Journeyman Electrician’s Exam Journeyman Electrician's Emergency and Standby Systems

Question 1

According to NEC Article 700, emergency systems must supply power within how many seconds after loss of normal power?

Accepted Answer

10 seconds

Answer

5 seconds

Answer

15 seconds

Answer

30 seconds

Question 2

Which NEC article specifically governs Legally Required Standby Systems?

Accepted Answer

Article 701

Answer

Article 700

Answer

Article 702

Answer

Article 708

Question 3

What is the minimum battery operating duration required for unit equipment emergency lighting under NEC 700.12(F)?

Accepted Answer

90 minutes

Answer

60 minutes

Answer

120 minutes

Answer

180 minutes

Question 4

Emergency system wiring must remain entirely independent of all other wiring EXCEPT in which location?

Accepted Answer

Transfer equipment enclosures

Answer

Panelboard enclosures

Answer

Junction boxes

Answer

Conduit runs shared with normal circuits

Question 5

An automatic transfer switch (ATS) for emergency systems must be designed to:

Accepted Answer

Prevent interconnection of normal and emergency sources

Answer

Allow brief parallel operation during load transfer

Answer

Operate continuously at 125% of rated load

Answer

Include integral ground fault circuit interruption

Question 6

A generator used as an emergency source under NEC 700.12(B) must transfer the emergency load within:

Accepted Answer

10 seconds

Answer

5 seconds

Answer

30 seconds

Answer

60 seconds

Question 7

Which of the following loads is classified as an emergency system load under NEC Article 700?

Accepted Answer

Exit and egress lighting

Answer

HVAC equipment for a commercial building

Answer

Grocery store refrigeration systems

Answer

Optional UPS for data center equipment