Module 26102-20, Section 3

Which acronym represents the National Electrical Code?

• NEC 70

• NFPA 70

• NFPA 70E

• NEC 70E

Answer explanation

Trick question! The NEC BOOK is published by the NFPA. If you grab a code book, NFPA 70 will be on cover.

Who is responsible for reading, understanding, and following company safety policies?

• The employee

• The employer

• The superintendent

• company administration

The NFPA 70E requires job safety planning and a job briefing before the start of EACH task

• True

• False

Answer explanation

Did you experience a task briefing in your summer internships?

Module 262102-20, Page 16, Section 3.1.2

What is the most important piece of safety equipment required when performing work in an electrical environment?

• Cut resistant gloves

• On the job training

• Hard hat

• Common sense

Answer explanation

Module26102-20, Page 18, Section 3.1.3

An electrical tool with a three prong plug at the end of its power cord to ensure stray current does not pass through the body of the user is called:

• a double-insulated tool

• a GFCI

• a grounded tool

• a hot stick

Answer explanation

Module 26102-20, page 17, Trade Terms

Where should you stand when operating circuit breakers in low voltage or medium voltage systems?

• use a hot stick; never operate a low voltage or medium voltage circuit manually

• in front of the unit, to maximize visibly being able to see the circuit breaker

• to the side of the unit, to minimize the amount of your body facing the circuit breaker

Answer explanation

Never stand directly in front of circuit breaker when reenergizing it! This does not leave room to protect yourself in the event of an arc blast.

Module 26102-20, Page 21

In what situation would a hot stick be needed to replace a fuse?

• If the system is above 1,000 volts

• If the system is below 1,000 volts

• If the system is energized

• If the system is on a power plant

Answer explanation

Power must be off to remove or replace a fuse.

Module 26102-20, Page 22

ENERGY ISOLATION DEVICES are

• An approved electrical disconnect switch capable of accepting approved LOTO hardware to isolate and secure a hazardous electrical source

• A combination of locks, danger tags, and other devices designed to attach to and secure electrical devices

Answer explanation

LOTO: A combination of locks, danger tags, and other devices designed to attach to and secure isolation devices

^ Lockout/tagout hardware is what locks the energy isolation device.

When a switch is in the "Open" position,

• It is on, with power still connected

• It is off, with power disconnected

Answer explanation

Examine the image. When a switch, breaker, disconnect is OPEN there is no continuity.

No continuity = the electricity has no complete path to travel on = no power

The National Electrical Code (NFPA 70)

• details preventive maintenance for electrical equipment

• provides the minimum requirements for the installation of electrical systems

• provides practical working requirements relative to the hazards of electrical work

• creates national consensus standards

Answer explanation

Module 26102-20, Page 26, Section 3.2.0