Term
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Definition
| nec - defines all things electrical |
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Term
| occupational safety and health act |
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Definition
| OSHA - occupational safety and health act: incorporate the NEC giving it the force of law |
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Term
| Underwriters Laboratories |
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Definition
| UL - sets standards, tests and inspects |
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Term
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Definition
| does LEED address the issues of electrical system design? |
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Term
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Definition
| other than _____, codes do not deal much with electrical energy systems efficiency |
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Term
| american society of heating refrigerating and air-conditioning engineers |
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Definition
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Term
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Definition
| what is the main factor specifying electrical equipment |
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Term
| building energy consumption which has both economic and environmental impacts |
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Definition
| what does the cost of electrical equipment affect |
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Term
- exposed insulated cables
- insulated cables in open raceways (trays)
- insulated conductors in close raceways
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Definition
| three types of interior wiring systems |
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Term
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Definition
| what cable construction itself provides both necessary insulation and mechanical protection |
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Term
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Definition
| types of exposed insulated cables |
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Term
| insulated cables in open raceways |
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Definition
| what cables are carried in open trays which provide most mechanical protection and the cable provides insulation and some mechanical protection |
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Term
- buried in structure
- attached to the structure
- part of the structure
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Definition
| name three different installations of raceways |
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Term
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Definition
| raceway installation of a conduit in floor slab or underfloor duct |
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Term
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Definition
| surface mounted raceways, including suspending above hung ceilings |
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Term
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Definition
| installation raceways in cellular concrete or metal floors |
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Term
| the raceways are installed first and then wiring is pulled through later on |
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Definition
| wiring systems installed? |
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Term
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Definition
| means by which electrical current is conducted throughout the electrical system |
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Term
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Definition
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Term
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Definition
| single conductors #8AWG or less are called ___ |
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Term
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Definition
| #6 or large multiple conductors of any size braided together are called ___ |
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Term
| backwards ... the higher the number the thinner the wire. the smaller the number the heavier the wire. |
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Definition
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Term
| conductor -carrying capacity (ampacity) |
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Definition
| determined by the maximum safe operating temperature of the insulation used on the conductor |
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Term
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Definition
| wiring selection governed by current - carrying capacity and how the temp. generated affects the insulation |
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Term
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Definition
| defined as the maximum amount of electrical current a conductor or device can carry before sustaining immediate or progressive deterioration |
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Term
| when conductor size increase and maximum insulation temperature increases |
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Definition
| when does ampacity increase? |
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Term
| open air because temperature is more easily dissipated. |
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Definition
| does amapcity increase more in open air, buried, or conduit systems? |
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Term
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Definition
| both insulates and provides mechanical protection |
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Term
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Definition
| go over insulation and provide greater physical protection |
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Term
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Definition
| what is insulation rated by? |
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Term
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Definition
| what is an ordinary building wiring rated at? |
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Term
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Definition
| what material are conductors made from? |
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Term
| copper and aluminum conductors |
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Definition
| two material types of conductors |
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Term
| aluminum - they are prone to fire |
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Definition
| which material for conductors should one use with caution and why? |
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Term
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Definition
| has a spiral-wound jacket, used with light metal framing |
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Term
| nonmetalic sheathed cable (romex) |
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Definition
| has a tough plastic sheathing, pulled through holes bored in wood framing; stapled to wood frame construction |
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Term
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Definition
| an assembly of copper or aluminum bars in a rigid metallic housing |
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Term
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Definition
| used to carry large amounts of current and when tapping in to the conductor frequently is required |
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Term
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Definition
| round conduit in a busway system |
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Term
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Definition
| can carry more current than round conductors with smaller cross-section |
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Term
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Definition
| busway concept applied to a track system |
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Term
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Definition
| an example of light-duty busways |
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Term
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Definition
| continuous, open support for cables |
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Term
| non-enclosed, higher ampacities, easy to maintin, poor aesthetics |
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Definition
| characteristics of cable trays |
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Term
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Definition
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Term
- power and data needs
- signaling and communication needs
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Definition
| considerations for raceway systems |
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Term
- protect wire from mechanicaland atmospheric damage
- provide ground in case of short
- provide system ground path
- protect surroundings from electrical fire
- support conductors
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Definition
| what are the purposes of a conduit |
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Term
- heavy walled (rigid steel conduit)
- intermediate metal conduit (IMC)
- Thin-walled, electric metalic tubing (emt)
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Definition
| three tpes of steel conduit |
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Term
- easier to bend
- larger interior diameters
- weigh much less
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Definition
| what is the difference between the rigid steel conduit and both the IMC and EMT conduits? |
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Term
- more costly material
- lighter weight
- labor savings offset cost
- better corrosion resistance
- lower voltage drop
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Definition
| characteristics of aluminum conduit |
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Term
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Definition
| what cant be used in concrete or buried in the earth? |
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Term
| spirally wound steel or aluminum |
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Definition
| what are flexible metal conduits made of |
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Term
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Definition
| mostly used for motor connections or where vibration is present |
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Term
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Definition
| requires use of separate ground wire as conduit cant be grounded |
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Term
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Definition
| used a lot in remodels and where frequent outlets are required |
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Term
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Definition
| designed for open floor plans (landscape office) where furniture is placed away from walls |
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Term
- underfloor duct
- cellular metal floor raceway
- precast concrete cellular floor raceway
- full-access floor
- under-carpet wiring
- ceiling raceways and manufactured wiring
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Definition
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Term
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Definition
| best used when furniture layout is constantly reconfigured |
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Term
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Definition
| raceway that is beneath or flushed with the floor |
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Term
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Definition
| what kind of raceway is used in office spaces |
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Term
| cast into the floor or infill or topping above structural floor |
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Definition
| how are underfloor ducts installed |
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Term
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Definition
| does an underfloor duct conflict with the structure? |
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Term
- expensive
- inflexible
- can increase a building height
- can add 50% to electrical system cost
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Definition
| what are defaults to an underfloor duct system? |
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Term
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Definition
| raceway that has a combination of ducts and feeders that cross at five foot centers and contain a junction box at the intersection |
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Term
| cellular metal floor raceway |
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Definition
| floor deck with concrete topping where trench ducts run perpendicular and above cellular systems |
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Term
| great for office landscaping layouts, first costs high but life cycle costs may be lower |
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Definition
| benefits of metal floor raceway |
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Term
| precast concrete cellular floor raceways |
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Definition
similar to cellular metal floor, but made of concrete
large enough to carry piping and serve for hvac systems |
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Term
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Definition
| what is required to act as a feed either above the structure or hung below in a precast concrete cellular floor raceway |
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Term
| full-access floor (raised access flooring) |
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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 |
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Term
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Definition
| raceway system best used with heavy cablin, frequent re-cabling, and great system for underfloor hvac |
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Term
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Definition
| flat cable system, cheap and flexible for new construction |
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Term
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Definition
| raceways that use lo-voltage flat cables for signal and communications as well as fiber optic for data |
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Term
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Definition
| raceways hung in ceiling plenum and feed down to the floor through service poles (not elegent, but cost effective) |
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Term
- flexible
- inexpensive
- great for commercial and educational use
- can be metallic or non-metallic
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Definition
| characteristics of ceiling raceways |
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Term
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Definition
| refered to as modular branch circuit elements |
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Term
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Definition
| raceways that connect to fixtures and poles via plug in |
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