E2 Emergency and Standby Systems 2

Question 1

Under NEC Article 700, how soon must an emergency system automatically restore power after normal supply fails?

Accepted Answer

Within 10 seconds

Answer

Within 1 second

Answer

Within 30 seconds

Answer

Within 60 seconds

Question 2

Which NEC article governs Legally Required Standby Systems in commercial occupancies?

Accepted Answer

Article 701

Answer

Article 700

Answer

Article 702

Answer

Article 708

Question 3

An automatic transfer switch (ATS) for an emergency system must be listed and be capable of withstanding:

Accepted Answer

Available fault current at the point of installation

Answer

Only the rated load current

Answer

125% of full load current

Answer

The utility transformer rating

Question 4

Emergency system branch circuits must be kept entirely independent of other wiring with a limited exception for:

Accepted Answer

Transfer equipment and exit lighting enclosures listed for the purpose

Answer

Transfer switch enclosures only

Answer

Common junction boxes shared with normal wiring

Answer

Conduit runs that share a common raceway

Question 5

A generator used as the alternate power source for an emergency system must be provided with selective coordination from the emergency panel to the transfer switch for fault currents lasting:

Accepted Answer

0.1 second and longer

Answer

0.5 second and longer

Answer

1 second and longer

Answer

10 seconds and longer

Question 6

Where must the location of emergency system components be indicated in a commercial building?

Accepted Answer

On a drawing posted at the main service location

Answer

On exterior signage only

Answer

In the certificate of occupancy

Answer

In the building's maintenance manual only

Question 7

Emergency lighting circuits supplying exit signs must be capable of operating for a minimum of:

Accepted Answer

90 minutes on battery backup

Answer

30 minutes on battery backup

Answer

60 minutes on battery backup

Answer

120 minutes on battery backup