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Electrical safety


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Electrical safety

  1. 1. You will learn about…You will learn about… – Hazards of ElectricityHazards of Electricity – Isolating CircuitsIsolating Circuits – Testing CircuitsTesting Circuits – Work on Energized EquipmentWork on Energized Equipment – Portable Electrical ToolsPortable Electrical Tools – Electrical PPEElectrical PPE – Work Area SafetyWork Area Safety – Electrical SystemsElectrical Systems
  2. 2. Electrical SafetyElectrical Safety ♦ Special Training is requiredSpecial Training is required for work on electricalfor work on electrical equipmentequipment ♦ Only Authorized EmployeesOnly Authorized Employees may conduct electrical workmay conduct electrical work
  3. 3. Special TrainingSpecial Training ♦ Training for Authorized EmployeesTraining for Authorized Employees covers:covers: – Safe Work PracticesSafe Work Practices – Isolation of Electrical SourcesIsolation of Electrical Sources – Test EquipmentTest Equipment – Tools & PPETools & PPE
  4. 4. HazardsHazards ♦ Electrical Hazards IncludeElectrical Hazards Include – Electrical ShockElectrical Shock – Electrical ExplosionsElectrical Explosions – Electrical BurnsElectrical Burns ♦ These can result in severe injury or deathThese can result in severe injury or death
  5. 5. Safe Work PracticesSafe Work Practices ♦ Before starting work…Before starting work… – De-energize, Lock, Tag & TestDe-energize, Lock, Tag & Test all circuits of 50 volts or lessall circuits of 50 volts or less – Deenergize all Power SourcesDeenergize all Power Sources – Disconnect from all electricDisconnect from all electric energy sourcesenergy sources
  6. 6. Control DevicesControl Devices Control circuit devices such as…Control circuit devices such as… –push buttonspush buttons –selector switchesselector switches –interlocksinterlocks ……may not be used as the sole meansmay not be used as the sole means for de-energizing circuits orfor de-energizing circuits or
  7. 7. Lock & Tag…Lock & Tag… ♦ Lock & Tag all SourcesLock & Tag all Sources – Place Lock & Tag on each disconnectingPlace Lock & Tag on each disconnecting means used to de-energize circuitsmeans used to de-energize circuits – Attach Lock so as to prevent operatingAttach Lock so as to prevent operating the disconnecting meansthe disconnecting means – Place Tag with Each LockPlace Tag with Each Lock
  8. 8. If a Lock cannot be applied…If a Lock cannot be applied… ♦ A tag used without a lock must beA tag used without a lock must be supplemented by at least one additionalsupplemented by at least one additional safety measure that provides a level ofsafety measure that provides a level of safety equal to that of a equal to that of a lock. ♦ Examples:Examples: – Removal of an isolating circuit elementRemoval of an isolating circuit element such as a fusesuch as a fuse – Blocking of a controlling switchBlocking of a controlling switch – Opening of an extra disconnectingOpening of an extra disconnecting device.device.
  9. 9. Release Stored Energy…Release Stored Energy… ♦ Stored electric energy must be releasedStored electric energy must be released before starting work.before starting work. – Discharge all CapacitorsDischarge all Capacitors – Short-Circuit & Ground all highShort-Circuit & Ground all high capacitance elementscapacitance elements
  10. 10. Is it “Dead”?…Is it “Dead”?… ♦ Verify System is De-Verify System is De- energizedenergized – Operate the equipmentOperate the equipment controls to check thatcontrols to check that equipment cannot beequipment cannot be restarted.restarted. – Use test equipment to test the circuits &Use test equipment to test the circuits & electrical parts for voltage & currentelectrical parts for voltage & current
  11. 11. Check your tester…Check your tester… ♦ Check test equipment (Volt-Check test equipment (Volt- Ohlm Meter) on a known liveOhlm Meter) on a known live source of same rating to ensuresource of same rating to ensure it worksit works beforebefore andand afterafter checking the circuit on whichchecking the circuit on which you will be workingyou will be working
  12. 12. Re-energizing Equipment…Re-energizing Equipment… – Conduct tests and visual inspections toConduct tests and visual inspections to ensure all tools, electrical jumpers,ensure all tools, electrical jumpers, shorts, grounds, and other such devicesshorts, grounds, and other such devices have been removedhave been removed – Warn others to stay clear of circuits andWarn others to stay clear of circuits and – Each lock and tag must be removed byEach lock and tag must be removed by the person who applied itthe person who applied it – Visually check that all employees areVisually check that all employees are clear of the circuits and equipment.clear of the circuits and equipment.
