industrial study(1,2,4)

concrete incasement of raceways

12 in

3 phase windings are ___ apart.

120 degrees

fuse protection for transformers rated 1,000 volts or less current is less than 9 amps - set to no more than

167% of its value

most lightning standards required installation of

concrete base

plug- in busway fittings are _____ & ______

engineer and layed out well

fuse voltage ratings 2400 volts & up

true

for junction boxes and pulls

manholes

another term for pothead

stress cone

1/2 " conduit

7/8 " hole

high voltage fuses rating N or E

True

in industrial everything is 3-phase

True

maximum rating of over-current devices for transformers rated 1000 volts or higher ( 450.3(A) )

True

power or distribution panelboards can feed transformers

True

LIGHTNING ARRESTER

Protective device for limitting surge voltage on equipment by discharging or by-passing surge current

disconnect attached for busway system

circuit breaker cubicle

can adjust taps to

compensate voltage

Grounding

connecting an object to a large body, like Earth, that is capable of effectively removing an electric charge that the object might have ; connecting a circuit to a common point of reference

are given on the site plan to indicate the existing and new grading levels

contour lines

strain relief cord grip are used in

cord drop

for plug-in ducts torque or _______.

double torque

_________ replaces large conduit wire rated more or at 1,000 amps

feeder busways

methods of connecting paneboards ___ or _____ based on the _____ ( tap boxes )

feeder through lugs, double lugs , load

panelboards have access from the ____ and switchboard have access from the ____.

front, back

Delta delta will produce a ___

high leg

unlimited license used to work on

high voltage

input, transformer, output

high voltage, transformer, low voltage

the level of the lower edge of a conduit entering the manhole

invert elevation (INV)

fittings for feeder bus systems are ______ & ______ ( elbow, flat tee)

layed out and order

where lightning storm strikes ; provides low-impedance to ground

lightning arrester

underground raceways terminate in underground

manholes

TAPS not over 10FT long; ampacity of tap conductors is not less than _______ of the overcurrent device protecting the feeder conductors.

one-tenth ( 1/10)

TAPS not over 25FT long; ampacity of tap conductors is at least than _______ overcurrent device protecting the feeder conductors.

one-third ( 1/3)

can be installed directly in the soil

rigid metal conduit

open delta with ground will produce both ___ & ___. (usually out power 240 V)

singles phase and 3 phase

the connecting must be made in the _____ of each of the panelboard

subfeeder

the panelboard shall have a rating not less than _________.

the minimum feeder capacity

pothead

to terminate high voltage cables

plug-in ducts are to be properly ______ in a good manner

torque

getting power to places you need

trolley busway

busbar enclosed in ________ ducts ( busway, bus duct)

ventilated

Line current and phase current are the same in the _____ configuration.

wye

phase voltage is less than the line voltage by a factor of square root of 3 ( 1.732)

wye

taps provide ____ changes above/ below standard voltages.

2 1/2 %

panelboards available rating

225, 400, 600, 800, 1200 amps

for direct burial cables, minimum burial depth

24 inch

breakers usually rated at ____ or ____ volts

250, 600 volts

fuse protection for transformers rated 1,000 volts or less current is less than 2 amps - set no more than

300 % of its value

AIC

Ampere Interrupting Capacity

rating of the panelboard is determine by the ____

buses

panelboards with more than ____ of its overcurrent devices are rated at 30 amps or less, neutral connection provided are called ____ .

10 % , lightning panelboards

Most common type of connection is

Delta Delta

low impedance symbol

Z

substation

a set of equipment reducing the high voltage of electrical power transmission to that suitable for supply to consumers.

bonding

all metal parts connected, electrical continuity

is a reference point from which all elevations are located.

benchmark (BM)

the trip rating of the circuit breaker cannot exceed the ampacity of the ____ in the panelboard

busbar

Line voltage and phase voltage are the same in the _____ connection.

delta

the phase current is less than the line current by a factor of square root of 3 ( 1.732)

delta

panelboard must be protected using an protective device with a trip setting not exceeding the rating of the ____

panelboard