Engr. Claire P. De Sosa, MoE
Department of Electrical Engineering
College of Engineering-WMSU
ELECTRICAL SAFETY
HAZARDS AWARENESS
•ELECTRICAL CURRENT
•SAFE WORK PRACTICES
•ELECTRICAL EMERGENCIES
• most commonly recognized hazard is electrical
shock.
• The second type of hazard is electrical burns
• and the third is the effects of blasts which
include pressure impact, flying particles from
vaporized conductors and first breath
considerations.
• Electric shock occurs when the body becomes
part of an electrical circuit
It can happen in 3 ways:
a. A person may come in contact with both
conductors in a circuit.
b. A person may provide a path between an
ungrounded conductor and the ground.
c. A person may provide a path between the
ground and a conducting material that is in
contact with an ungrounded conductor.
Gallons, liters (volume)
Gallon/min
Ampere
volts
• In transmission-line terminology, "low voltage" is much
higher than the 600 volts.
• The extent of injury accompanying electric shock
depends on three factors.
a. The amount of current conducted through the body.
b. The path of the current through the body.
c. The length of time a person is subjected to the current.
Note: The amount of the current depends on the
potential difference and the resistance. the potential
An electric shock can injure you in either or both
of the following.
• A severe shock can stop the heart or the
breathing muscles, or both.
• The heating effects of the current can cause
severe burns, especially at points where the
electricity enters and leaves the body.
Note: Current is the killing factor in electrical
shock.
SAFE WORK PRACTICES
“KNOWLEDGE IS
POWER”
“AKALA KO…”, “BAKA KASI…. “ , “DI KO ALAM SINUNOD KO LANG YUNG
UTOS NI FOREMAN…”
• current is the killer not
volts, you can have
thousands of volts but
with out flow (current)
the danger is minimal.
• This is the reason why
we can conduct live line
works
“ DO THE RIGHT
THING THE FIRST
TIME”
THERE MAY NO BE SECOND TIME
II.
III.
• circuit is dead, treat all circuit as live
• Someone check it already, verify, confirm and
re-check if necessary
• “pwede na yan”, it should be within the
standard