Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Evironmental Systems for Interior Design > Electrical Distribution > Flashcards

Electrical Distribution Flashcards

1
Q

What does a basic electrical circuit require?

A

Power source
Conductors to connect source load
A load
Switch

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

How is wire size determined?

A

With the amount of current (amps).
Wires are protected via plastic coating.
Some codes required wires to be Rubin additional protection such as conduit (MC) armored(BX) or Romex(NM)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

What does NEC stand for?

A

National Electrical Code

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

What determines residential installation?

A

NFOA 70a

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Codes require 2 inspections

A

1) rough in this takes place when you have installed all of the electrical boxes, cables, conduit, and wires to this repoint that you are ready for the walls to be closed up by surfaces.
2) sign off completion and outlet need to be tested

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

What is a rough in ?

A

Ready for wiring or connection of devices

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

What do hot, neutral and ground wires do for current

A

They provide a path

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Where is a GFCI required?

A

All outlets near a water source

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Residential confidence outlet

A

20 a every 20’

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

How many outlets per 20 a circuit?

A

Max 4

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

What outlets are need and how far in a corridor/public space?

A

20a/120v outlet every 50 linear feet

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Offices less than. 400 sf require what?

A

1 outlet every 40 sf
That is (10) outlets which is 5 duplex or 2 quad and 1 duplex

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Offices more than 400 sf require what?

A

(10) outlets min w/ (1) per every additional 100-125=sf

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

What are P&C plans?

A

Power and communication plans they are the beginning point got electrical engineers work.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

What metal makes the best conductors.

A

Silver and gold. But copper is most common. Aluminum s used for larger gauge wires due to weight.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

What is Ampacity?

A

The conductors capacity to carry current.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

How are wires sized?

A

AWG ( American wire gauge)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

What is green difference between a wire and a cable?

A

8 AWG and smaller (8,9,10) is a wire
8 AWG and larger ( 6,5,4) is a cable

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

What are the 6 wiring and distribution requirements?

A
  1. ROMEX (NM) OR ARMORED (BX) CABLE
  2. CONDUIT- RIGID (MC)
  3. BUSWAY/BUSDUCT
  4. RACEWAYS/CABLETRAYS
  5. UNDERFLOOR/IN-SLAB DUCTS
  6. ACCESS FLOOR
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

What does NEMA stand for?

A

National Electrical Manufacturers Association

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

What does NEMA do?

A

defines a busway as a prefabricated electrical distribution system consisting of bus bars in a protective enclosure, including straight lengths, fittings, devices and accessories.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

What are Raceways/cable trays

A

Raceways generally mount on a wall in a room where power and communications cables are terminated. Cable trays are usually overhead or under raised floors but carry open wiring.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

What does a Busway/Busduct do?

A

Used to provide path for larger amounts of power over long distance. High rise buildings and factories

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
24
Q

What is a junction box(j boxes)

A

Can be rigid plastic or metal, that hold sockets

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
25
Q

Power Question Formulas

A

ELECTRICITY
Need to know how many Watts?
Watts= Amps x Volts
Need to know how many Amps?
Amps= watts/volts
Need to know how many Volts?
Volts=watts/amps

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
26
Q

Example Problem

To determine the total number of amps needed for 2,500 watts of standard 120-volt line-voltage lighting:

A

I= W / V
I = 2,500/120
I = 20.83 amps

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
27
Q

Service entrance equipment, interior distribution equipment and loads are all?

A

Components of building electrical systems

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
28
Q

What are the 2 electrical systems in most buildings?

A

Electrical power system
Electrical signal or communication system

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
29
Q

What is the first step electrical engineers do in the electrical system design phase?

A

Start by making an electrical load estimate

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
30
Q

Where are controls and protection devices installed at?

A

Switch-Board

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
31
Q

What do hot wires do before entering a building?

A

Go through an electric meter

32
Q

What does the Main disconnect (service) switch do?

