Shared Flashcard Set

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Electrical Wiring Design
Building Technology V
51
Architecture
Undergraduate 4
10/01/2012

Additional Architecture Flashcards

 


 

Cards

Term
National Fire Protection Association
Definition
NFPA
Term
NFPA 70 and NEC (minimum)
Definition
any design must at least meet what code requirements
Term
  • flexibility
  • reliability
  • safety
  • cost
  • energy
  • space
Definition
Electrical Wiring Design Considerations
Term
expansion
Definition
what is the most imporant part of flexibility?
Term
branch circuitry, feeders, and panels
Definition
what wiring systems should accomodate flexibility?
Term
changing arrangements and location of loads
Definition
what flexibility should wiring systems accommodate?
Term
fixed-purpose facilities
Definition
what type of facilities do not need to be flexible?
Term
electrical demand
Definition
what can you always count on to grow, even if facilities do not?
Term
Reliability
Definition
what is determined by incoming utility service and facility's electrical system?
Term
to determine if standby power is needed
Definition
why would you need to investigate service records?
Term
abuse and misuse of equipment and systems failure
Definition
where do the hazards come into play in electrical systems?
Term
inverse proportion rule-of-thumb
Definition
an inverse relationship between capital cost and life-cycle cost. low cost equipment generally has higher energy and maintenance costs and a shorter life
Term
load-leveling equipment
Definition
what results in a system running near its full load capacity reducing capital and life cycle costs?
Term
equipment size and peak load demand
Definition
what does load-leveling equipment reduce?
Term
AHRAE 90.1
Definition
what sets energy limits based on btu/ft squared/year
Term
hvac, lighting, and electrical distribution systems
Definition
what systems do energy limit codes affect?
Term
panels, motor control centers, busducts, distribution centers, switchboards, transformers
Definition
what parts of the electrical system are large, bulky, noisy, heat producing, and contain safety risks?
Term
  • maintenance needs
  • ventilation
  • expandability
  • access control
  • central location
  • noise issues
Definition
considerations of electrical system design.
Term
an estimate of total facility load
Definition
what is needed at the start of a building design?
Term
transformers, conduit chases, and electrical closets
Definition
what do designers need to plan for ahead of time regarding loads?
Term
  • lighting
  • misc power
  • hvac
  • plumbing
  • mechanical transport equipment
  • kitchen equipment
  • special equipment
Definition
what are the electric loads of a facility?
Term
  • 120/240V, single-phase, 3-wire
  • 120/208V, 3 Phase, 4-wire
  • 277/480, 3 phase, 4-wire
Definition
three most common system voltages
Term
277V
Definition
how much voltage feeds the lighting?
Term
480V
Definition
how much voltage feeds machinery?
Term
120v
Definition
how much voltage is powered by step-down transformers?
Term
480V
Definition
how much voltage feeds lights, computers, accessories, and receptacles?
Term
from smaller feeders and conduits, plus smaller switchgear
Definition
where are the cost savings in large buildings?
Term
  • prevents contact of primary and secondary systems
  • helps locate faults
  • protects from power surges
  • establishes a neutral
Definition
why are most secondary systems grounded?
Term
when a system is grounded at the neutral
Definition
  • must never be able to switch off
  • connected physically to ground at service entry
  • color coded
Term
wiring system to provide a ground path separate from the neutral conductor
Definition
what does the NEC require for grounding?
Term
the grounding of devices
Definition
what is provided by 3-wire plugs
Term
green
Definition
what color is the insulation of ground wiring
Term
ground fault circuit interrupter
Definition
GFI
Term
< 1/2 second
Definition
how fast doees GFi trip?
Term
a device is plugged into the GFCI breaker which can sense the load difference between hot and neutral leg circuits
Definition
how does the GFI work? or GFCI?
Term
  • reduce energy budget
  • select high-efficiency equipment based on life-cycle cost
  • use demand control equipment
  • prodivide individual metering
  • use highest service voltage
Definition
how do you achieve energy conservation?
Term
90%
Definition
how high do you want raise the power factor of equipment?
Term
variable voltage, variable frequency (vvvf)
Definition
what are the most efficient control switches to conserve energy?
Term
electrical resistance heating, electric stoves, hwh, and incandescent lighting
Definition
what items do you not want to use in order to conserve energy?
Term
factors that will conserve energy
Definition

 

Use automatic timers
Seal electric riser shafts (heat loss)
Put electric equip in coolest place possible
Provide for expansion (think about life of bldg)
Use daylighting, energy efficient lighting Use energy efficient vertical transportation
Term
electrical equipment in residential spaces
Definition

 

Typically the service line is overhead and drops down to a meter and fused service switch. Power is fed to a single panel with a main breaker and branch circuit breakers. Sometimes there is an additional sub-panel with its own breakers

Term
electrical equipment for non-residential spaces
Definition
stack panels and electrical closets and try to place them in central locations in the building, typically designed with a service core in the center
Term
  • vertically stacked
  • locked door
  • floor and ceiling slots w/expansion
  • enough wall space to mount equipment
  • room for maintenance
  • good ventilation and lighting
Definition
characteristics of electrical closets
Term
panels, switches, transformers, communication equipment, telephone cabs
Definition
what type of equipment is found in electrical closets?
Term
emergency system
Definition
what by law, should come on within 10 secs after power failure?
Term
fire detection equipment, lighting, alarm, communication systems, elevators, fire pumps, ventilation
Definition
emergency systems are mainly for ...
Term
90 mins
Definition
how long is a battery powered emergency system good for?
Term
2 hours
Definition
how long is a generator powered emergency system good for?
Term
emergency systems
Definition
connected ahead of main disconnect and are separately fused together
Term
20%
Definition
how much should you oversize a conduit system in case of expansion?
Term
lightings, convenience receptacles and appliances
Definition
systems designed and connected to branch circuits
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