ESC ESC Electrical Grounding & Bonding

Question 1

What is the primary purpose of electrical grounding in a system?

Accepted Answer

To provide a safe path for fault current to return to the source

Answer

Grounding provides a low-impedance path for fault current to return to the source, enabling overcurrent devices to operate and clear the fault.

Question 2

Which NEC article primarily covers grounding and bonding requirements?

Accepted Answer

Article 250

Answer

NEC Article 250 covers all requirements for grounding and bonding of electrical systems and equipment.

Question 3

What is the primary function of bonding in an electrical system?

Accepted Answer

To establish electrical continuity between conductive parts

Answer

Bonding establishes electrical continuity between conductive components to ensure they are at the same potential and can carry fault current.

Question 4

What is a grounding electrode conductor (GEC)?

Accepted Answer

The conductor connecting the grounding electrode system to the service equipment

Answer

The GEC connects the grounding electrode system to the service equipment neutral or grounded conductor.

Question 5

If a single ground rod does not meet the 25-ohm resistance requirement, what does the NEC require?

Accepted Answer

Install a supplemental grounding electrode

Answer

Per NEC 250.56, if a single ground rod measures more than 25 ohms to ground, a supplemental electrode must be added.

(ESC) Electrical Safety Certification Practice Test