Shared Flashcard Set

Details

Electrical System and Materials
Wiring and Raceway
76
Architecture
Undergraduate 4
09/30/2012

Additional Architecture Flashcards

 


 

Cards

Term
national electric code
Definition
nec - defines all things electrical
Term
occupational safety and health act
Definition
OSHA - occupational safety and health act: incorporate the NEC giving it the force of law
Term
Underwriters Laboratories
Definition
UL - sets standards, tests and inspects
Term
no
Definition
does LEED address the issues of electrical system design?
Term
ASHRAE Standard 90.1
Definition
other than _____, codes do not deal much with electrical energy systems efficiency
Term
american society of heating refrigerating and air-conditioning engineers
Definition
ASHRAE
Term
life-cycle costs
Definition
what is the main factor specifying electrical equipment
Term
building energy consumption which has both economic and environmental impacts
Definition
what does the cost of electrical equipment affect
Term
  • exposed insulated cables
  • insulated cables in open raceways (trays)
  • insulated conductors in close raceways
Definition
three types of interior wiring systems
Term
exposed insulated cables
Definition
what cable construction itself provides both necessary insulation and mechanical protection
Term
NM (Romex) and AC (BX)
Definition
types of exposed insulated cables
Term
insulated cables in open raceways
Definition
what cables are carried in open trays which provide most mechanical protection and the cable provides insulation and some mechanical protection
Term
  • buried in structure
  • attached to the structure
  • part of the structure
Definition
name three different installations of raceways
Term
buried in structure
Definition
raceway installation of a conduit in floor slab or underfloor duct
Term
attached to structure
Definition
surface mounted raceways, including suspending above hung ceilings
Term
part of the structure
Definition
installation raceways in cellular concrete or metal floors
Term
the raceways are installed first and then wiring is pulled through later on
Definition
wiring systems installed?
Term
conductors
Definition
means by which electrical current is conducted throughout the electrical system
Term
American Wire Gauge
Definition
AWG wiring standards
Term
wires
Definition
single conductors #8AWG or less are called ___
Term
cables
Definition
#6 or large multiple conductors of any size braided together are called ___
Term
backwards ... the higher the number the thinner the wire. the smaller the number the heavier the wire.
Definition
how do AWG numbers run?
Term
conductor -carrying capacity (ampacity)
Definition
determined by the maximum safe operating temperature of the insulation used on the conductor
Term
conductor ampacity
Definition
wiring selection governed by current - carrying capacity and how the temp. generated affects the insulation
Term
ampacity
Definition
defined as the maximum amount of electrical current a conductor or device can carry before sustaining immediate or progressive deterioration
Term
when conductor size increase and maximum insulation temperature increases
Definition
when does ampacity increase?
Term
open air because temperature is more easily dissipated.
Definition
does amapcity increase more in open air, buried, or conduit systems?
Term
insulation
Definition
both insulates and provides mechanical protection
Term
jackets
Definition
go over insulation and provide greater physical protection
Term
voltage
Definition
what is insulation rated by?
Term
either 300V or 600V
Definition
what is an ordinary building wiring rated at?
Term
copper
Definition
what material are conductors made from?
Term
copper and aluminum conductors
Definition
two material types of conductors
Term
aluminum - they are prone to fire
Definition
which material for conductors should one use with caution and why?
Term
Armored cable (bx)
Definition
has a spiral-wound jacket, used with light metal framing
Term
nonmetalic sheathed cable (romex)
Definition
has a tough plastic sheathing, pulled through holes bored in wood framing; stapled to wood frame construction
Term
busway
Definition
an assembly of copper or aluminum bars in a rigid metallic housing
Term
busways
Definition
used to carry large amounts of current and when tapping in to the conductor frequently is required
Term
cablebus
Definition
round conduit in a busway system
Term
flat bars
Definition
can carry more current than round conductors with smaller cross-section
Term
light-duty busways
Definition
busway concept applied to a track system
Term
track lighting
Definition
an example of light-duty busways
Term
cable trays
Definition
continuous, open support for cables
Term
non-enclosed, higher ampacities, easy to maintin, poor aesthetics
Definition
characteristics of cable trays
Term
raceways
Definition
closed wiring systems
Term
  • power and data needs
  • signaling and communication needs

