Journeyman Electrician’s Exam Journeyman Electrician's Emergency and Standby Systems 3

Question 1

Whether a generator neutral must be bonded to its frame as a separately derived system depends primarily on:

Accepted Answer

Whether the ATS switches the neutral conductor

Answer

The generator's kVA rating

Answer

The distance between the generator and main panel

Answer

The type of fuel used by the generator

Question 2

Emergency system feeder conductors must have an ampacity sufficient to:

Accepted Answer

Handle all emergency loads that could be energized simultaneously

Answer

Carry 125% of the largest single emergency load

Answer

Use the demand factors from NEC Table 220.44

Answer

Match the normal service conductor ampacity

Question 3

A central battery unit used as an emergency lighting source must supply the connected load for a minimum of:

Accepted Answer

90 minutes

Answer

30 minutes

Answer

60 minutes

Answer

120 minutes

Question 4

Exit signs required for means of egress fall under which NEC article?

Accepted Answer

Article 700 — Emergency Systems

Answer

Article 701 — Legally Required Standby

Answer

Article 702 — Optional Standby

Answer

Article 708 — Critical Operations

Question 5

Emergency power systems installed in a health care facility must also comply with which NEC article in addition to Article 700?

Accepted Answer

Article 517

Answer

Article 547

Answer

Article 555

Answer

Article 590

Question 6

A storage battery used as an emergency source per NEC 700.12(A) must maintain voltage at or above what percentage of normal rated voltage under full load?

Accepted Answer

87.5%

Answer

75%

Answer

90%

Answer

95%

Question 7

When emergency system wiring must occupy the same enclosure as normal wiring at a transfer switch, this is permitted because:

Accepted Answer

NEC 700.10(B)(5) specifically exempts transfer equipment from the independence requirement

Answer

Transfer switches are listed for dual-source wiring by default

Answer

Barriers within the enclosure isolate the conductors electrically

Answer

The AHJ grants individual approval for each such installation