CEA NEC Wiring and Protection 4

Question 1

Under NEC 225.30, how many sets of service-entrance conductors are generally allowed to supply a building from outside wiring?

Accepted Answer

Only one, with limited exceptions

Answer

NEC 225.30 generally limits a building to one set of feeder or branch-circuit conductors from outside unless specific exceptions apply.

Question 2

According to NEC 210.19(A), branch-circuit conductors must have an ampacity not less than what percentage of the continuous load plus the non-continuous load?

Accepted Answer

125% of continuous + 100% of non-continuous

Answer

NEC 210.19(A) requires conductors to be sized at 125% of the continuous load plus 100% of the non-continuous load.

Question 3

Which wiring method is permitted in a Class I, Division 1 hazardous location per NEC Article 501?

Accepted Answer

Rigid metal conduit (RMC) with explosionproof fittings

Answer

In Class I, Division 1 locations, NEC 501.10(A) requires threaded rigid metal conduit or steel IMC with explosionproof fittings.

Question 4

Per NEC 334.15, where NM cable is run exposed on the surface of finished walls in a dwelling, it must follow the surface and be protected from:

Accepted Answer

Physical damage in exposed or accessible locations

Answer

NEC 334.15 requires NM cable run exposed on building surfaces to be protected from physical damage and to closely follow the surface.

Question 5

What is the maximum overcurrent protection permitted for a 12 AWG copper conductor on a general-purpose branch circuit per NEC 240.4(D)?

Accepted Answer

20 amperes

Answer

NEC 240.4(D)(5) limits 12 AWG copper conductors to a maximum 20-ampere overcurrent device on general-purpose branch circuits.

(CEA) Certified Electrical Apprentice Practice Test

(CEA) Certified Electrical Apprentice Practice Test

CEA NEC Wiring and Protection 4