Licensed Electrical Contractor Licensed Electrical Contractor NEC General Requirements Questions and Answers 3 — Questions and Answers
Question 1: What does NEC 110.3(B) require regarding listed or labeled equipment?
- It must be tested annually by the AHJ
- It must be installed and used in accordance with any instructions included in the listing or labeling (Correct answer)
- It must only be installed by a licensed electrician
- It must be re-listed every five years
Correct answer: It must be installed and used in accordance with any instructions included in the listing or labeling
NEC 110.3(B) mandates that listed or labeled equipment be installed and used in accordance with any instructions included in the listing or labeling.
Question 2: According to NEC 110.26(A)(2), what is the minimum width of the working space in front of electrical equipment?
- 24 inches
- 30 inches or the width of the equipment, whichever is greater (Correct answer)
- 36 inches
- The width of the equipment only
Correct answer: 30 inches or the width of the equipment, whichever is greater
NEC 110.26(A)(2) requires the working space width to be a minimum of 30 inches or the width of the equipment, whichever is greater.
Question 3: Per NEC 110.21(B), what marking is required on arc flash hazard equipment?
- The date of last inspection
- A field-applied hazard marking warning of potential arc flash (Correct answer)
- The name of the installing contractor
- A QR code linking to the equipment manual
Correct answer: A field-applied hazard marking warning of potential arc flash
NEC 110.21(B) requires electrical equipment likely to require examination, adjustment, or maintenance while energized to be field-marked to warn of potential arc flash hazards.
Question 4: What does NEC 110.15 require for the identification of high-leg conductors in a four-wire delta-connected system?
- The high leg must be identified by an orange color (Correct answer)
- The high leg must be the largest conductor
- The high leg must be in the center position of the panel
- The high leg must be marked with yellow tape
Correct answer: The high leg must be identified by an orange color
NEC 110.15 requires the high-leg conductor in a four-wire delta system to be durably marked by an orange outer finish or other effective means.
Question 5: According to NEC 110.22(A), what identification is required at each disconnecting means?
- The voltage rating only
- The name of the installing electrician
- A legible marking indicating its purpose unless located and arranged so the purpose is evident (Correct answer)
- The ampere rating and manufacturer name
Correct answer: A legible marking indicating its purpose unless located and arranged so the purpose is evident
NEC 110.22(A) requires each disconnecting means to be legibly marked to indicate its purpose unless its purpose is evident from its location and arrangement.
Question 6: Per NEC 110.14(B), what is required when conductors are connected by splicing?
- Splices must be soldered in all cases
- Splices must be made with devices identified for the use or by brazing, welding, or soldering with a fusible metal (Correct answer)
- Splices are only permitted inside junction boxes with cover plates
- Splices must be wrapped with at least three layers of electrical tape
Correct answer: Splices must be made with devices identified for the use or by brazing, welding, or soldering with a fusible metal
NEC 110.14(B) requires splices to be made with splicing devices identified for the use or by brazing, welding, or soldering with a fusible metal or alloy.
Licensed Electrical Contractor Licensed Electrical Contractor NEC General Requirements Questions and Answers 3
What does NEC 110.3(B) require regarding listed or labeled equipment?