Masonry Electrical Safety Training by Rocky Mountain Masonry Institute

Focus Four Hazard TrainingFocus Four Hazard TrainingFor Masonry ConstructionFor Masonry Construction

Module 1 - Electrical SafetyModule 1 - Electrical Safety

Susan Harwood Grant Training ProgramSusan Harwood Grant Training Program

Disclaimer/Usage NotesDisclaimer/Usage NotesThis material was produced under grant number SH-17793-SH8 from the Occupational This material was produced under grant number SH-17793-SH8 from the Occupational Safety and Health Administration, U.S. Department of Labor. It does not necessarily Safety and Health Administration, U.S. Department of Labor. It does not necessarily reflect the views or policies of the U.S. Department of Labor, nor does mention of trade reflect the views or policies of the U.S. Department of Labor, nor does mention of trade names, commercial products, or organizations imply endorsement by the U.S. names, commercial products, or organizations imply endorsement by the U.S. Government. Government. Images shown may depict situations that are not in compliance with applicable OSHA Images shown may depict situations that are not in compliance with applicable OSHA requirements. These photos are clearly marked as non-compliant.requirements. These photos are clearly marked as non-compliant. It is not the intent of RMMI to provide compliance-based training in this presentation, the It is not the intent of RMMI to provide compliance-based training in this presentation, the intent is more to address Focus Four hazard awareness in the masonry construction intent is more to address Focus Four hazard awareness in the masonry construction industry, and to recognize overlapping hazards present in many construction workplaces. industry, and to recognize overlapping hazards present in many construction workplaces. It is the responsibility of the employer, its subcontractors, and its employees to comply It is the responsibility of the employer, its subcontractors, and its employees to comply with all pertinent rules and regulations in the jurisdiction in which they work. Copies of all with all pertinent rules and regulations in the jurisdiction in which they work. Copies of all OSHA regulations are available from OSHA regulations are available from www.osha.gov. This presentation is intended to . This presentation is intended to discuss Federal regulations only. If this training is held in a state that is operating under discuss Federal regulations only. If this training is held in a state that is operating under an OSHA-approved State Plan, State OSHA requirements for that state must be included an OSHA-approved State Plan, State OSHA requirements for that state must be included in the training. It is assumed that individuals using this presentation or content to in the training. It is assumed that individuals using this presentation or content to augment their training programs will be "qualified" to do so.augment their training programs will be "qualified" to do so.

Developed under an OSHA Susan Harwood Grant, #Developed under an OSHA Susan Harwood Grant, # SH-17793-SH8, by SH-17793-SH8, by the Rocky Mountain Masonry Institute, Denver, Coloradothe Rocky Mountain Masonry Institute, Denver, Colorado

http://www.osha.gov/

Training ObjectivesTraining Objectives After completing this unit, you will:After completing this unit, you will:

– Be familiar with the basic concepts of Be familiar with the basic concepts of electricity.electricity.

– Understand the potential effects of Understand the potential effects of electricity on the human body.electricity on the human body.

– Be able to recognize common electrical Be able to recognize common electrical hazards associated with masonry work.hazards associated with masonry work.

– Be familiar with electrical protective Be familiar with electrical protective devices.devices.

– Be knowledgeable of safe work Be knowledgeable of safe work practices.practices.

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ReferencesReferences 29 CFR 1926.400; Subpart K29 CFR 1926.400; Subpart K National Electric Code (NEC)National Electric Code (NEC)

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Take Electricity SeriouslyTake Electricity Seriously Electricity is the Electricity is the second leading second leading

cause of deathcause of death in construction. in construction. Electrocutions make up 12% of Electrocutions make up 12% of

construction fatalities annually.construction fatalities annually. Over 30,000 non-fatal shocks occur Over 30,000 non-fatal shocks occur

each year.each year. Over 600 deaths occur annually Over 600 deaths occur annually

due to electrocution. due to electrocution.

