Quiz 4 - Commercial Wiring - Unit 5

Question 1

Regarding emergency power,

Answer 1

Section 46 covers emergency power systems

Most local codes require equipment that will automatically provide emergency electric power if the normal power source fails

There is no need for emergency power

Both A and B

Question 2

Emergency lighting,

Answer 2

Has regulation under 46-202(1a)

Is meant to allow people to leave a building

Is battery powered and wall mounted

Has a regulated battery charger supplied by the normal power source

All of the above

Question 3

If the power demand is high for a building, central battery power systems are available for backup power.

Answer 3

True
False

Question 4

According to Figure 5-2, emergency power switches and fuses must have an interrupting capacity not less than the available short-circuit current at their supply terminals.

Answer 4

True
False

Question 5

Emergency generator sources,

Answer 5

Must take into consideration the engine type, generator capacity, and load transfer controls

Has regulation under 46-202(3)

May be used to supply emergency power

All of the above

Question 6

Fuels that are used to power generators are an important consideration in the installation of the system.

Answer 6

True
False

Question 7

Problematic issues with using gasoline as a fuel source for backup generators is that it becomes stale after a short period of time, and it is dangerous.

Answer 7

True
False

Question 8

For air cooled generating units located inside, it is recommended to exhaust hot air to the outside, and bring fresh air into the room for cooling

Answer 8

True
False

Question 9

Backup generators do not require the same voltage output as the normal building supply system.

Answer 9

True
False

Question 10

Some things to consider for choosing the correct capacity of a generator are,

Answer 10

Motors and their startup inrush kVA must be taken into account

If undersized, it will fail and not be able to provide emergency power

If oversized will create additional costs

All of the above

Question 11

Derangement signals,

Answer 11

Should be installed outside the generator room

Are meant to indicate any malfunction, load on the system,

Have both audible and visual alarms

Indicate correct operation of a battery charger

All of the above

Question 12

Automatic transfer equipment,

Answer 12

Use relays as a transfer switch

Has voltage relays

Uses contactors to disconnect the load from the normal power source, then transfers the connection to the generator output

Has regulation under 46-206(1)

All of the above

Question 13

According to 46-108(4b) both normal and emergency supply may enter the same junction box for an exit light.

Answer 13

True
False

Question 14

Figure 5-10 is indicating that according to 46-108 emergency system circuits must be separated from standard circuits.

Answer 14

True
False