E2 Grounding and Bonding 2

Question 1

What is the minimum size equipment grounding conductor required for a 200-ampere circuit per NEC Table 250.122?

Accepted Answer

4 AWG copper

Answer

6 AWG copper

Answer

2 AWG copper

Answer

8 AWG copper

Question 2

Which NEC article specifically addresses grounding and bonding requirements?

Accepted Answer

Article 250

Answer

Article 230

Answer

Article 300

Answer

Article 310

Question 3

What is the purpose of bonding jumpers in a commercial electrical system?

Accepted Answer

Ensure electrical continuity and reduce impedance

Answer

Increase circuit capacity

Answer

Replace ground fault circuit interrupters

Answer

Limit fault current magnitude

Question 4

A separately derived system must have its grounding electrode conductor connected at which point?

Accepted Answer

Source of the separately derived system

Answer

First disconnect means

Answer

Main service panel

Answer

Any convenient metallic structure

Question 5

What is the maximum resistance allowed between a grounding electrode and the earth per NEC 250.53(A)(2)?

Accepted Answer

25 ohms

Answer

5 ohms

Answer

50 ohms

Answer

100 ohms

Question 6

In a commercial building with multiple services, bonding between services is required to prevent what condition?

Accepted Answer

Voltage differences that can cause hazardous current flow

Answer

Overloading

Answer

Phase imbalance

Answer

Harmonic distortion

Question 7

Which conductor connects the grounded service conductor to the grounding electrode at the service?

Accepted Answer

Grounding electrode conductor

Answer

Equipment grounding conductor

Answer

Main bonding jumper

Answer

System bonding jumper