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Source: Bureau of Labor Statistics

Electrical AccidentsElectrical Accidents Leading Causes of Electrical Accidents:Leading Causes of Electrical Accidents:

– Drilling and cutting through cablesDrilling and cutting through cables– Using defective tools, cables and equipmentUsing defective tools, cables and equipment– Failure to maintain clearance distance of 10 feetFailure to maintain clearance distance of 10 feet– Failure to de-energize circuits and follow Lockout/Tagout Failure to de-energize circuits and follow Lockout/Tagout

proceduresprocedures– Failure to guard live parts from accidental worker contactFailure to guard live parts from accidental worker contact– Unqualified employees working with electricityUnqualified employees working with electricity– Improper installation/use of temporary electrical systems Improper installation/use of temporary electrical systems

and equipmentand equipment– By-passing electrical protective devicesBy-passing electrical protective devices– Not using GFCI (ground fault circuit interrupters) devicesNot using GFCI (ground fault circuit interrupters) devices– Missing ground prongs on extension cordsMissing ground prongs on extension cords


Hazards of Electricity Hazards of Electricity ShockShock – Most common and can cause electrocution or – Most common and can cause electrocution or

muscle contraction leading to secondary injury which muscle contraction leading to secondary injury which includes fallsincludes falls

FiresFires – Enough heat or sparks can ignite combustible – Enough heat or sparks can ignite combustible materialsmaterials

ExplosionsExplosions – Electrical spark can ignite vapors in the – Electrical spark can ignite vapors in the airair

Arc Flash Arc Flash - can cause burns ranging from 14,000 can cause burns ranging from 14,000 degrees f. to 35,000 degrees fdegrees f. to 35,000 degrees f

Arc Blast Arc Blast – In a short circuit event copper can expand In a short circuit event copper can expand 67,000 times. The expansion causes a pressure wave. 67,000 times. The expansion causes a pressure wave. Air also expands adding to the pressure waveAir also expands adding to the pressure wave


Fundamentals of ElectricityFundamentals of ElectricityLike Water In A Garden HoseLike Water In A Garden Hose

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Current = Flow RateCurrent = Flow RateExample – 15 gallons per minute Example – 15 gallons per minute

Resistance = Diameter of HoseResistance = Diameter of HoseExample – Larger hose (less resistance), Example – Larger hose (less resistance), more water flowsmore water flows

Voltage = Water PressureVoltage = Water PressureExample – 45 PSIExample – 45 PSI

Flow of WaterFlow of Water

Fundamentals of Electricity Fundamentals of Electricity Electrical Electrical currentcurrent is the flow of is the flow of

electrons through a conductor.electrons through a conductor. A A conductorconductor is a material that allows is a material that allows

electrons to flow through it.electrons to flow through it. An An insulatorinsulator resists the flow of resists the flow of

electrons.electrons. ResistanceResistance opposes electron flow. opposes electron flow.


Current Flows in a Current Flows in a Loop or CircuitLoop or Circuit

Circuits are AC Circuits are AC (alternating current) or (alternating current) or DC (direct current).DC (direct current).

Current is usually AC.Current is usually AC. AC current has five AC current has five

parts:parts:(1) Electrical source(1) Electrical source(2) HOT wire to the tool.(2) HOT wire to the tool.(3) The tool itself(3) The tool itself(4) NEUTRAL wire returns (4) NEUTRAL wire returns

electricity from the toolelectricity from the tool(5) GROUND (5) GROUND


How Shocks OccurHow Shocks Occur Current travels in closed circuits Current travels in closed circuits

through conductors (water, through conductors (water, metal, the human body).metal, the human body).

Shock occurs when the body Shock occurs when the body becomes a part of the circuit.becomes a part of the circuit.

Current enters at one point & Current enters at one point & leaves at another.leaves at another.


Shocks Occur in Shocks Occur in Three WaysThree Ways

Contact with both Contact with both conductorsconductors

Contact with one Contact with one conductor and conductor and groundground

With a tool: contact With a tool: contact with “hot” metal with “hot” metal part and ground (1), part and ground (1), (2) & (3)(2) & (3)


Severity of the ShockSeverity of the Shock Severity of the Shock depends on:Severity of the Shock depends on:

– Amount of current Amount of current • Determined by voltage and resistance to Determined by voltage and resistance to

flowflow– Path through the bodyPath through the body– Duration of flow through the bodyDuration of flow through the body– Other factors such as general health Other factors such as general health

and individual differences.and individual differences.


