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Building Systems > PDX_22_Electrical Part 2 > Flashcards

PDX_22_Electrical Part 2 Flashcards

0
Q

Tubes that house, protect, support, and provide grounding for wiring

A

Conduit

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1
Q

Means by which a current is conducted

A

Conductor

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2
Q

Safeguards that allows a current to find an easy path of the earth, eliminating electrical load and protecting people from shock.

A

Grounding

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3
Q

Accidental low resistance connection between two components of an electrical circuit that are meant to be a different voltages.

A

Short circuit

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4
Q

A material of very low conductivity used to separate electrical conductors and prevent leakage of electrical currents

A

Insulation

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5
Q

A device which converts power and one kind of system to power in another form, such as loudspeaker which converts electric power to acoustic power

A

Transducer

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6
Q

Conductor sizes are based onthese two designation systems

A

American wire gauge (AWG)

And

thousand circular mill (MCM)

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7
Q

In the American wire gauge system increasing gauge numbers indicate:

A

Decreasing wire diameters.

Number 0000 AWG,
Aka 4/0, is largest. Above that MCM Cable sizes of 250, 400, and 500 are used.

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8
Q

Circular mill uses this minimum gauge in buildings

A

Minimum 14 gauge

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9
Q

This why are typically requires a special installer. Oxide can form when joints loosen and or overheat. Must be larger than copper to carry amperage. Limited to primary circuits because of overheating. Primarily commercial application.

A

Aluminum

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10
Q

This wire type has the same caring capacity as aluminum but smaller and cheaper. Most cost-effective for small and medium size wire and cable. Primary use is residential and small construction.

A

Copper wire

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11
Q

This cable type requires no conduit. Must be protected from damage within walls. Two or more plastic insulated conductors and ground surrounded by a moisture resistant sleeve. Typically used in residential wood framed buildings less than three stories.

A

Romex

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12
Q

This cable type is flexible metal clad. It has two or more plastic insulated conductors in case in the spiral wound strip of steel tape. No conduit is required and it can easily be pulled. Hence its use in remodels and residential.

A

Flex metalclad cable (BX)

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13
Q

This conductor is a rectangular bar of copper that carries high-voltage. It’s used in place of very large cables and high currents.

A

Busbar

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14
Q

Multiple busbars in a metal housing.

A

Bus away

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15
Q

Primary conduit functions:

A

Support and protect wiring.
Serves as ground.
Protects surrounding construction from fire in case of overheating.

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16
Q

This type of conduit is the safest type. After pipe was installed (indoor/outdoor) wires are pulled through. Connections are rigid and threaded like plumbing pipes. Connect to j-boxes and devices.

A

Rigid steel

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17
Q

This type of steel conduit with Center walls but same outside diameter as rigid. It’s more economical and also used with threaded fittings.

A

Intermediate metallic conduit

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18
Q

This conduit pipe is used everywhere except underground. It reduces vibration transmission from equipment we’re not possible to install rigid.

A

Flexible metal conduit

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19
Q

This conduit type is the thinnest metal. It’s too thin to thread so connections are made with clamps. It’s easy and fast to install but not allowed in hazardous areas.

A

Electric metallic tubing

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20
Q

These are channels for holding electrical wires

A

Raceways

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21
Q

These proprietary steel raceways her cast into concrete floor at regular spacing of 4, 5 or 6 feet.

A

Underfloor ducts

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22
Q

These raceways are part of the structural floor, essentially metal decking used for cable raceways

A

Cellular metal floors.

23
Q

This thin flat wiring can be laid under carpet without protruding, must be used with carpet tile for ease of access

A

Under carpet wiring

24
Q

The ratio of average power used to the maximum power demand

A

Load factor

25
Q

The buildings electrical system is designed to avoid peak electricity use

A

Load control

26
Q

Switch that is usually magnetically operated used to open and close an electric current

A

Contactor

27
Q

Set of electrical conductors which extends from the source of energy to a distribution center

A

Feeder

28
Q

The portion of the buildings electrical system extending from the utility companies wires to and including the main switch and meter

A

Service

29
Q

Central electrical distribution center that consists of an assembly of switches, circuit breakers and cables or bus ducts that distribute power to the building

A

Switchgear

30
Q

It component of an electrical supply system which divides and electrical power feed into subsidiary circuit 12 providing a protective fuse or circuit breaker for each circuit, in a common enclosure

A

Panelboard (breaker box)

31
Q

The insulated wires that run between the outlet and the panel board

A

Branch circuit

32
Q

Devices used to protect from overload and short-circuiting

A

Circuit protection

33
Q

Switching device that can make, carry, and break current under normal circuit conditions

A

Circuit breaker

34
Q

A thin strip of metal that melts and breaks and electrical circuit if the current exceeds the safe level

A

Fuse

35
Q

Detect small currently and disconnect the hot wire, typically used in kitchens, bathrooms, and outdoor outlets

A

Ground fault interrupter (GFI)

36
Q

Type of system which mean clued lighting, generators to provide back up our resources in a crisis or when regular systems fail

A

Emergency power system

37
Q

And electrical apparatus that provides emergency power to a load when the input source fails. Typically used to protect computers, data centers, telecom equipment, or whatever power outage can disrupt business.

A

Uninterruptible power supply (UPS)

38
Q

Circuit breakers for main disconnects are ____ amps

A

100 A for main disconnect

39
Q

To account for future expansion, systems should be oversized __%

A

25%

40
Q

Every circuit has these three wires:

A

Hot, neutral, and ground wire

41
Q

To avoid the risk of electric shock, it’s recommended that appliance housings be grounded to :

A

A cold water pipe

42
Q

This is typically used on any 15 or 20 amp circuit where water is or might be present. Always within 6 feet of water source.

A

Ground fault interrupter

43
Q

NEC requires that for single motor installation, the current used in the wire size calculation must be__times the load current from the applicable single phase or three phase tables.

A

1.25 x the load current

44
Q

Low-voltage switching operates on a__V circuit

A

24 V circuit

45
Q

And electrically controlled switch used for switching a power circuit, similar to relay but with higher current ratings. Can be remote controlled.

A

Contactors

46
Q

Raceway as of now become a major architectural consideration that must be addressed early in the design process because of

A

Computers and networking equipment

47
Q

An outlet where one is always energized, and the other is controlled by switch

A

Split wire receptacle

48
Q

Typical outlet mounting height above finished floor:

A

12-18 inches above finish floor

15 inches for ADA

49
Q

Maximum distance between outlets:

No point should be further from an outlet then:

A

12’0” maximum between outlets.

no point should be further than 6 feet from an outlet

50
Q

To count as a required power receptacle, floor receptacles must be no further from an exterior wall than

A

18 inches

51
Q

Minimum circuits required for kitchen counter:

Maximum number of outlets per 20 amp circuit in the kitchen:

A

Minimum of two circuits in the kitchen,

No more than four outlets per 20 amp circuit in the kitchen

52
Q

Maximum distance any point on the wall above a counter can be from an outlet:

A

No greater distance than 24 inches

53
Q

If the building is emergency power supply consist of batteries, they must have a full load capacity of __mins.

A

90 minutes

54
Q

For the purpose of protecting overall building electrical load, continuous loads should be calculated at__% of their actual value

A

125% of their actual continuous load value

Building Systems (37 decks)

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