepartments. All hot sticks will have expiry dates on them. Some departments may opt toreplace them instead of testing them to be compliant.Testing of high voltage detectors (Refer to maintenance standard procedure: MPROC50009 – Modiewark Voltage Detector). It is permitted to test at an interval of every 3years, but yearly testing will occur for the Power Department. All detectors will havebattery replacement & test dates on them.Page 9 of 16

Maintenance Standard Guideline7.6.ElectricalElectrical DepartmentMGUI-50006 Electrical Maintenance Best Practices Rev 2ELECTRICAL ROOM MAINTENANCEBackgroundMaintaining electrical rooms will not only benefit the equipment, but will promote positivebehavioral changes. Achieving zero harm is not possible without it.Requirementsmentioned inthe Act,regulations,codes,standards andguidelinesOSHA, 29(1)(a)(ii), “ facilities maintained as prescribed ”CSA-M421-11, section 4.10, “ electrical equip maintained safety not compromised”CSA-Z462-15, all sectionsNFPA-70B-10, all sectionsCSA Z463-13, all sectionsOESC-12, section#2-300, “ operating electrical equipment shall be kept in a safe andproper working condition”Recommended“best practices”approachEach site will have a list containing all their substations and electrical rooms.Yearly, perform NDE on every substation and electrical room focusing mostly on the600volt distribution racks. Re-scanning the “hotspots” after repairs are made is implied.Document all actions taken.Depending on the site conditions, electrical rooms will be cleaned at appropriate intervalsto keep them locked (controlled access), cleaned and dry.Check condition of the signage and the labels.Check that the posted single lines are the latest revision in j-DMS and that they arelegible.Remove all flammable/combustible materials.Make sure all switchgear doors are closed and fastened.Verify that cable entries and other openings have been sealed with fire retardantmaterials.If any switchgear openings have been ignored, have knock-outs or other suitable barriersinstalled.Replenish the locks and tags.Verify that all relay stickers and breaker stickers are no more than three years old.Verify that the arc flash labels are no more than five years old.Depending on the seasons, either turn ON/OFF the heaters or turn ON/OFF the exhaustfans.Check for water ingress and correct immediately.Older out of service or spare switchgear that is still connected will be tagged for removalat the next outage to prevent using them out of convenience instead of adding newequipment. This will eliminate asbestos containing equipment, eliminate starters havingtwo overloads and eliminate equipment rated at only 22 kA. ( a new procedure is beingwritten to clarify this topic)Page 10 of 16

ElectricalElectrical DepartmentMGUI-50006 Electrical Maintenance Best Practices Rev 2Maintenance Standard GuidelineVale plant sites have SAP – Task Lists (standard jobs) specific to their area for conductinginspections of electrical rooms and power centers. NOTE: Refer to your plant’s Plannerto ensure you are accessing or using the most recent SAP Task List for this inspectionwork. The following are samples of task lists available at the date of this guideline.Contact your Plant Planner for more details.ooooooo7.7.Coleman Mine: SAP Task List 348861 – Inspect Electrical Switchroom, MELGarson Mine: SAP Task List 31631 3M Inspect, Switchroom, MELCreighton Mine: SAP Task List 30245 6M Inspect, Switchroom, MELTotten Mine: SAP Task List 32461 1M Inspect, Switchroom, MELCopper Cliff Mine: SAP Task List 31134 6M Inspect, Switchroom, MELClarabelle Mill: SAP Task List 37014 3M Inspect/Clean,SwitchRoom,Area30,MelSAP – Task List 34887 1Y Testing Load Centre & Area RelayOVERHEAD LINE MAINTENANCEBackgroundOverhead lines are often assumed to be the property of the Power Department’s linegangwhich is not the case. All overhead lines rated below 69/44 kV are owned and maintainedby the plant site.Requirementsmentioned inthe Act,regulations,codes,standards andguidelinesOSHA, 29(1)(a)(ii), “ facilities maintained as prescribed ”CSA-M421-11, section 4.10, “ electrical equip maintained safety not compromised”CSA-Z462-15, too many sections to listNFPA-70B-10, too many sections to listCSA Z463-13, section#8.2.24 and Table M.1OESC-12, section#2-300, “ operating electrical equipment shall be kept in a safe andproper working condition”Recommended“best practices”approachEach plant will have a schedule set-up for overhead line maintenance for all lines whichdo not belong to the utility or to the Vale Power Department.The following seasonal tasks will be performed by trained and experienced personnel:Spring chopper/foot patrol: The helicopter must fly at a speed which is slow enough for visual inspectionThe helicopter must fly at a safe distance but close enough for visual inspectionCheck for broken or burnt insulatorsCheck for defective cross armsCheck for brush & tree egressCheck for leaning poles & structuresCheck that safety signs are still affixed to the poles (ESA requirement)Check that all guy wires are still tightPage 11 of 16

