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Evironmental Systems for Interior Design > Electrical Distribution > Flashcards

Electrical Distribution Flashcards

(75 cards)

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1
Q

What does a basic electrical circuit require?

A

Power source
Conductors to connect source load
A load
Switch

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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)

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3
Q

What does NEC stand for?

A

National Electrical Code

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4
Q

What determines residential installation?

A

NFOA 70a

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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

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6
Q

What is a rough in ?

A

Ready for wiring or connection of devices

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7
Q

What do hot, neutral and ground wires do for current

A

They provide a path

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8
Q

Where is a GFCI required?

A

All outlets near a water source

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9
Q

Residential confidence outlet

A

20 a every 20’

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10
Q

How many outlets per 20 a circuit?

A

Max 4

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11
Q

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

A

20a/120v outlet every 50 linear feet

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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

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13
Q

Offices more than 400 sf require what?

A

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

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14
Q

What are P&C plans?

A

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

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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.

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16
Q

What is Ampacity?

A

The conductors capacity to carry current.

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17
Q

How are wires sized?

A

AWG ( American wire gauge)

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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

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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
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20
Q

What does NEMA stand for?

A

National Electrical Manufacturers Association

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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.

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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.

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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

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24
Q

What is a junction box(j boxes)

A

Can be rigid plastic or metal, that hold sockets

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25
Power Question Formulas
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
26
Example Problem To determine the total number of amps needed for 2,500 watts of standard 120-volt line-voltage lighting:
I= W / V I = 2,500/120 I = 20.83 amps
27
Service entrance equipment, interior distribution equipment and loads are all?
Components of building electrical systems
28
What are the 2 electrical systems in most buildings?
Electrical power system Electrical signal or communication system
29
What is the first step electrical engineers do in the electrical system design phase?
Start by making an electrical load estimate
30
Where are controls and protection devices installed at?
Switch-Board
31
What do hot wires do before entering a building?
Go through an electric meter
32
What does the Main disconnect (service) switch do?
Disconnects normal service to the building
33
_____ ______is the maximum volatile that can safely be applied for a unit continuously
Rated Voltage
34
What is a transformer?
Is a device that transforms alternating currents (AC) of one voltage to AC of another voltage.
35
Why would we use a transformer?
When building voltage is difference from the service voltage.
36
What is a switch board?
A large free standing assembly of switches and fuses and/or circuit breakers
37
What is a panel board?
An electrical panel
38
Where are panel boards located?
Surface mounted on solid walls or structural columns
39
What are intelligent panel boards?
Compact, centralized programmable microprocessors
40
Where can’t electrical closets be located?
Should not be located next to stairwells or other main mean of egress
41
What is the space clearance in front of a panel in an electrical closet?
4’
42
What does EMCS stand for?
Energy management control systems
43
What is often the greatest load?
Lighting
44
What are Home runs?
The distance from the first outlet on a circuit to the panel board
45
______ ________ carry the electrical power though out the building to the places it will be used
Branch circuits
46
How is a circuit sized?
The amount of load it must carry with about 20% of its capacity reserved.
47
How limited are branch circuits in length?
Less than 100’
48
Which way should doors to electrical equipment open?
They should open out
49
How often should a convience outlet be provided?
Every 300 s.f
50
how are conductors rated?
They are rated in amps for their capacity to carry current
51
_________ ____________ increases with increasing conductor size and the maximum permissible temperature of 5e insulation protecting the conductor
Conductor Ampacity
52
How is heat generated?
Current flowing though a wire produces resistance which generates heat
53
When current increases what also must increase?
Wire size
54
What does NM stand for?
Romex
55
What does AC also stand for Hint: not he alternating current one
BX armored cable
56
What is a raceway?
Any channel for supporting and protecting conductors
57
What is an open raceway called?
Cable tray
58
The terms _____ and _____ are often used interchanably for assemblies of copper or aluminum bars in a rigid metallic housing
Busway/busduct
59
_____ ______ ______ allow lights, small motors, unit heaters, and other equipment to be served without hard wiring
Flat cable assemblies
60
_____ is required for Fire resistant construction
Conduit
61
What does UFAD stand for?
Underfloor air distribution
62
What does PLC stand for?
Power line carrier systems
63
When placing an outlet on a wall but there is a door in the middle what do you do ?
The receptical would be located within 6’ on either side of it
64
How high above the counter is an outlet located?
20” max
65
How high above the floor is an electrical outlet located?
15” min
66
How high on a wall is a light switch located? And how far from the door?
48” from floor 2.5” from door frame
67
Outlet box, attachment plugs (caps), and wall plates These are all types of?
Wiring Devices
68
What are wiring devices all rated at?
300 amps or less and frequently at 20 amps
69
How are wiring devices classified?
By grades
70
How were junction boxes designed?
To fit within the dimensions of stud walls
71
“A contact device installed at the outlet for connection of a single attachment plug” This is the definition of?
Receptacle
72
The electrical outlets that we plug an electrical cord into is technically known as a _____?
Conveniences receptacle
73
What are 2 receptacles called
A duplex receptacle or duplex outlet
74
A common wall light switch is a type of general duty safety switch called a?
Contractor
75
Electrical devices consume power in standby mode even when turned off or in sleeping mode. This is called?
Vampire Loads

Evironmental Systems for Interior Design (21 decks)

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