Electrical Electrical Safety Safety
Jan 02, 2016
DefinitionsDefinitions
Exposed partExposed part
Live or energized partLive or energized part
De-energized De-energized partpart
1a
DefinitionsDefinitions
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
Clearance for unguarded, Clearance for unguarded, overhead energized linesoverhead energized lines
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
Clearance for unguarded, Clearance for unguarded, overhead energized linesoverhead energized lines
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
Clearance for unguarded, Clearance for unguarded, overhead energized linesoverhead energized lines
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
Clearance between overhead Clearance between overhead lines and vehicles/equipmentlines and vehicles/equipment
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
Clearance between overhead Clearance between overhead lines and vehicles/equipmentlines and vehicles/equipment
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
Clearance between overhead Clearance between overhead lines and vehicles/equipmentlines and vehicles/equipment
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
Clearance between overhead Clearance between overhead lines and vehicles/equipmentlines and vehicles/equipment
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
Procedures for using portable Procedures for using portable electrical equipmentelectrical equipment
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
Procedures for using portable Procedures for using portable electrical equipmentelectrical equipment
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
Procedures for using portable Procedures for using portable electrical equipmentelectrical equipment
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
Procedures for using portable Procedures for using portable electrical equipmentelectrical equipment
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
Procedures for using portable Procedures for using portable electrical equipmentelectrical equipment
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
Procedures for using portable Procedures for using portable electrical equipmentelectrical equipment
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
Procedures for using portable Procedures for using portable electrical equipmentelectrical equipment
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
Procedures for using portable Procedures for using portable electrical equipmentelectrical equipment
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
Procedures for using portable Procedures for using portable electrical equipmentelectrical equipment
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
DefinitionsDefinitions
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
Summary of key pointsSummary of key points
Nonconductive laddersNonconductive ladders
Nonconductive clothingNonconductive clothing
Proper use of cords, plugs, Proper use of cords, plugs, receptaclesreceptacles
10b