Term
National Fire Protection Association |
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Definition
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Term
NFPA 70 and NEC (minimum) |
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Definition
any design must at least meet what code requirements |
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Term
- flexibility
- reliability
- safety
- cost
- energy
- space
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Definition
Electrical Wiring Design Considerations |
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Term
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Definition
what is the most imporant part of flexibility? |
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Term
branch circuitry, feeders, and panels |
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Definition
what wiring systems should accomodate flexibility? |
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Term
changing arrangements and location of loads |
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Definition
what flexibility should wiring systems accommodate? |
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Term
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Definition
what type of facilities do not need to be flexible? |
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Term
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Definition
what can you always count on to grow, even if facilities do not? |
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Term
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Definition
what is determined by incoming utility service and facility's electrical system? |
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Term
to determine if standby power is needed |
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Definition
why would you need to investigate service records? |
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Term
abuse and misuse of equipment and systems failure |
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Definition
where do the hazards come into play in electrical systems? |
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Term
inverse proportion rule-of-thumb |
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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 |
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Term
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Definition
what results in a system running near its full load capacity reducing capital and life cycle costs? |
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Term
equipment size and peak load demand |
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Definition
what does load-leveling equipment reduce? |
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Term
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Definition
what sets energy limits based on btu/ft squared/year |
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Term
hvac, lighting, and electrical distribution systems |
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Definition
what systems do energy limit codes affect? |
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Term
panels, motor control centers, busducts, distribution centers, switchboards, transformers |
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Definition
what parts of the electrical system are large, bulky, noisy, heat producing, and contain safety risks? |
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Term
- maintenance needs
- ventilation
- expandability
- access control
- central location
- noise issues
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Definition
considerations of electrical system design. |
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Term
an estimate of total facility load |
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Definition
what is needed at the start of a building design? |
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Term
transformers, conduit chases, and electrical closets |
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Definition
what do designers need to plan for ahead of time regarding loads? |
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Term
- lighting
- misc power
- hvac
- plumbing
- mechanical transport equipment
- kitchen equipment
- special equipment
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Definition
what are the electric loads of a facility? |
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Term
- 120/240V, single-phase, 3-wire
- 120/208V, 3 Phase, 4-wire
- 277/480, 3 phase, 4-wire
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Definition
three most common system voltages |
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Term
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Definition
how much voltage feeds the lighting? |
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Term
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Definition
how much voltage feeds machinery? |
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Term
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Definition
how much voltage is powered by step-down transformers? |
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Term
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Definition
how much voltage feeds lights, computers, accessories, and receptacles? |
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Term
from smaller feeders and conduits, plus smaller switchgear |
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Definition
where are the cost savings in large buildings? |
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Term
- prevents contact of primary and secondary systems
- helps locate faults
- protects from power surges
- establishes a neutral
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Definition
why are most secondary systems grounded? |
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Term
when a system is grounded at the neutral |
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Definition
- must never be able to switch off
- connected physically to ground at service entry
- color coded
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Term
wiring system to provide a ground path separate from the neutral conductor |
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Definition
what does the NEC require for grounding? |
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Term
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Definition
what is provided by 3-wire plugs |
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Term
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Definition
what color is the insulation of ground wiring |
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Term
ground fault circuit interrupter |
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Definition
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Term
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Definition
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Term
a device is plugged into the GFCI breaker which can sense the load difference between hot and neutral leg circuits |
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Definition
how does the GFI work? or GFCI? |
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Term
- reduce energy budget
- select high-efficiency equipment based on life-cycle cost
- use demand control equipment
- prodivide individual metering
- use highest service voltage
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Definition
how do you achieve energy conservation? |
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Term
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Definition
how high do you want raise the power factor of equipment? |
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Term
variable voltage, variable frequency (vvvf) |
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Definition
what are the most efficient control switches to conserve energy? |
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Term
electrical resistance heating, electric stoves, hwh, and incandescent lighting |
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Definition
what items do you not want to use in order to conserve energy? |
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Term
factors that will conserve energy |
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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 |
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Term
electrical equipment in residential spaces |
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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 |
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Term
electrical equipment for non-residential spaces |
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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 |
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Term
- vertically stacked
- locked door
- floor and ceiling slots w/expansion
- enough wall space to mount equipment
- room for maintenance
- good ventilation and lighting
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Definition
characteristics of electrical closets |
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Term
panels, switches, transformers, communication equipment, telephone cabs |
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Definition
what type of equipment is found in electrical closets? |
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Term
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Definition
what by law, should come on within 10 secs after power failure? |
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Term
fire detection equipment, lighting, alarm, communication systems, elevators, fire pumps, ventilation |
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Definition
emergency systems are mainly for ... |
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Term
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Definition
how long is a battery powered emergency system good for? |
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Term
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Definition
how long is a generator powered emergency system good for? |
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Term
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Definition
connected ahead of main disconnect and are separately fused together |
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Term
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Definition
how much should you oversize a conduit system in case of expansion? |
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Term
lightings, convenience receptacles and appliances |
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Definition
systems designed and connected to branch circuits |
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