A

Disconnects normal service to the building

33
Q

_____ ______is the maximum volatile that can safely be applied for a unit continuously

A

Rated Voltage

34
Q

What is a transformer?

A

Is a device that transforms alternating currents (AC) of one voltage to AC of another voltage.

35
Q

Why would we use a transformer?

A

When building voltage is difference from the service voltage.

36
Q

What is a switch board?

A

A large free standing assembly of switches and fuses and/or circuit breakers

37
Q

What is a panel board?

A

An electrical panel

38
Q

Where are panel boards located?

A

Surface mounted on solid walls or structural columns

39
Q

What are intelligent panel boards?

A

Compact, centralized programmable microprocessors

40
Q

Where can’t electrical closets be located?

A

Should not be located next to stairwells or other main mean of egress

41
Q

What is the space clearance in front of a panel in an electrical closet?

A

4’

42
Q

What does EMCS stand for?

A

Energy management control systems

43
Q

What is often the greatest load?

A

Lighting

44
Q

What are Home runs?

A

The distance from the first outlet on a circuit to the panel board

45
Q

______ ________ carry the electrical power though out the building to the places it will be used

A

Branch circuits

46
Q

How is a circuit sized?

A

The amount of load it must carry with about 20% of its capacity reserved.

47
Q

How limited are branch circuits in length?

A

Less than 100’

48
Q

Which way should doors to electrical equipment open?

A

They should open out

49
Q

How often should a convience outlet be provided?

A

Every 300 s.f

50
Q

how are conductors rated?

A

They are rated in amps for their capacity to carry current

51
Q

_________ ____________ increases with increasing conductor size and the maximum permissible temperature of 5e insulation protecting the conductor

A

Conductor Ampacity

52
Q

How is heat generated?

A

Current flowing though a wire produces resistance which generates heat

53
Q

When current increases what also must increase?

A

Wire size

54
Q

What does NM stand for?

A

Romex

55
Q

What does AC also stand for
Hint: not he alternating current one

A

BX armored cable

56
Q

What is a raceway?

A

Any channel for supporting and protecting conductors

57
Q

What is an open raceway called?

A

Cable tray

58
Q

The terms _____ and _____ are often used interchanably for assemblies of copper or aluminum bars in a rigid metallic housing

A

Busway/busduct

59
Q

_____ ______ ______ allow lights, small motors, unit heaters, and other equipment to be served without hard wiring

A

Flat cable assemblies

60
Q

_____ is required for Fire resistant construction

A

Conduit

61
Q

What does UFAD stand for?

A

Underfloor air distribution

62
Q

What does PLC stand for?

A

Power line carrier systems

63
Q

When placing an outlet on a wall but there is a door in the middle what do you do ?

A

The receptical would be located within 6’ on either side of it

64
Q

How high above the counter is an outlet located?

A

20” max

65
Q

How high above the floor is an electrical outlet located?

A

15” min

66
Q

How high on a wall is a light switch located? And how far from the door?

A

48” from floor 2.5” from door frame

67
Q

Outlet box, attachment plugs (caps), and wall plates
These are all types of?

A

Wiring Devices

68
Q

What are wiring devices all rated at?

A

300 amps or less and frequently at 20 amps

69
Q

How are wiring devices classified?

A

By grades

70
Q

How were junction boxes designed?

A

To fit within the dimensions of stud walls

71
Q

“A contact device installed at the outlet for connection of a single attachment plug”
This is the definition of?

A

Receptacle

72
Q

The electrical outlets that we plug an electrical cord into is technically known as a _____?

A

Conveniences receptacle

73
Q

What are 2 receptacles called

A

A duplex receptacle or duplex outlet

74
Q

A common wall light switch is a type of general duty safety switch called a?

A

Contractor

75
Q

Electrical devices consume power in standby mode even when turned off or in sleeping mode. This is called?

A

Vampire Loads

Evironmental Systems for Interior Design (21 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions