Electrical & Mechanical Part 2

26問 • 1年前

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the service entrance conductor in the form of bus bars terminates in the main switchboard and connects to the distribution panel boards by means a feeder circuits protected by circuit breakers. The main switchboard serves for the control, protection and metering of the main feeders

main switchboard

is a set of conductors which extends from the main switchboard to a distributing center (panel board) with no other circuits connected to it between the source and the distributing center

feeder circuits

are line extensions of a feeder, fed through a panel board or cut-out, or from one distributing center to another and having no other circuit connected to it between the two distributing center

sub-feeder circuit

to overhead portion of service conductors extending from the nearest utility pole to a building

service drop

the underground portion of service conductor extending from the main power line or transformation to a building

service lateral

our freestanding assemblies of switches, fuses and circuits breakers that provide switching and feeder protection to a number of circuits connected to the main source

switchboard or switchgear

these are small capacity conductors which deliver energy to lamps, motor and other loads within the circuit

branch circuits

(also called cut-outs) this serve to control and protect the sub-feeders and branch circuits

panel boards and sub-panel boards

the main disconnect for the entire electrical system of a building except for any the emergency power system

service switch

a board on which are mounted the switches,fuse and circuit breakers for controlling protecting a number of similar branch circuit installed in a cabinet and accessible from the front only.

panel

a heavy conductor, usually in the form of a solid copper bar, use for collecting carrying and distributing large electric currents also called a bus bar

bus

any conductor of an electrical system intentionally connected to a ground connection

grounded conductor

a conductor, as a metal ground rod, ground plate of cold water pipe, firmly embedded in the earth to establish a ground connection

grounding electrode

A device containing a strip on wire of fusible metal that melts under the heat produced by current thereby interrupting the circuit

Fuse

A switch that automatically interrupts an electric circuit to prevent excuse current from damaging apparatus in the circuit or from causing a fire

circuit breaker

a conductor connecting electric equipment for a circuit to a ground connection

ground wine

a single panel or group panel limits designed for assembly in the form of a single panel (NEC)

panel board

these are the lighting power and motor loads and wiring devices which are directly handled and utilized by users

utilization equipment

a horizontal single line diagram of the buildings electrical system from the incoming service to the utilization items at the end of the system where the major electrical components are shown as blocks or rectangles

block diagram

single line diagram

when electrical symbols are used in lieu for the blocks, it is called a "one line"

is a vertical line diagram of the major electrical components of the buildings electrical system presented showing the spatial relations between components

riser diagram

which includes conductors and raceways of all types

wirings

transformers switch boards panel boards large switches and circuit breakers

power handling equipment

such as lighting, motors, controls and wiring devices

utilization equipment

provide electric power and illumination essentially for life safety and protection of property during an emergency, such as electricity for exit lighting, elevators, fire alarm systems, fire pumps and the like

emergency system

provide power to selected loads not directly involved with life safety such as waters and sewage

standby system

Building laws Part 1

Mari Alberca · 100問 · 1年前

Building laws Part 1