  13. 13. Energized….Energized…. ♦ Working with Energized PartsWorking with Energized Parts Persons working on energized equipmentPersons working on energized equipment must be familiar with the proper use ofmust be familiar with the proper use of special precautionary techniques,special precautionary techniques, personal protective equipment, insulatingpersonal protective equipment, insulating and shielding materials, and insulatedand shielding materials, and insulated
  14. 14. Working on energized circuitsWorking on energized circuits ♦ When working on energized circuitsWhen working on energized circuits – Isolate the area from all trafficIsolate the area from all traffic – Post signs & barricadesPost signs & barricades – Use an attendant if necessaryUse an attendant if necessary – Use insulated tool, mats and sheetingUse insulated tool, mats and sheeting – Use electrical rubber sheeting to cover nearbyUse electrical rubber sheeting to cover nearby exposed circuitsexposed circuits
  15. 15. Conductive MaterialsConductive Materials ♦ Conductive materials andConductive materials and equipment must be handled soequipment must be handled so as to prevent them fromas to prevent them from contacting exposed energizedcontacting exposed energized conductors or circuit partsconductors or circuit parts
  16. 16. Conductive ApparelConductive Apparel ♦ Remove all conductive articles ofRemove all conductive articles of jewelry and clothing, such a watchjewelry and clothing, such a watch bands, bracelets, rings, key chains,bands, bracelets, rings, key chains, necklaces, metalized aprons, clothnecklaces, metalized aprons, cloth with conductive thread, or metalwith conductive thread, or metal headgear.headgear.
  17. 17. Portable Electric Tools & CordsPortable Electric Tools & Cords ♦ Portable equipment must be handled in aPortable equipment must be handled in a manner which will not cause damage.manner which will not cause damage. ♦ Flexible electric cords connected toFlexible electric cords connected to equipment may not be used for raising orequipment may not be used for raising or lowering the equipment.lowering the equipment. ♦ Flexible cords may not be fastened withFlexible cords may not be fastened with staples or otherwise hung in such a fashionstaples or otherwise hung in such a fashion as could damage the outer jacket oras could damage the outer jacket or insulation.insulation.
  18. 18. Visually Inspect…Visually Inspect… ♦ Portable cord and plug connectedPortable cord and plug connected equipment and flexible cord setsequipment and flexible cord sets (extension cords) shall be visually(extension cords) shall be visually inspected before use on any shift forinspected before use on any shift for external defects:external defects: – Loose partsLoose parts – Deformed or missing pinsDeformed or missing pins – Damage to outer jacket or insulationDamage to outer jacket or insulation – Evidence of possible internal damageEvidence of possible internal damage
  19. 19. Remove from Service…Remove from Service… ♦ If there is a defect or evidence ofIf there is a defect or evidence of damage to any electrical tools ordamage to any electrical tools or equipment…equipment… Immediately notify your supervisorImmediately notify your supervisor Remove the item from serviceRemove the item from service Tell your co-workersTell your co-workers
  20. 20. Water HazardWater Hazard ♦Ensure hand, cords andEnsure hand, cords and receptacles are dry whenreceptacles are dry when plugging and unpluggingplugging and unplugging power cordspower cords
  21. 21. Ladders….Ladders…. – Portable ladders must have non-Portable ladders must have non- conductive side rails if they are usedconductive side rails if they are used where a workers or the ladder couldwhere a workers or the ladder could contact exposed energized exposed energized parts. – Keep all ladder parts at least 10 feetKeep all ladder parts at least 10 feet away from overhead power linesaway from overhead power lines