 

Definition
considerations for raceway systems
Term
  • protect wire from mechanicaland atmospheric damage
  • provide ground in case of short
  • provide system ground path
  • protect surroundings from electrical fire
  • support conductors
Definition
what are the purposes of a conduit
Term
  1. heavy walled (rigid steel conduit)
  2. intermediate metal conduit (IMC)
  3. Thin-walled, electric metalic tubing (emt)
Definition
three tpes of steel conduit
Term
  • easier to bend
  • larger interior diameters
  • weigh much less
Definition
what is the difference between the rigid steel conduit and both the IMC and EMT conduits?
Term
  • more costly material
  • lighter weight
  • labor savings offset cost
  • better corrosion resistance
  • lower voltage drop
Definition
characteristics of aluminum conduit
Term
aluminum conduit system
Definition
what cant be used in concrete or buried in the earth?
Term
spirally wound steel or aluminum
Definition
what are flexible metal conduits made of
Term
flexible metal conduit
Definition
mostly used for motor connections or where vibration is present
Term
non-metal conduit
Definition
requires use of separate ground wire as conduit cant be grounded
Term
surface raceways
Definition
used a lot in remodels and where frequent outlets are required
Term
raceways
Definition
designed for open floor plans (landscape office) where furniture is placed away from walls
Term
  • underfloor duct
  • cellular metal floor raceway
  • precast concrete cellular floor raceway
  • full-access floor
  • under-carpet wiring
  • ceiling raceways and manufactured wiring 
Definition
types of raceways
Term
underfloor duct
Definition
best used when furniture layout is constantly reconfigured
Term
underfloor duct
Definition
raceway that is beneath or flushed with the floor
Term
underfloor duct
Definition
what kind of raceway is used in office spaces
Term
cast into the floor or infill or topping above structural floor
Definition
how are underfloor ducts installed
Term
no
Definition
does an underfloor duct conflict with the structure?
Term
  • expensive
  • inflexible
  • can increase a building height
  • can add 50% to electrical system cost
Definition
what are defaults to an underfloor duct system?
Term
underfloot duct
Definition
raceway that has a combination of ducts and feeders that cross at five foot centers and contain a junction box at the intersection
Term
cellular metal floor raceway
Definition
 floor deck with concrete topping where trench ducts run perpendicular and above cellular systems
Term
great for office landscaping layouts, first costs high but life cycle costs may be lower
Definition
benefits of metal floor raceway
Term
precast concrete cellular floor raceways
Definition

similar to cellular metal floor, but made of concrete

large enough to carry piping and serve for hvac systems

Term
header ducts
Definition
what is required to act as a feed either above the structure or hung below in a precast concrete cellular floor raceway
Term
full-access floor (raised access flooring)
Definition
consists of 18" sq to 36" sq panels on a metal frame held up from the structural floor by posts and increases floor-to-floor heights
Term
full-access floor
Definition
raceway system best used with heavy cablin, frequent re-cabling, and great system for underfloor hvac
Term
under-carpet wiring
Definition
flat cable system, cheap and flexible for new construction
Term
under-carpet wiring
Definition
raceways that use lo-voltage flat cables for signal and communications as well as fiber optic for data
Term
ceiling raceways
Definition
raceways hung in ceiling plenum and feed down to the floor through service poles (not elegent, but cost effective)
Term
  • flexible
  • inexpensive
  • great for commercial and educational use
  • can be metallic or non-metallic
Definition
characteristics of ceiling raceways
Term
manufactured wiring
Definition
refered to as modular branch circuit elements
Term
manufactured wiring
Definition
raceways that connect to fixtures and poles via plug in
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