Deck 11: Special Circuits Owners Circuits

Question 1

In the commercial building, what do the owner's circuits serve?

Answer 1

In the commercial building, the owner's circuits serve:
∙ the elevator equipment that has the greatest electrical demand.
∙ heating and lighting for the public restrooms, hallway, and stairways as well as the exit signs for the basement, rear entrance hallway, and the second floor hallway.
∙ loads that are to be supplied by the optional standby power system.

Question 2

When diagramming the connection and control of water-circulating pumps, what components should be included?

Answer 2

The following should be included:
∙ thermostats in each occupancy
∙ relays
∙ 4×4 wireway
∙ floor line
∙ typical conduit run under concrete floor
∙ circulating pump
∙ running overcurrent protection installed in manual motor controller
∙ panelboard supplied by generator.

Question 3

What features are available with electronic and mechanical timers?

Answer 3

Electronic and mechanical timers are available with many different features such as these:
• Same day/same time on/off
• Same day/different time on/off
• Different day(s) same time on/off
• Different day(s)/different times on/off
• Self-adjustment for seasonal changes
• Options to skip a day(s)
• Automatic adjustment for daylight saving time
• Battery backup to save settings in the event of a major power outage
• Multiple on/off time settings.

Question 4

The sump pump motor is protected by a manual motor starter and is controlled by a switch.

A)photocell
B)snap
C)pressure
D)float

Question 5

In the boiler heating circuit, the main lugs connect to two -kcmil-per-phase conductors run to an 800-ampere switch.

A)200
B)400
C)500
D)600

Question 6

An electrically heated may supply heat to all areas of a commercial building.

A)boiler
B)radiator
C)stove
D)furnace

Question 7

The lighting circuits that are considered to be the owner's responsibility can be divided into six groups according to the method used to control the circuit, including those under .

A)photocell control
B)solar control
C)joint control
D)intermittent operation

Question 8

In a commercial building, it is the responsibility to provide power for the elevator; illumination for the public areas such as hallways, stairways, and public toilet rooms; and heat for the common areas of the building.

A)owner's
B)occupants'
C)municipality's
D)electric company's

Question 9

One type of sump pump that is available commercially has a start-stop operation due to water pressure against a , which in turn pushes against a small integral switch within the submersible pump.

A)snap switch
B)neoprene gasket
C)steel ell
D)float switch

Question 10

The luminaires installed for the stairway to the second floor and hallways of a commercial building are when the building is occupied because those spaces have no windows.

A)under manual control
B)in continuous operation
C)on at night
D)under timed control

Question 11

How is the sump pump used, and what is the mechanism of control?

Question 12

The is an example of equipment that is operated by an automatic control system.

A)stairway luminaire
B)sump pump
C)entrance luminaire
D)exterior luminaires

Question 13

The photocell control device consists of a light-sensitive cell and a(n) that increases the signal until it is sufficient to operate a relay that controls the light.

A)motor
B)lens
C)luminaire
D)amplifier

Question 14

The heat sensor in an electrically heated boiler is adjusted so that it closes when the outside temperature falls below a set point, usually degrees Fahrenheit.

A)50
B)65
C)70
D)85

Question 15

On lighting controlled by timers, an feature is extremely desirable because it provides sunset ON and sunrise OFF that change automatically day by day as the sunrise and sunset times change every day.

A)astronomic
B)environmental
C)ecologic
D)astrologic

Question 16

The circuit to the circulating pump will be supplied from the so that the water will continue to circulate if the utility power fails.

A)standby emergency boiler
B)external emergency panel
C)optional standby power panel
D)public panel

Question 17

With a " " elevator, all the elevator lifting mechanism is located in the elevator shaft either on the elevator or on the wall.

A)room-less
B)motor-room-less
C)machine-room-less
D)control-room-less

Question 18

The building's occupants will each have a(n) located within their particular area.

A)circulating pump
B)outdoor heat sensor
C)relay
D)heating thermostat

Question 19

Summarize the wiring requirements for a boiler.

Question 20

With an electrically heated boiler, a heat sensor plus a remote bulb is mounted so that the bulb is .

A)in direct sunlight
B)on the outside of the building
C)next to the emergency panel
D)in the boiler