  22. 22. Test Instruments..Test Instruments.. – Test instruments, equipment & testTest instruments, equipment & test leads, cables, power cords, probes, andleads, cables, power cords, probes, and connectors must be visually inspectedconnectors must be visually inspected for external defects and damage beforefor external defects and damage before the equipment is used.the equipment is used. – Remove any defective items fromRemove any defective items from serviceservice
  23. 23. Instrument Ratings…Instrument Ratings… ♦ Test instruments and equipment &Test instruments and equipment & accessories must be:accessories must be: – Rated for the circuits and equipment toRated for the circuits and equipment to which they will be connectedwhich they will be connected – Designed for the environment in whichDesigned for the environment in which they will be usedthey will be used
  24. 24. Personal Protective Equipment…Personal Protective Equipment… ♦Use electrical ratedUse electrical rated protective equipment whenprotective equipment when working in areas whereworking in areas where there is a potentialthere is a potential electricalelectrical
  25. 25. More on PPE ...More on PPE ... ♦ Use, store & maintain yourUse, store & maintain your Electrical PPE in a safe, reliableElectrical PPE in a safe, reliable conditioncondition ♦ Wear nonconductive headWear nonconductive head protectionprotection ♦ Wear protective equipment for theWear protective equipment for the eyes or face wherever there iseyes or face wherever there is danger of injury to the eyes or facedanger of injury to the eyes or face
  26. 26. PPE Inspection…PPE Inspection… ♦ Electrical PPE with any of the followingElectrical PPE with any of the following defects may not be useddefects may not be used – A hole, tear, puncture, or cutA hole, tear, puncture, or cut – Ozone cutting or ozone checking (theOzone cutting or ozone checking (the cutting action produced by ozone oncutting action produced by ozone on rubber under mechanical stress into arubber under mechanical stress into a series of interlacing cracks)series of interlacing cracks)
  27. 27. AND….AND…. – Any of the following texture changes:Any of the following texture changes: swelling, softening, hardening, or becomingswelling, softening, hardening, or becoming sticky or inelastic.sticky or inelastic. – An embedded foreign objectAn embedded foreign object – Any other defect that damages theAny other defect that damages the insulating propertiesinsulating properties Don’t use defective Electrical PPE!Don’t use defective Electrical PPE!
  28. 28. PPE TestingPPE Testing ♦ Rubber insulating line hoseRubber insulating line hose • Upon indication that insulatingUpon indication that insulating value is suspectvalue is suspect ♦ Rubber insulating coversRubber insulating covers • Upon indication that insulatingUpon indication that insulating value is suspect.value is suspect.
  29. 29. PPE TestingPPE Testing ♦ Rubber insulating blanketsRubber insulating blankets • Before first issue and every 12 monthsBefore first issue and every 12 months ♦ Rubber insulating glovesRubber insulating gloves • Before first issue and every 6 monthsBefore first issue and every 6 months ♦ Rubber insulating sleevesRubber insulating sleeves • Before first issue and every 12 monthsBefore first issue and every 12 months
  30. 30. Work Area Safety…Work Area Safety… ♦You must be able to seeYou must be able to see what you are doing whenwhat you are doing when working on energizedworking on energized equipmentequipment
  31. 31. Energized partsEnergized parts ♦ Do not work on energized electrical partsDo not work on energized electrical parts • without adequate illuminationwithout adequate illumination • if there is an obstruction thatif there is an obstruction that prevents seeing your work areaprevents seeing your work area • if you must reach blindly into areasif you must reach blindly into areas which may contain energized partswhich may contain energized parts
  32. 32. Tools & EquipmentTools & Equipment – Use insulated tools orUse insulated tools or handling equipmenthandling equipment when working nearwhen working near exposed energizedexposed energized conductors or circuitconductors or circuit
  33. 33. Tools & EquipmentTools & Equipment – Use fuse handlingUse fuse handling equipment to remove orequipment to remove or install fuses when the fuseinstall fuses when the fuse terminals are energized.terminals are energized.
