Module Two: Electrical Safety

Ground Fault Circuit Interrupter (GFCI)

A device that will de-energize an electrical circuit or a portion of it if the current to ground exceeds some predetermined value.

Fibrillation

A life threatening condition of the heart in which the muscle fibers contract irregularly.

Ground Fault Circuit Interrupter (GFCI)

A protective device that functions to de-energize a circuit or portion thereof within an established period of time when a current to ground exceeds some predetermined value. This value is less that that required to operate the over-current protective device of the supply circuit..

Grounded Tool

An electrical tool with a three-prong plug at the end of its power cord or some other means to ensure that stray current travels to ground without passing through the body of the operator.

500V

Rating for rubber protective equipment with a beige tag (2.2.1)

OSHA

Requires periodic inspection and testing of protective equipment.(2.1.0)

Class 0 rubber gloves are used when working with voltages less than ____.

a. 500 (2.2.2 Table 3)

The OSHA lockout/tagout rule

applies to any stored energy that could cause injury (electrical, mechanical, hydraulic, chemical, thermal, kinetic or other). (3.1.2)

Low-voltage conductors ____.

c. Are responsible for most electrocution deaths due to frequency of contact. 91.1.0)

Which of these statements correctly describes a double-insulated power tool?

c. It is made entirely of plastic or other nonconducting material (1.0.0)

An important use of a hot stick is to _____.

c. replace fuses. (2.2.5)

The NFPA 70E standard

covers the workplace hazards associated with electrical equipment. (3.2.0)

Which of the following applies in a lockout/tagout procedure?

d. Lockout/tagout devices are installed by every authorized employee involved in the work (3.1.2)

The most life-threatening hazards on a construction site typically include all of the following except:

d. chemical burns (1.0.0)

If a person's heart begins to fibrillate due to an electrical shock, the solution is to _______.

d. have a qualified person use an AED (1.1.0)

Maintaining three-point contact on a ladder

means that you must either have both feet and one hand on the ladder or both hands and one foot as you climb. (4.1.1)

fibrillation

very rapid irregular contractions of the muscle fibers of the heart that result in the heartbeat and pulse going out of rhythm with each other.

Polychlorinated biphenyls (PCBs)

Chemicals used to cool certain types of large transformers and capacitors.

CFR Part 1910

Covers the OSHA standards for general industry (1.1.2)

CFR Part 1926

Covers the OSHA standards for the construction industry. (1.1.2)

Double-insulated/underground tools

Electrical tools that are constructed so that the case is insulated from electrical energy. The case is made of a non-conductive material.

Which of the following is true regarding electrical shock?

The majority of electrical accidents involving electrically operated tools happen when the frame or case of the tool becomes energized. (1.1.0)

Double-insulated/ungrounded tools

Tools that have a case made of nonconductive material and have been constructed so that the case is insulated from electrical energy.

live-dead-test

Used to verify that a circuit is de-energized (1.2.0)