He sweats - and he dies...He sweats - and he dies...Luling, La. - A man was electrocuted when his Luling, La. - A man was electrocuted when his sweat dripped into the electric drill he was using sweat dripped into the electric drill he was using to build a swing set in his backyard, the coroner to build a swing set in his backyard, the coroner said.said.

Richard Miller was pronounced dead Richard Miller was pronounced dead Sunday at St. Charles Hospital, said David Vial, Sunday at St. Charles Hospital, said David Vial, St. Charles Parish coroner. Miller, 54, had been St. Charles Parish coroner. Miller, 54, had been using an electric drill in 90 degree heat, Vial said using an electric drill in 90 degree heat, Vial said Monday.Monday.

““Apparently the man was sweating Apparently the man was sweating profusely,” Vial said. “He probably was pushing profusely,” Vial said. “He probably was pushing against the drill with his chest and his against the drill with his chest and his perspiration went into the drill itself and made a perspiration went into the drill itself and made a contact.”contact.”

The Associated PressThe Associated Press


Effects of Current FlowEffects of Current Flow More than 3 milliamps (ma): More than 3 milliamps (ma): painful shockpainful shock More than 10 ma: More than 10 ma: muscle contractionmuscle contraction More than 20 ma: More than 20 ma: considered severe shock considered severe shock More than 30 ma: More than 30 ma: lung paralysis lung paralysis - usually - usually

temporarytemporary More than 50 ma: More than 50 ma: possible ventricular possible ventricular

fibrillationfibrillation (usually fatal) (usually fatal) 100 ma to 4 amps: 100 ma to 4 amps: certain ventricular fibrillation certain ventricular fibrillation

(fatal)(fatal) Over 4 amps: Over 4 amps: heart paralysis; severe burns heart paralysis; severe burns


Using a 120 volt circuit and resistance Using a 120 volt circuit and resistance for wet & dry skin:for wet & dry skin:


E=IRE=IR: Voltage=Current x Resistance: Voltage=Current x Resistance (Volts) (Amps) (Ohms)(Volts) (Amps) (Ohms)So: So: I=E/RI=E/R

Dry Skin =120/100,000=.0012 ampsDry Skin =120/100,000=.0012 amps ==1.2ma1.2ma flowing through flowing through body to groundbody to ground

Wet skin =120/1000=.120 ampsWet skin =120/1000=.120 amps ==120ma120ma flowing through flowing through body to ground body to ground

RememberRemember: : 1 Amp = 1000 milliamps1 Amp = 1000 milliamps


Effects of Current FlowEffects of Current Flow

Controlling Electrical HazardsControlling Electrical Hazards Employers must follow the OSHA Employers must follow the OSHA

Electrical Standards (Subpart K)Electrical Standards (Subpart K) Electrical installationElectrical installation Subpart K includes four proactive Subpart K includes four proactive

methods:methods:– Electrical IsolationElectrical Isolation– Equipment GroundingEquipment Grounding– Circuit InterruptionCircuit Interruption– Safe Work PracticesSafe Work Practices


Electrical Isolation Electrical Isolation We can be safe by keeping electricity We can be safe by keeping electricity

away from us. We can:away from us. We can:– InsulateInsulate the conductors.the conductors.

• Example: The insulation on extension cords.Example: The insulation on extension cords.– ElevateElevate the conductors.the conductors.

• Example: Overhead powerlines.Example: Overhead powerlines.– Guard Guard the conductors by enclosing them.the conductors by enclosing them.

• Example: Receptacle covers, boxes, & Example: Receptacle covers, boxes, & conduitconduit..


Insulating the Conductors Insulating the Conductors The first way to safeguard workers The first way to safeguard workers

from electrically energized wires is from electrically energized wires is through through insulationinsulation..

Rubber and plastic is put on wires to Rubber and plastic is put on wires to prevent shock, fires, short circuits prevent shock, fires, short circuits and for strain relief.and for strain relief.

It is always necessary to check the It is always necessary to check the insulation on equipment and cords insulation on equipment and cords before plugging them in.before plugging them in.

Remember, even the smallest defect Remember, even the smallest defect will allow leakage!will allow leakage!

