Electrical Safety Culture
Identify three (3) of the eight (8) potential injuries from an electrical event.
What are Burns, Cardiac Death, Amputation, Memory Loss, Hearing Loss, Fracture, Cataract, Blast Plasma
Name the three (3) recognized electrical hazards that can cause injury or death while a person works on or near electrical equipment or systems.
What are ELECTRIC SHOCK, ARC FLASH, ARC BLAST
__________ is a direct result of an arc-blast event?
What is PRESSURE
Name 3 power sources that require lock out procedure ?
Electrical, mechanical, hydraulic, pneumatic (Not just electrical)
Which of the following is not considered to be a fault current?
Ground Fault, Short, Overcurrent.
Overcurrent
An arc flash hazard is a dangerous condition caused by the release of energy in a(n) ____________?
What is an ELECTRIC ARC
Contact with bare energized electrical conductive parts, causing current flow through the body that results in a failure of body functions and leads to death is best described as ______________?
What is ELECTROCUTION
Human skin resistance decreases when the bare body part is _______, compared to when ________?
What is WET / DRY
Employers must comply with the _____ ______ _____ found in Section 5 of the OSH Act, which is generally cited when no specific OSHA standard applies to the hazard?
What is GENERAL DUTY CLAUSE
If a utility replace a transformer with a new one that has a higher impedence, what will the available fault current do at the Main distribution panel?
It will go down.
Protective systems, such as work practices and PPE can help to ________ or __________ exposure to hazards?
What is REDUCE / ELIMINATE
In an average person ____ to ____ mA is range of current that causes the muscles to lock up and is call the ________?
What is 10 to 40 mA / LET-GO THRESHOLD
Burns are the most prevalent consequence of electrical incidents. These injuries can be due to either _________ or ___________
Electrical Contact (Electric Shock or Arc Flash
The two standards applicable to the majority of the work performed by electrical workers are found in ______ which applies Construction and ______ which applies General Industry?
What is PART 1926 / PART 1910
The available fault current is typically highest at this point within a building.
Where it enters the building or at the Main distribution Panel.
A _________ is defined in NFPA 70E as a dangerous condition such that contact or equipment failure can result in electric shock, arc flash burn, thermal burn, or blast.
Electrical Hazard
Arc-rated suits and other arc-rated clothing used to protect Electrical Workers from arc-flash hazards are also rated to protect workers from________
Blast Hazards
What is the established minimum distance approach boundary for work around exposed power lines?
10 ft
What is the typical arc fault rating of most 250 Volt, molded case circuit breakers in branch panels?
20,000- 25,000 amps
Live parts to which an employee might be exposed must be de-energized before the employee works on or near them, unless the _______ can demonstrate that de-energizing introduces additional or increased hazards or is infeasible due to equipment design or operational limitations.
Employer
During an arcing fault event, the temperature of the arc terminals can reach approximately 35,000 °F, which is about ________ as hot as the surface of the sun.
What is FOUR TIMES
What's the functionality of a GFCI
It monitors current going out on the hot and returning on the neutral. When it senses an imbalance of 6 mA it will trip.
What is the full Load amps for a 3 Phase, 300 KVA transformer with a 480 Volt primary.
361.27 Amps