electrical safety. definitions v exposed part v live or energized part v de-energized part 1a

Electrical Electrical SafetySafety

DefinitionsDefinitions

Exposed partExposed part

Live or energized partLive or energized part

De-energized De-energized partpart

1a


De-energized exposed parts that De-energized exposed parts that are not locked/tagged are are not locked/tagged are considered to be energized considered to be energized exposed partsexposed parts

1b

Working on or near Working on or near exposed electrical partsexposed electrical parts

Don’t work on or near exposed Don’t work on or near exposed electrical parts unless:electrical parts unless:• the part is the part is

de-energized; andde-energized; and• the part is the part is

locked/tagged outlocked/tagged out

2a

Working on or near Working on or near exposed electrical partsexposed electrical parts

Lockout/tagout must be performed Lockout/tagout must be performed by a qualified personby a qualified person

Who is qualified?Who is qualified?

2b

Clearance for unguarded, Clearance for unguarded, overhead energized linesoverhead energized lines

For elevated surfaces and voltages For elevated surfaces and voltages 50kv or less to ground:50kv or less to ground:• the distance is 10 feetthe distance is 10 feet

3a


For elevated surfaces and voltages For elevated surfaces and voltages greater than 50 kv to ground:greater than 50 kv to ground:• the distance is 10 feet plus 4 inches the distance is 10 feet plus 4 inches

for every 10 kv greater than 50 kvfor every 10 kv greater than 50 kv

3b


When working on the ground in the When working on the ground in the vicinity of unguarded, energized vicinity of unguarded, energized overhead lines 50 kv or less to overhead lines 50 kv or less to ground:ground:• keep conductive objects at least 10 keep conductive objects at least 10

feet away feet away

3c


When working on the ground in the When working on the ground in the vicinity of unguarded, energized vicinity of unguarded, energized overhead lines greater than 50 kv overhead lines greater than 50 kv to ground:to ground:• keep conductive objects at least 10 keep conductive objects at least 10

feet away, plus 4 inches for every 10 feet away, plus 4 inches for every 10 kv over 50 kvkv over 50 kv

3d

Clearance between overhead Clearance between overhead lines and vehicles/equipmentlines and vehicles/equipment

For voltages 50 kv or less:For voltages 50 kv or less:• the clearance distance is 10 feetthe clearance distance is 10 feet

For voltages greater than 50 kv:For voltages greater than 50 kv:• the clearance is 10 feet plus 4 inches the clearance is 10 feet plus 4 inches

for every 10 kv over 50 kvfor every 10 kv over 50 kv

4a


For vehicles in transit and the For vehicles in transit and the structure is lowered:structure is lowered:• the clearance distance is 4 feet for 50 the clearance distance is 4 feet for 50

kv or less; orkv or less; or• the clearance distance is 4 feet plus 4 the clearance distance is 4 feet plus 4

inches for every 10 kv over 50 kv for inches for every 10 kv over 50 kv for voltages greater than 50 kvvoltages greater than 50 kv

4b


When insulating barriers designed When insulating barriers designed for line voltage are installed, and for line voltage are installed, and not attached to, or part of, the not attached to, or part of, the vehicle or mechanical equipment:vehicle or mechanical equipment:• the clearance is the designed working the clearance is the designed working

dimensions of the barrierdimensions of the barrier

4c


Avoid contact with any vehicles, Avoid contact with any vehicles, mechanical equipment, or parts mechanical equipment, or parts under energized lines unless:under energized lines unless:• Employee is wearing the proper PPE; Employee is wearing the proper PPE;

oror• Equipment/vehicle is located so that Equipment/vehicle is located so that

no uninsulated part can provide a no uninsulated part can provide a conductive path to employeesconductive path to employees

4d


Do not stand near the grounding Do not stand near the grounding location for intentionally grounded location for intentionally grounded equipment or vehicles when contact equipment or vehicles when contact with overhead wires is possiblewith overhead wires is possible

Use insulation and barriers to Use insulation and barriers to protect employees from the protect employees from the grounding areagrounding area

4e

Use of nonconductive Use of nonconductive laddersladders

Portable ladders must have Portable ladders must have nonconductive siderails when used nonconductive siderails when used near energized partsnear energized parts

Metal ladders can conduct Metal ladders can conduct electricity and cause arcing and electricity and cause arcing and shocksshocks

5a

Hazards of conductive Hazards of conductive apparelapparel

Conductive jewelry and clothing Conductive jewelry and clothing can cause arcing when exposed to can cause arcing when exposed to energized partsenergized parts