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Defective Extension CordsDefective Extension Cords

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Photos depict hazardous conditionPhotos depict hazardous condition

Defective Cord IncidentDefective Cord Incident Worker attempted to Worker attempted to

climb scaffold with climb scaffold with electric drill.electric drill.

Drill’s cord was Drill’s cord was damaged with bare damaged with bare wires showing.wires showing.

The bare wire contacted The bare wire contacted the scaffolding.the scaffolding.

The worker died!The worker died!


Depicts hazardous conditionDepicts hazardous condition

Elevating the ConductorsElevating the Conductors The second way to safeguard workers The second way to safeguard workers

from electrically energized wires is by from electrically energized wires is by elevatingelevating them.them.

Wires are often elevated by the power Wires are often elevated by the power company.company.

It is always necessary to check the It is always necessary to check the location of overhead lines before you location of overhead lines before you begin work each day.begin work each day.

Remember, never allow yourself, your Remember, never allow yourself, your tools, or the materials you are working tools, or the materials you are working with to be within with to be within 10 feet10 feet of energized lines!of energized lines!


Photo depicts hazardous conditionPhoto depicts hazardous condition

Working Near Overhead LinesWorking Near Overhead Lines Clearance of worker and any Clearance of worker and any

equipment, tools, materials, or equipment, tools, materials, or scaffold near scaffold near uninsulated uninsulated lines is 10 feet!lines is 10 feet!



Overhead Line IncidentOverhead Line Incident A worker was A worker was

attempting to attempting to move mobile move mobile scaffold.scaffold.

Scaffold made Scaffold made contact with contact with 7200 volt line.7200 volt line.

The worker died.The worker died.



Guarding the ConductorsGuarding the Conductors The third way to safeguard workers from The third way to safeguard workers from

electrically energized wires is by electrically energized wires is by guardingguarding them.them.

Covers, boxes, and enclosures are often Covers, boxes, and enclosures are often put around conductors to prevent put around conductors to prevent worker contact.worker contact.

It is always necessary to check that It is always necessary to check that electrical boxes and panels are covered electrical boxes and panels are covered and free from missing “knock-outs”. and free from missing “knock-outs”.

Remember, electric equipment operating Remember, electric equipment operating at 50 volts or more must be guarded!at 50 volts or more must be guarded!




Guarding the ConductorsGuarding the Conductors



Guarding the ConductorsGuarding the Conductors


Equipment Grounding Equipment Grounding We can be safe by providing a We can be safe by providing a

separate, low resistance pathway for separate, low resistance pathway for electricity when it does not follow electricity when it does not follow normal flow (ground prong).normal flow (ground prong).

GroundingGrounding gives the stray current gives the stray current somewhere to go and keeps you from somewhere to go and keeps you from becoming part of the circuit.becoming part of the circuit.


Can You Rely on Grounding?Can You Rely on Grounding? Grounding Grounding will not workwill not work if the if the

electricity can flow through you more electricity can flow through you more easily than the ground. This can easily than the ground. This can happen when:happen when:– Your tool doesn’t have a ground pin.Your tool doesn’t have a ground pin.– You’re working in wet locations.You’re working in wet locations.– You’re touching a metal object.You’re touching a metal object.


What Must be Grounded?What Must be Grounded?

All circuits and All circuits and extension cords. extension cords.

All noncurrent carrying All noncurrent carrying metal parts.metal parts.

Portable & semi-portable Portable & semi-portable tools and equipment tools and equipment unless double insulated.unless double insulated.



Do Not Eliminate the Ground!Do Not Eliminate the Ground!

You become the next-best path for current!You become the next-best path for current!



Do Not Reverse PolarityDo Not Reverse PolarityThe prongs are different The prongs are different sized so you can’t turnsized so you can’t turnthe plug around. If youthe plug around. If youdo, the electrical fieldsdo, the electrical fieldswithin the motor are alwayswithin the motor are alwaysenergized. If there isenergized. If there ismoisture present, the case moisture present, the case is likely to be “hot”. Evenis likely to be “hot”. Evenwith double-insulated tools, with double-insulated tools, you still could get a shock. you still could get a shock.


