E2 Emergency and Standby Systems 3

Question 1

Which of the following loads is most likely served by a Legally Required Standby System (Article 701) rather than an Emergency System (Article 700)?

Accepted Answer

HVAC for heating a refrigerated warehouse

Answer

Legally Required Standby Systems (Article 701) serve loads required by code for industrial and commercial processes but not directly life-safety, such as HVAC for cold storage.

Question 2

Under NEC 701.12, a legally required standby generator must restore power within:

Accepted Answer

60 seconds

Answer

Article 701.12 allows up to 60 seconds for legally required standby systems to restore power, unlike the 10-second requirement for emergency systems.

Question 3

A commercial inspector finds emergency generator feeder conductors in the same conduit as normal-power feeders. This is:

Accepted Answer

A violation of NEC 700.10

Answer

NEC 700.10(B) requires emergency system wiring to be kept entirely independent of other wiring in separate conduits, cables, or raceways.

Question 4

Storage batteries used as an emergency source under NEC 700 must be:

Accepted Answer

Automatically charged and maintained by a dependable charging means

Answer

NEC 700.12(A) requires storage batteries used for emergency systems to be automatically charged and maintained in a fully charged condition.

Question 5

For a required periodic test of an emergency generator, NEC 700.3(B) requires testing under load for at least:

Accepted Answer

30 minutes monthly

Answer

NEC 700.3(B) requires emergency generators to be tested monthly at not less than 30% of the EPS nameplate rating for 30 minutes.

(E2) E2 Commercial Electrical Inspector Practice Test

(E2) E2 Commercial Electrical Inspector Practice Test

E2 Emergency and Standby Systems 3