electrical safety - cal state la services/electrical_safety...electrical safety . definitions •...
TRANSCRIPT
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Electrical Safety
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Definitions
• Exposed part
• Live or energized part
• De-energized part
1a
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• De-energized exposed parts that are not locked/tagged are considered to be energized exposed parts
1b
Definitions
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Working on or near exposed electrical parts
• Don’t work on or near exposed electrical parts unless: • the part is de-energized, • the part is locked/tagged
out, and • the part is tested to
ensure it is de-energized
2a
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Working on or near exposed electrical parts
• Lockout/tagout must be performed by a qualified person
• Who is qualified?
2b
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Clearance for unguarded, overhead energized lines
• For unqualified employees working near elevated surfaces and voltages 50kv or less to ground: • the distance is 10 feet
3a
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Clearance for unguarded, overhead energized lines • For elevated surfaces and
voltages greater than 50 kv to ground: • the distance is 10 feet plus
4 inches for every 10 kv greater than 50 kv
3b
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Clearance for unguarded, overhead energized lines
• When working on the ground in the vicinity of unguarded, energized overhead lines 50 kv or less to ground: • keep conductive objects at least 10 feet
away
3c
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Clearance for unguarded, overhead energized lines
• When working on the ground in the vicinity of unguarded, energized overhead lines greater than 50 kv to ground: • keep conductive objects at least
10 feet away, plus 4 inches for every 10 kv over 50 kv
3d
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Clearance between overhead lines and vehicles/equipment
• For voltages 50 kv or less: • the clearance distance is
10 feet
• For voltages greater than 50 kv: • the clearance is 10 feet
plus 4 inches for every 10 kv over 50 kv
4a
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Clearance between overhead lines and vehicles/equipment
• For vehicles in transit and the structure is lowered: • the clearance distance is
4 feet for 50 kv or less; or • the clearance distance is
4 feet plus 4 inches for every 10 kv over 50 kv for voltages greater than 50 kv
4b
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Clearance between overhead lines and vehicles/equipment • When insulating barriers designed
for line voltage are installed, and not attached to, or part of, the vehicle or mechanical equipment: • the clearance is the
designed working dimensions of the barrier
4c
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Clearance between overhead lines and vehicles/equipment • Employees standing on the ground must
avoid contact with any vehicles, mechanical equipment, or parts under energized lines unless: • employee is wearing the proper electrical
PPE; or • equipment/vehicle is
located so that no uninsulated part can provide a conductive path to employees
4d
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Clearance between overhead lines and vehicles/equipment • Do not stand near the grounding
location for intentionally grounded equipment or vehicles when contact with overhead wires is possible
• Use insulation and barriers to protect employees from the grounding area
4e
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Use of nonconductive ladders
• Portable ladders must have nonconductive side rails when used near energized parts
• Metal ladders can conduct electricity and cause arcing and shocks
5a
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Hazards of conductive apparel
• Conductive jewelry and clothing can cause arcing when exposed to energized parts
• If conductive jewelry and clothing are not removed, they must be covered so they are no longer conductive
6a
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Procedures for using portable electrical equipment • Proper handling of cords
• don’t raise or lower equipment by its cord
• don’t unplug the equipment by pulling on its cord
• don’t staple or fasten the cord so as to damage outer jacket
7a
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Procedures for using portable electrical equipment
• Equipment inspection • visually check for:
• loose parts • deformed or
missing parts • damaged
jackets or insulation
7b
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Procedures for using portable electrical equipment
• Equipment inspection • inspect for internal defects,
as indicated by pinched or crushed outer jackets
• perform inspections prior to beginning each shift
7c
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Procedures for using portable electrical equipment • Equipment inspection
• remove defective equipment from service
• check the plug and receptacle mating configuration before connecting
7d
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Procedures for using portable electrical equipment • Flexible cords
• flexible cords with grounding-type of equipment must have an equipment grounding conductor
• never remove or alter the cord’s grounding pin
7e
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Procedures for using portable electrical equipment
• Never use an adapter with a missing grounding pin. Adapters cannot interrupt the continuity of the grounding connection.
• Electrical equipment and cords to be used near water must be approved for this use
7f
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Procedures for using portable electrical equipment • Plugging/unplugging
cord and cord- connected equipment and flexible cords • ensure hands are dry • never pull the plug
out by the cord • Adapters cannot interrupt
the continuity of the grounding connection.
7g
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Procedures for using portable electrical equipment • Plugging/unplugging cord and cord-
connected equipment and flexible cords • handle cords and equipment with
insulating protective equipment if the condition of the connection could provide a conducting path to the employee. An example is: when the cord connector is wet
• Secure locking-type connectors after making connection
7h
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Electric power and lighting circuits
• Circuit breakers and load rated switches • never use the following to open and close
electrical circuits • fuses • terminal lugs • cable connectors • cable splice
connections
8a
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Electric power and lighting circuits • Circuit breakers and load rated
switches • don’t manually re-energize a circuit
without first determining if the equipment and circuit can be safely energized
• repeatedly closing a circuit breaker or replacing a fuse is not allowed
8b
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Protective equipment
• Use appropriate protective equipment in areas where there are potential electrical hazards
• Inspect protective equipment to ensure reliability
9a
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Alerting techniques
• Signs and markings
• Barricades
• Attendants
10a
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Summary of key points
• Definitions
• De-energized means locked/tagged out and tested
• Safe distances for clearances between workers and energized lines
11a
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Summary of key points
• Nonconductive ladders
• Nonconductive clothing
• Proper use of cords, plugs, receptacles
11b
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Summary of key points
• Protective equipment
• Alerting techniques
11c