Circuit Interruption Circuit Interruption We can be safer by automatically We can be safer by automatically

shutting off the flow of electricity in the shutting off the flow of electricity in the event of leakage, overload, or short event of leakage, overload, or short circuit. circuit.

Ground Fault Circuit Interrupters (GFCI) Ground Fault Circuit Interrupters (GFCI) are circuit protection (or “overcurrent”) are circuit protection (or “overcurrent”) devices that protect you, the worker.devices that protect you, the worker.

Circuit breakers & fuses protect Circuit breakers & fuses protect equipmentequipment, not you, because they take , not you, because they take too much current & too much time to trip.too much current & too much time to trip.

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Circuit Protective DevicesCircuit Protective Devices Circuit Breakers and FusesCircuit Breakers and Fuses

– OnlyOnly protect the building, equipment, protect the building, equipment, and toolsand tools from heat build-up!from heat build-up!

– Never depend on circuit breakers or Never depend on circuit breakers or fuses to prevent shocks!fuses to prevent shocks!

Ground Fault Circuit Interrupter Ground Fault Circuit Interrupter (GFCI)(GFCI)– Is the only device which willIs the only device which will protect the protect the

workerworker from shock and electrocution! from shock and electrocution!


GFCI ProtectionGFCI Protection All temporary circuits are required to All temporary circuits are required to

have GFCI protection have GFCI protection oror::– Equipment & cords must be included Equipment & cords must be included

in anin an Assured Equipment Grounding Assured Equipment Grounding Conductor ProgramConductor Program

An extension cord An extension cord isis a temporary circuit. a temporary circuit. Types of GFCIs: receptacle, circuit Types of GFCIs: receptacle, circuit

breaker and portable breaker and portable Must be wired correctly and tested.Must be wired correctly and tested.


How a GFCI WorksHow a GFCI WorksK

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The GFCI detectsThe GFCI detects‘‘leakage’ of 4-6leakage’ of 4-6milliamps & opensmilliamps & opensthe circuit in 1/40the circuit in 1/40thth

of a second. of a second.

It It willwill work without work withoutthe ground plugthe ground plugbut but not not fast fastenough if enough if youyou are are the ground . the ground .

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A GFCI breaker must be installed to protect A GFCI breaker must be installed to protect workers using 220V masonry saws. workers using 220V masonry saws.


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GFCI TestersGFCI Testers

Assured Equipment Grounding Assured Equipment Grounding Conductor ProgramConductor Program

Requires the following:Requires the following:

-Written program-Written program and specific proceduresand specific procedures-Program implemented by a -Program implemented by a Competent Person Competent Person ((one one

who is capable of identifying existing and predictable who is capable of identifying existing and predictable hazards in the surroundings or working conditions hazards in the surroundings or working conditions which are unsanitary, hazardous, or dangerous to which are unsanitary, hazardous, or dangerous to employees, and who has authorization to take prompt employees, and who has authorization to take prompt corrective measures to eliminate them. corrective measures to eliminate them.

-Equipment grounding conductors must be tested-Equipment grounding conductors must be tested (tools, extension cords, and circuits):(tools, extension cords, and circuits):

At least every three months for cords & toolsAt least every three months for cords & toolsAt least every six months for receptaclesAt least every six months for receptaclesResults recorded - equipment coded (colored tape) Results recorded - equipment coded (colored tape)


Checking for Ground ContinuityChecking for Ground Continuity

What else we should we notice here?What else we should we notice here?

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Temporary WiringTemporary Wiring

There must be separate circuits for There must be separate circuits for electric tools and lighting, each electric tools and lighting, each labeled as such.labeled as such.

Light circuits do not require a GFCI.Light circuits do not require a GFCI.– Unless used in a wet location.Unless used in a wet location.

Test branch circuits before use.Test branch circuits before use. Maintain vertical clearances.Maintain vertical clearances. Insulate wires from their supports.Insulate wires from their supports.

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Permanent Equipment in Temporary UsePermanent Equipment in Temporary Use

What is wrong with using this as a ‘splitter’?What is wrong with using this as a ‘splitter’?