If conductive jewelry and clothing If conductive jewelry and clothing are not removed, they must be are not removed, they must be covered so they are no longer covered so they are no longer conductiveconductive

6a

Procedures for using portable Procedures for using portable electrical equipmentelectrical equipment

Proper handling of cordsProper handling of cords• Don’t raise or lower equipment by its Don’t raise or lower equipment by its

cordcord• Don’t unplug the equipment by Don’t unplug the equipment by

pulling on its cordpulling on its cord• Don’t staple or fasten Don’t staple or fasten

the cord so as to the cord so as to damage outer jacketdamage outer jacket

7a


Equipment inspectionEquipment inspection• Visually check for:Visually check for:

– loose partsloose parts– deformed or missing partsdeformed or missing parts– damaged jackets or damaged jackets or

insulationinsulation

7b

Procedures for using portable Procedures for using portable electrical equipment electrical equipment

Equipment inspectionEquipment inspection• Inspect for internal defects, as Inspect for internal defects, as

indicated by pinched or crushed outer indicated by pinched or crushed outer jacketsjackets

• Perform inspections Perform inspections prior to beginning prior to beginning each shifteach shift

7c


Equipment inspectionEquipment inspection• Remove defective equipment from Remove defective equipment from

serviceservice• Check the plug and receptacle mating Check the plug and receptacle mating

configuration configuration before connectingbefore connecting

7d


Flexible cordsFlexible cords• Flexible cords with grounding-type of Flexible cords with grounding-type of

equipment must have an equipment equipment must have an equipment grounding conductorgrounding conductor

• Never remove or alter the Never remove or alter the cord’s grounding pincord’s grounding pin

• Never use an adapter Never use an adapter with a missing with a missing grounding pingrounding pin

7e


Electrical equipment and cords to Electrical equipment and cords to be used near water must be be used near water must be approved for this useapproved for this use

7f


Plugging/unplugging cord and Plugging/unplugging cord and cord-connected equipment and cord-connected equipment and flexible cordsflexible cords• Ensure hands are dryEnsure hands are dry• Never pull the plug Never pull the plug

out by the cordout by the cord

7g


Plugging/unplugging cord and Plugging/unplugging cord and cord-connected equipment and cord-connected equipment and flexible cordsflexible cords• Handle cords and equipment with Handle cords and equipment with

insulating protective equipment when insulating protective equipment when the cord connector is wetthe cord connector is wet

• Secure locking-type connectors after Secure locking-type connectors after making connectionmaking connection

7h


Circuit breakers and circuitsCircuit breakers and circuits• Never use the following to open and Never use the following to open and

close electrical circuitsclose electrical circuits– FusesFuses– Terminal lugsTerminal lugs– Cable connectorsCable connectors– Cable splice Cable splice

connectionsconnections

7i


Circuit breakers and circuitsCircuit breakers and circuits• Don’t manually re-energize a circuit Don’t manually re-energize a circuit

without first determining if the without first determining if the equipment and circuit can be safely equipment and circuit can be safely energizedenergized

7j


Circuit breakers and circuitsCircuit breakers and circuits• Repeatedly closing a circuit breaker Repeatedly closing a circuit breaker

or replacing a fuse is not allowedor replacing a fuse is not allowed• Keep flammables Keep flammables

and combustibles and combustibles away from electrical away from electrical equipmentequipment

7k

Protective equipmentProtective equipment

Use appropriate protective Use appropriate protective equipment in damp or wet equipment in damp or wet environmentsenvironments

Inspect protective equipment to Inspect protective equipment to ensure reliabilityensure reliability

Guard normally enclosed live parts Guard normally enclosed live parts during maintenanceduring maintenance

8a

Alerting techniquesAlerting techniques

Signs and markingsSigns and markings

BarricadesBarricades

AttendantsAttendants

9a

Summary of key pointsSummary of key points


De-energized means locked/tagged De-energized means locked/tagged outout

Safe distances for clearances Safe distances for clearances between workers and energized between workers and energized lineslines

10a


Nonconductive laddersNonconductive ladders

Nonconductive clothingNonconductive clothing

Proper use of cords, plugs, Proper use of cords, plugs, receptaclesreceptacles

10b


Proper use of electrical equipment Proper use of electrical equipment around flammables/combustiblesaround flammables/combustibles

Protective equipmentProtective equipment

Alerting techniquesAlerting techniques

10c

electrical safety. definitions v exposed part v live or energized part v de-energized part 1a

Documents

kv greater

overhead lines greater

energized lineswhen

overhead wires

energized partsmetal

deenergized andthe

vicinity of unguarded

feetfor voltages greater