  34. 34. Tools & EquipmentTools & Equipment – Ropes and handlinesRopes and handlines used near exposedused near exposed energized parts must beenergized parts must be nonconductive.nonconductive.
  35. 35. Alerting others…Alerting others… Use safety signs, safetyUse safety signs, safety symbols, or accidentsymbols, or accident prevention tags to warnprevention tags to warn others about electricalothers about electrical hazards which mayhazards which may endanger them.endanger them.
  36. 36. Alerting others…Alerting others… Use barricades to preventUse barricades to prevent or limit access to workor limit access to work areas with un-insulatedareas with un-insulated energized conductors orenergized conductors or circuit partscircuit parts
  37. 37. Alerting others…Alerting others… If signs and barricades doIf signs and barricades do not provide sufficientnot provide sufficient warning and protectionwarning and protection from electrical hazards, anfrom electrical hazards, an attendant shall be stationedattendant shall be stationed to warn and protectto warn and protect employeesemployees
  38. 38. Conductive Work Locations…Conductive Work Locations… ♦ Portable electric equipment &Portable electric equipment & flexible cords used in highlyflexible cords used in highly conductive work locations whereconductive work locations where employees are likely to contactemployees are likely to contact water or conductive liquids, mustwater or conductive liquids, must be rated for the wet environmentbe rated for the wet environment
  39. 39. Electrical Systems…Electrical Systems… ♦ InterlocksInterlocks – Only a qualified person may defeat an electricalOnly a qualified person may defeat an electrical safety interlock, and then only temporarilysafety interlock, and then only temporarily while he or she is working on the equipmentwhile he or she is working on the equipment – The interlock system must be returned to itsThe interlock system must be returned to its operable condition when work is completedoperable condition when work is completed
  40. 40. Electrical Systems…Electrical Systems… ♦After a circuit is de-energizedAfter a circuit is de-energized by a circuit protective device,by a circuit protective device, the circuit may not bethe circuit may not be manually reenergized until itmanually reenergized until it has been determined that thehas been determined that the equipment and circuit can beequipment and circuit can be safely energized.safely energized.
  41. 41. Over-Current Protection…Over-Current Protection… ♦ Overcurrent protection ofOvercurrent protection of circuits and conductorscircuits and conductors may not be modified, evenmay not be modified, even on a temporary basison a temporary basis
  42. 42. System Markings..System Markings.. ♦ Electrical equipment may not be usedElectrical equipment may not be used unless the manufacturer's name,unless the manufacturer's name, trademark, or other descriptive markingtrademark, or other descriptive marking is placed on the placed on the equipment. ♦ Other markings shall be provided givingOther markings shall be provided giving voltage, current, wattage, or othervoltage, current, wattage, or other ratings as necessary.ratings as necessary.
  43. 43. Circuit ID…Circuit ID… ♦ Identification of disconnecting means andIdentification of disconnecting means and circuitscircuits – Each disconnecting means for motors andEach disconnecting means for motors and appliances shall be legibly marked toappliances shall be legibly marked to indicate its purposeindicate its purpose – Each service, feeder, and branch circuit, atEach service, feeder, and branch circuit, at its disconnecting means or overcurrentits disconnecting means or overcurrent device, must be legibly marked to indicate itsdevice, must be legibly marked to indicate its purposepurpose
  44. 44. Its Your Job….Its Your Job….  Know the hazards of electricityKnow the hazards of electricity  Know the equipmentKnow the equipment  Use Safe Work PracticesUse Safe Work Practices  Inspect your PPE before each useInspect your PPE before each use  Don’t work on energized circuitsDon’t work on energized circuits without permissionwithout permission
  45. 45. It’s your lifeIt’s your life