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Extension Cords and CablesExtension Cords and Cables Must be in good shape without splices.Must be in good shape without splices. Cannot be secured with staples, nails or Cannot be secured with staples, nails or

bare wire.bare wire. Must be protected from damage.Must be protected from damage. Must have a ground pin.Must have a ground pin. Should be inspected regularly and pulled Should be inspected regularly and pulled

from service if defective.from service if defective. Cannot be repaired with electrical or duct Cannot be repaired with electrical or duct

tape. Must repair with heat-shrink sleeve or tape. Must repair with heat-shrink sleeve or bonding/vulcanizing tape to retain original bonding/vulcanizing tape to retain original insulation properties.insulation properties.



Acceptable Cord Types Acceptable Cord Types All cords must meet the National Electric Code’s All cords must meet the National Electric Code’s

(NEC) requirement for Hard/Extra Hard type.(NEC) requirement for Hard/Extra Hard type. Look for markings stamped on cords.Look for markings stamped on cords. Acceptable Cord TypesAcceptable Cord Types

– Extra Hard Use Markings: S, ST, SO, STOExtra Hard Use Markings: S, ST, SO, STO

– Hard Usage Markings: SJ, SJO, SJT, SJTOHard Usage Markings: SJ, SJO, SJT, SJTO


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Extension Cords-What’s the Difference?Extension Cords-What’s the Difference?

No flat cords allowed on construction sites!No flat cords allowed on construction sites!

Clever Or Foolish?Clever Or Foolish?K

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Temporary Lighting Temporary Lighting All bulbs must be All bulbs must be

guardedguarded No broken bulbs No broken bulbs

or empty socketsor empty sockets Not suspended Not suspended

by wiring by wiring Low voltage for Low voltage for

wet locationswet locations



Portable GeneratorsPortable Generators The frame of the The frame of the

portable generator need portable generator need not be grounded if:not be grounded if:– the generator supplies the generator supplies

only cord and plug only cord and plug connected equipment.connected equipment.

– The non-current carrying The non-current carrying metal parts of equipment metal parts of equipment and the equipment and the equipment grounding conductor grounding conductor terminals of the terminals of the receptacles are bonded receptacles are bonded to the generator frame.to the generator frame.

– GFCI is required if >5kV GFCI is required if >5kV or if generator provides or if generator provides 220V as well as 110V.220V as well as 110V.

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Safe Work PracticesSafe Work Practices Before work begins, the employer Before work begins, the employer

must determine where exposed and must determine where exposed and concealed electrical circuits are concealed electrical circuits are located.located.

Once found, warning signs/labels Once found, warning signs/labels must be posted.must be posted.

Workers need to know the location, Workers need to know the location, hazards, and protective measures.hazards, and protective measures.


Safe Work PracticesSafe Work Practices Competent Person determines if Competent Person determines if

performance of work could bring performance of work could bring contact with energy.contact with energy.– Distance of the worker to the energy Distance of the worker to the energy

source should be considered first.source should be considered first.– Tools, materials, and processes should Tools, materials, and processes should

also be considered to see if they could also be considered to see if they could potentially shorten the safe separation potentially shorten the safe separation distance.distance.

• Examples: Metal Ladders, Re-bar, Forklift, Examples: Metal Ladders, Re-bar, Forklift, Scaffold Frames, etc. Scaffold Frames, etc.


Safe Work PracticesSafe Work Practices Must not permit work near electric Must not permit work near electric

circuits unless the worker is circuits unless the worker is protected by:protected by:– De-energizing the circuit and grounding De-energizing the circuit and grounding

it.it.– Guarding it effectively by insulation.Guarding it effectively by insulation.– Other means (maintaining safe Other means (maintaining safe

separation)separation) De-energized circuits and equipment De-energized circuits and equipment

must be must be locked/tagged out.locked/tagged out.


Safe Work PracticesSafe Work Practices No metal ladders for or near No metal ladders for or near

electrical work.electrical work. No wet hands when plugging or No wet hands when plugging or

unplugging cords/equipment.unplugging cords/equipment. No raising or lowering tools by No raising or lowering tools by

the cord.the cord. Unless equipment is designed Unless equipment is designed

for it, cannot be used in damp for it, cannot be used in damp and wet locations.and wet locations.