Maintenance Standard GuidelineElectricalElectrical DepartmentMGUI-50006 Electrical Maintenance Best Practices Rev 2Fall foot patrol: Check all items aforementioned in the spring patrol Check that no garbage has been left around the poles Ground rod visual inspection Check for rusting & rotting on the guy wire anchors Sound the poles with a hammer at its base and as high as possible while standing Check soil condition surrounding the pole Check pole crack depths Check pole crack alignments from one side to the next7.8.POWER SYSTEM STUDIESBackgroundPower system studies contain short circuit calculations, device evaluation, coordinationand arc flash hazard risk calculations for all electrical distribution components at each siteand such are the plant’s go-to location for all major issues and upgrade inquiries.Requirementsmentioned inthe Act,regulations,codes,standards andguidelinesCSA-Z462-15, section 4.3.5.1(b), “arc flash analysis updated when a major modificationor renovation takes place. It shall be reviewed periodically, not exceeding 5 years ”Recommended“best practices”approachAll sites will have their electrical distributions modeled within a power system study whileperforming arc flash modeling. This study will follow the maintenance standard procedure:MPROC-50003 – Power System Study Procedure. In Appendix E of the study, confirm all “assumptions” before the next revision. In Appendix E of the study, correct or implement solutions to eliminate equipmentrating issues. In Appendix E of the study, correct or implement solutions to eliminate relay, fuseand/or breaker coordination issues In Appendix E of the study, correct or implement solutions to mitigate arc flashhazards permitting personnel to wear less PPE.Page 12 of 16

Maintenance Standard Guideline7.9.ElectricalElectrical DepartmentMGUI-50006 Electrical Maintenance Best Practices Rev 2HIGH VOLTAGE SWITCH MAINTENANCE (S&C)BackgroundHigh voltage switches (mostly S&C brand for Vale) are assumed to be bullet proof.Although a good product, they still require exercising and servicing depending on theirapplication.Requirementsmentioned inthe Act,regulations,codes,standards andguidelinesOSHA, 29(1)(a)(ii), “ facilities maintained as prescribed ”CSA-M421-11, section 4.10, “ electrical equip maintained safety not compromised”CSA-Z462-15, too many sections to listNFPA-70B-10, too many sections to listCSA Z463-13, too many sections to listOESC-12, section#2-300, “ operating electrical equipment shall be kept in a safe andproper working condition”General Information from various S&C Installation & Maintenance Manuals.Recommended“best practices”approach S&C is a quality robust product requiring very little maintenance over the years whenproperly installed. Mechanical maintenance is generally not required. The onlymaintenance recommended consists of periodic cleaning and inspection ofinterrupter-switch, fuse and bus supports on intervals based on environmentalconditions. The integrity of the enclosure finish should be checked and any scratchesor chips should be touched-up with the appropriate touch-up finish. Also, occasionalexercising of interrupter switches and switch operators as well as inspection of keyedinterlocks is recommended. Metal enclosed switchgear should be inspected 6 months to a year after installationthen every 5 years thereafter depending on the each user’s own experience as wellas environmental conditions. The Mini-Rupter and Alduti-Rupter switches should becleaned and re-lubricated every 10 years. It is not unusual for regular operations of interrupter switches to take place once every5 years. Fuse replacement is very infrequent since fuse operations (blowing) occur onan average of once every 20 years.For most feeder switches (switches which see less than one or two operations per monthon average over the years), operate them when servicing the low and/or high voltagebreakers approximately every three to five years. When operating them, open the doorand perform a visual to determine if cleaning and re-lubrication should be scheduled. Testthe Kirk-key as well.Page 13 of 16

Maintenance Standard GuidelineElectricalElectrical DepartmentMGUI-50006 Electrical Maintenance Best Practices Rev 2For feeder switches having higher than normal usage such as skip/cage hoists and trolleysubstations, annual inspections are required to make sure the switches are closingproperly and for re-lubricating them. The site should calculate its weekly or yearlyexpected operations and plan to replace the switches at roughly 500 operations. Leewayis available here and the calculated incident energy levels from the models and the safety& production implications due to downtime to the site should be factors to consider aswell.Page 14 of 16

ElectricalElectrical DepartmentMGUI-50006 Electrical Maintenance Best Practices Rev 2Maintenance Standard Guideline8.0APPENDICESAPPENDIX A: Revision Notes and ApprovalsPage 15

When breakers interrupt faults approaching their interrupting ratings, they shall be inspected before being re-closed. Low Voltage Power Molded-Case Circuit Breakers (MCCBs-600volt) MCCBs are to be serviced every three years. MCCBs which have re-occurring issues are t