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Presented byAnand VermaREFRESHER COURSE OISD-154ELECTRICAL SAFETYNov-14Be familiar with the basic concepts of electricity.Understand the potential effects of electricity on the human body.Be able to recognize common electrical hazards associated with daily operations and maintenance.Be familiar with electrical protective devices.Be knowledgeable of safe work practices.Course ObjectivesShock Most common and can cause electrocution or muscle contraction leading to secondary injury which includes fallsFires Enough heat or sparks can ignite combustible materialsExplosions Electrical spark can ignite vapors in the airArc Flash - can cause burns ranging from 14,000 degrees f. to 35,000 degrees fArc Blast In a short circuit event copper can expand 67,000 times. The expansion causes a pressure wave. Air also expands adding to the pressure wave

Electrical HazardsMore than 3 milliamps (ma): painful shockMore than 10 ma: muscle contractionMore than 20 ma: considered severe shock More than 30 ma: lung paralysis - usually temporaryMore than 50 ma: possible ventricular fibrillation (usually fatal)100 ma to 4 amps: certain ventricular fibrillation (fatal)Over 4 amps: heart paralysis; severe burns

DC effect on Human bodyAC effect on Human body

Working on energized circuitry or equipmentInadequate wiringExposed electrical partsWires with bad insulationUngrounded electrical systems and toolsOverloaded circuitsDamaged power tools and equipmentUsing the wrong PPE and toolsOverhead power linesDamaged extension cordsUnqualified workers doing electrical workAll hazards are made worse in wet conditions

Hazards at workplaceProper groundingUse PPEUse GFCIs/RCCBsUse fuses and circuit breakersGuard live partsLockout/ Tag-outProper use of flexible cordsMaintain minimum 10 feet from overhead linesClose electrical panels by Competent PersonEmployee trainingEnsure Competent Person on siteUse proper approved electrical equipmentQualified person install electrical devices

Preventive MeasuresEarthing SystemCircuit Breakers and RelaysFusesResidual current circuit breakerGround Fault Current InterrupterPPEInsulators

Protection SystemFor low voltage electricity >50 V AC and 110 V DCremove the source of electricity supplycommence CPR if trainedcall the emergency number on siteFor high voltage electricity >1000 Vcall the emergency number for your sitedont go near the casualtydont touch the casualty or try to free them with anythingIn hospitals , MRI, CT scan, AED may be applied.

First Aid for electric shock

Automated External DefibrillatorOISD RP 110 - Recommended Practices on Static ElectricityOISD 113 - Classification of Area for Electrical Installations at Hydrocarbon Processing & Handling FacilitiesOISD 137 - Inspection of Electrical EquipmentOISD-RP-147 -Inspection & safe practices during electrical installationsOISD-RP-148 -Inspection & safe practices during overhauling electrical equipmentOISD-RP-149- Design aspects for safety in electrical systemsOISD 173 - Fire Prevention and Protection System for Electrical InstallationsOISD-GDN-180 - Lightning Protection

Various standards

Be Safe