CME Grounding, Bonding & Overcurrent Protection 3

Question 1

Per NEC 250.119, equipment grounding conductors must be identified by which of the following?

Accepted Answer

Green insulation, green with yellow stripes, or bare conductor

Answer

NEC 250.119 requires EGCs to be identified by green insulation, green with yellow stripe insulation, or as a bare conductor to distinguish them from current-carrying conductors.

Question 2

Per NEC 250.53(A)(2), when is a supplemental grounding electrode required when a single rod, pipe, or plate electrode is used?

Accepted Answer

When the single electrode has a resistance to ground exceeding 25 ohms

Answer

NEC 250.53(A)(2) requires a supplemental electrode when a single rod, pipe, or plate electrode has a resistance to ground exceeding 25 ohms.

Question 3

Per NEC 250.64(B), a grounding electrode conductor of what size or smaller must be protected from physical damage by installation in a raceway or armor?

Accepted Answer

6 AWG or smaller

Answer

NEC 250.64(B) requires that a 6 AWG or smaller copper GEC exposed to physical damage be protected by installing it in rigid metal conduit, IMC, PVC conduit, EMT, or cable armor.

Question 4

Per NEC 250.70, connections of grounding electrode conductors to grounding electrodes must be made using:

Accepted Answer

Listed lugs, listed pressure connectors, listed clamps, or other listed means approved for the purpose

Answer

NEC 250.70 requires that connections of GECs to grounding electrodes use listed lugs, listed pressure connectors, listed clamps, or other listed means approved for the material and electrode type.

Question 5

Per NEC 240.4(D)(3), what is the maximum overcurrent protection permitted for a 10 AWG copper branch-circuit conductor?

Accepted Answer

30A

Answer

NEC 240.4(D)(3) limits overcurrent protection for 10 AWG copper conductors to a maximum of 30A in branch circuits.

(CME) Certified Master Electrician Practice Test

(CME) Certified Master Electrician Practice Test

CME Grounding, Bonding & Overcurrent Protection 3