ICC Electrical Systems and Safety 2

Question 1

In Illinois, what is the maximum voltage permitted for temporary wiring used during construction?

Accepted Answer

600V

Answer

Temporary wiring used during construction is permitted up to 600 volts under NEC guidelines adopted in Illinois.

Question 2

Which type of conduit is required in areas exposed to physical damage in Illinois commercial buildings?

Accepted Answer

Rigid Metal Conduit (RMC)

Answer

Rigid Metal Conduit (RMC) provides the highest physical protection and is required in areas subject to physical damage.

Question 3

What is the purpose of an equipment grounding conductor in an electrical circuit?

Accepted Answer

To provide a low-impedance fault path that trips the breaker

Answer

The equipment grounding conductor provides a safe fault return path that causes the overcurrent device to trip quickly during a fault.

Question 4

Before excavating near underground utilities in Illinois, contractors are legally required to call:

Accepted Answer

JULIE (811 — Joint Utility Locating Information for Excavators)

Answer

Illinois law requires contractors to call JULIE (811) at least 48 hours before excavating to have underground utilities marked.

Question 5

What does the term 'bonding' mean in electrical installations?

Accepted Answer

Joining metallic parts to ensure electrical continuity and conductivity

Answer

Bonding connects all metallic parts of an electrical system together to prevent dangerous voltage differences between them.

ICC - Illinois Commerce Commission Certified Contractor Practice Test