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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