CONE 306 Final

600

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

Direct-drive

. ____ compressors are usually used in large installations.

surge protector

6. ____ are available in separate units, which can be used to provide protection on any type of sensitive equipment, such as computers and printers.

25

A washer-dryer is rated for 4000 VA at 208Y/120 volts single-phase. The overcurrent protective device must be rated at least ____ amperes.

20

A washer-dryer rated for 4000 VA at 208Y/120 volts single-phase must have a branch-circuit ampacity of at least ____ amperes.

Nameplate

Air-conditioning and refrigeration equipment is required by NEC®440.4(A) and (B) to be marked with a ____ marked with the maker's name, the rating in volts, frequency and number of phases, and other information.

Motor driven fan

Air-cooled condensers use ____ to drive air across the condensing coil.

The Owners

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.

64.1%

In most instances, the rated load-current (RLA) is at least equal to ____ percent of the hermetic refrigerant motor-compressor's maximum continuous current (MCC).

heater boiler

In the commercial building example of this chapter, the owner may choose to install an electrically heated ____ to supply heat to all areas.

nonlinear

In the computer room circuits in the chapter example, three separate neutral conductors are installed to reduce the possibility of a conductor overheating from ____ currents.

an insulated equipment grounding conductor and not the box

In the computer room example in this chapter, the grounding terminal of each of the special receptacles is connected to a(n) ____.

electromagnetic interference

In the insurance office example in this chapter, a separate, insulated-grounding conductor is installed with the feeder circuit and is connected to the neutral conductor at the service. This grounding system reduces, if not eliminates, the ____ that often is (are) present in the conventional grounding system.

exterior walls

In the insurance office example in this chapter, a special raceway is installed in the ____. This raceway provides for both electrical power and communications.

4

In the water heater circuit example in this chapter, the minimum size conductor, if all terminals are rated 75 degrees Celsius or higher, is ____ AWG as the ampacity in NEC®Table 310.16 is 85 amperes.

125%

NEC® 422.13 requires that the branch circuit overcurrent device and conductors for a storage-type electric water heater with a capacity of 120 gallons (450 L) or less must be sized at not less than ____ percent of the rating of the water heater.

Fault levels

NEC®110.9 states that equipment intended to interrupt current at ____ levels shall have an interrupting rating at nominal circuit voltage at least equal to the current that is available at the line terminals of the equipment.

astronomic

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.

125%

One option for protecting a motor-compressor from overloads and failure to start is to use a time-delay fuse or inverse-time circuit breaker rated at not more than ____ percent of the rated load current.

neoprene gasket

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.

UL Standards

Overload protection of the internal components is covered in the ____ Standards.

Compressor

The ____ component of the refrigerant cycle raises the energy level of the refrigerant so that it can be condensed readily to a liquid.

surge protection

The ____ feature of a receptacle provides protection from lightning and other severe electrical surges that may occur in the electrical system.

the sump pump

The ____ is(are) an example(s) of equipment that is operated by an automatic control system.

115%

The ampere rating of the disconnecting means for HVAC equipment must be at least ____ percent of the sum of all the individual loads within the equipment.

heating thermostat

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

the optional standby power

The circuit to the hot-water circulating pump in the chapter example will be supplied from the ____ so that the water will continue to circulate if the utility power fails

pressure

The compressor serves as a pump to draw the expanded refrigerant gas from the evaporator, boosts the ____ of the gas, and sends it to the condenser.

split system with the compressor and condenser located on the roof and the evaporator located in the basement

The cooling system for the drugstore and bakery in the chapter example is a ____ system with the compressor and condenser located on the ground adjacent to the building and the evaporator located in an air-handling unit in the basement

fin tube

The evaporator in a commercial installation normally consists of a ____ coil, through which the building air is circulated by a motor-driven fan.

65

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.

steel

The hermetic compressor consists of a motor-compressor completely sealed in a gastight, ____ casing.

1. continuous Operation 2.Manual Control 3.Automatic control 4.Timed Control 5.Photocell Control 6.Exit signs in a portion of the building

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 ____.

Continuous operation

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

amplifier

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.

float switch

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

chlorinated hydrofluorides

The tremendous popularity of mechanical refrigeration for household use in the 1930s and 1940s stimulated the development of a new series of nonexplosive and nontoxic refrigerants known as ____ of the halogen family.

circuit

Three-phase circuits result in a smaller ____ than if a 1-phase circuit were installed.

3-phase supply

Water heaters are available for commercial occupancies in many sizes and voltages, and for both single and ____ supply.

voltage drop

When tabulating materials, take special note of long runs of raceway or cable and determine whether ____ is a problem. This can mean an increase in conductor and/or raceway size.

Machine-room-less

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

on the outside of the building

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

Refrigeration

____ is a method of removing energy in the form of heat from an object.

Combination lighting

in the insurance office example in this chapter, the reception area has a(n) ____ to provide a different "look" for the clients.