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Common OSHA Citations:Common OSHA Citations:– ..404(b)(1)(i): Branch circuits: GFCI 404(b)(1)(i): Branch circuits: GFCI

protection/Assured Equipment Grounding protection/Assured Equipment Grounding Conductor ProgramConductor Program

– .404(f)(6): Grounding path.404(f)(6): Grounding path– .403(b)(2): Equipment installation and use.403(b)(2): Equipment installation and use– .404(b)(1)(ii): GFCI.404(b)(1)(ii): GFCI– .403(i)(2)(i): Guarding live parts.403(i)(2)(i): Guarding live parts

How can the hazards addressed by these How can the hazards addressed by these Standards best be corrected, controlled, Standards best be corrected, controlled, or eliminated?or eliminated?

Summary – Hazards & ProtectionsSummary – Hazards & ProtectionsMasonry Electrical SafetyMasonry Electrical Safety 55K

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HazardsHazards Inadequate wiringInadequate wiring Exposed electrical partsExposed electrical parts Wires with bad insulationWires with bad insulation Ungrounded electrical systems Ungrounded electrical systems

and toolsand tools Overloaded circuitsOverloaded circuits Damaged power tools and Damaged power tools and

equipmentequipment Using the wrong PPE and toolsUsing the wrong PPE and tools Overhead power linesOverhead power lines All hazards are made worse in wet All hazards are made worse in wet

conditionsconditions Damaged extension cordsDamaged extension cords Unqualified workers doing Unqualified workers doing

electrical workelectrical work

Protective MeasuresProtective Measures Proper groundingProper grounding Use GFCI’sUse GFCI’s Use fuses and circuit breakersUse fuses and circuit breakers Guard live partsGuard live parts Lockout/TagoutLockout/Tagout Proper use of flexible cordsProper use of flexible cords Close electrical panels by Close electrical panels by

Competent PersonCompetent Person Employee trainingEmployee training Ensure Competent Person on Ensure Competent Person on

sitesite Use proper approved electrical Use proper approved electrical

equipmentequipment Qualified person install Qualified person install

electrical deviceselectrical devices

REVIEW QUESTIONSREVIEW QUESTIONS True or False?True or False?

1.1. Shocks and Electrocutions are the most Shocks and Electrocutions are the most common type of electrical accident and are common type of electrical accident and are the fourth leading cause of worker deaths.the fourth leading cause of worker deaths.

2.2. The human body will not conduct The human body will not conduct electricity.electricity.

3.3. It takes at least 1 amp going through a It takes at least 1 amp going through a worker to kill them.worker to kill them.

4.4. Insulation on extension cords & elevating Insulation on extension cords & elevating power lines are examples of protection power lines are examples of protection through isolation.through isolation.


REVIEW QUESTIONSREVIEW QUESTIONS True or False? True or False?

5.5. All portable and semi-portable tools and All portable and semi-portable tools and equipment must be grounded unless equipment must be grounded unless double insulated.double insulated.

6.6. You, your tools, and the materials you are You, your tools, and the materials you are working with, must never be closer than 3 working with, must never be closer than 3 feetfeet of energized power lines!of energized power lines!

7.7. Electric equipment operating at 50 volts or Electric equipment operating at 50 volts or more must be guarded!more must be guarded!

8.8. All circuits and extension cords must be All circuits and extension cords must be grounded.grounded.


REVIEW QUESTIONSREVIEW QUESTIONS True or False?True or False?

9.9. Circuit breakers and fuses are designed to Circuit breakers and fuses are designed to protect the worker from electrocution. protect the worker from electrocution.

10.10. GFCI protection or Assured Ground GFCI protection or Assured Ground Continuity is required on all temporary Continuity is required on all temporary circuits.circuits.

11.11. Extension cords are not required to have Extension cords are not required to have a ground prong when they are GFCI-a ground prong when they are GFCI-protected.protected.

12.12. It is OK to work on a circuit which has not It is OK to work on a circuit which has not been de-energized. been de-energized.


Masonry Electrical Safety Training by Rocky Mountain Masonry Institute

Health & Medicine

masonry electrical

electrically

electric equipment

circuit breakers

electric drill

wet locations

ventricular

metal ladders