PEC chapter 3 and 4 part 2
12
A 2400 volt lead cable can be bent up to ____ times its diameter.
secondary tie
A ___ is a circuit operating at 600 volts, nominal, or less, between phases that connects two power sources or power supply point, such as the secondaries of two transformers.
warning signs
A _____ is permanently located on the outside of each equipment enclosure door or cover permitting access to the live parts in the motor control circuit(s), warning that motor control circuit disconnecting means are remotely located and specifying the location and identification of each disconnect
115
A disconnecting means serving a hermetic refrigerant motor compressor selected on the basis of the nameplate rated load current or branch circuit selection current, whichever is greater shall have an ampere rating of __% of the nameplate rated load current or branch circuit selection current
0.75mm2
A fixture rated at 6 amps requires a size ____ minimum fixture wire.
trees
A lighting fixture installed outdoors is permitted to be supported by
lighting track
A manufactured assembly designed to support and energizelighting fixtures that are capable of being readily repositioned is ___
250%
A phase converter is usually employed to convert single- phase to three- phase power supply so that three- phase motors maybe used. For this service, the PEC specifies that the single - phase conductors shall have an ampacity of NOT less than ___ of the full load current rating of motor or load being served where the input and the output voltages are identical.
one over eight
A portable motor which has an attachment plug and receptacle may use this type of attachment as the controller provided the motor does not exceed ____ hp.
4
A run conduit between outlets, between fittings, between outlet and fitting shall not contain more than the equivalent of ___ quarter-bends.
300
A thermal barrier shall be required if the space between the resistors and reactors and any conductor would be ___ mm and below.
80A
A three- phase general purpose squirrel cage motor draws a full load current of 40 A. What is the maximum size of time delay fuse that may be used for short circuit protection?
header
A transverse metal raceway for electric conductors, furnishing access to predetermined cells of a precast cellular concrete floor,which permits installation of conductors from a distribution center to the floor cells, is called ____.
MV
A type of cable which is a single or multi- conductor solid dielectric insulated cable rated 2001 volts or
20
Alkali-type battery cells in jars of conductive material shall be installed in trays of nonconductive material with not more than ____ 24 volt cells in the series circuit in any one tray
in the field
All heating elements that are replaceable ____ and are a part of an electric heater shall be legibly marked with the rating in volts and watts, or in volts and amperes
I,II and III
All types FCC cable connections shall use connections identified for their use, installed such that ___ against dampness and liquid spillage are provided.l. electrical continuityll. insulationlll. sealing
steel electrical metallic tubing
Aluminum fittings and enclosures shall be permitted to be used with ____where not subject to severe corrosive influences.
metal wireways
Are rectangular sheet metal enclosures equipped with removable covers providing access to conductors inside?
125%
Branch circuit conductors supplying a single motor shall have an ampacity in terms of the full load current of NOT less than
installation,connection,maintenance
Busways rated over 600 volts shall have all conductor termination and connection hardware accessible for ____.
No overcurrent devices are installed on the busway other than for an individual fixture
Busways shall be permitted to be installed being panels if means of access are provided and if the conditions below are met. One of them is NOT valid. Which one of this?
hoistways
Cable tray system shall not be used in ____ or where subject to severe physical damage
1400mm
Concealed knob and tube wiring conductors shall be rigidly supported on knobs not more than a certain minimum distance apart. What is this distance?
900mm
Conductors must have a clearance from windows, porches, fire escapes of NOT less than
flat conductor cable
Consists of three or more flat copper conductor placed edge to edge separated and enclosed within an insulating assembly.
where protected from corrosion solely enamel
EMT shall not be used ____
I and II only
Examples of resistance heaters are ____l. heating blankets ll. heating tape lll. heating barrel
cleat type located at least 2400mm above the floor
Fixtures or lampholders should have no live parts normally exposed to contact unless they are ___.
90
Fixtures shall be so constructed that adjacent combustible material will not be subject to temperature in excess of ____ degrees C.
temperature,voltage,current
Fixtures shall be wired with conductors having insulation suitable for the environment conditions and ___ to which the conductors will be subjected
damp locations
Flat conductor cable (FCC) system shall NOT be used in the locations enumerated below EXCEPT one. Which one is this
In wet locations
Flat conductor cables may be installed in any of the following location EXCEPT one. Which one is this?
d
Flexible metal conduits must not be used in a. wet locations b. hoistways c. storage battery rooms d. all of these
the current at which the motor overload device is selected to trip
For over 600v, the motor branch circuit conductors shall have an ampacity not less than _____
8 times
For raceway 20 mm trade size or larger containing conductors 22 mm2 or larger, the minimum length of the box in straight pulls shall NOT be less than_______ the trade diameter of the largest raceway
25 amps
If a 3.5 sq mm wire will safely carry 25 amps at 120 volts, what will it carry at 240 volts?
one over eight
If a switch or circuit breaker serves as the disconnecting means for a permanently connected motor driven appliance of more than ___ horsepower, it shall be located within sight from the motor controller
300V
In general, the voltage limitation between conductors in a surface metal raceway is ____.
6mm
In indoor wet locations, the entire wiring system including all boxes, fittings, control boards and panel boards shall be installed on walls with a minimum clearance. What is this clearance?
19.1
In panelboards, where the voltage on busbars is 250 volts and the bars are opposite polarity, held free in air, the minimum spacing between the parts is ____mm
3000mm
In rigid metal wiring conduit, conduits shall be supported at least every
15mm
In wiring using rigid metal conduits, conduit smaller than ____ shall not be used.
are used only as isolating switches
Knife switches rated for more than 1200 amperes at 250 volts ____.
50
Live parts of generators operated at more than ___ volts to ground shall not be exposed to accidental contact where accessible to unqualified persons.
Where exposed to direct sunlight
Medium voltage cable shall be permitted for installation on the following EXCEPT?
direct burial on earth
Metal clad cables shall be permitted for installations in the following locations EXCEPT one. Which one is this?
75
Metal surface raceways having splices and taps shall be permitted as long as the splices and taps and conductors do not fill the raceway more than ____ percent of the area of the raceway at that point
electric signals
Motor control circuit is the circuit of a control apparatus or system that carries the _____ directing the performance of the controller but does not carry the main power current.
dry location
Multi-outlet assembly may be used in
900,2400
No parts of pendants shall be located within a zone measured ____ mm horizontally and ____ mm vertically from the top of the bathtub rim.
1650
Non- metallic boxes not over ____ cu. Cm shall be permitted only on non-metallic wiring method.
Where installed in industrial establishment where a registered master electrician will service the installation
Power and control tray cables (type TC) maybe used under one of the following conditions. Which one is this?
305mm
Resistors and reactors shall not be installed in close proximity to combustible materials such that it constitutes a fire hazard. What minimum clearance is required by the Code?
corrosion protection
Rigid metal conduit shall be permitted to be installed in concrete, in direct contact with the earth or in areas subject to severe influences where protected by ____ and judged suitable for the condition.
appliance
SE cable used to supply ____ shall not be subjected to conductor temperature is excess of the temperature specified for the type of insulation involved
1800
Separation of junction box from motor shall be permitted to be separated from the motor not more than _____mm.
20
Several motors, each not exceeding 1 horsepower in rating, shall be permitted on a nominal 115 volt branch circuit protected at not over ____ amperes.
excessive movement
Single conductors in a cable tray shall be securely bound in circuit groups to prevent ____ due to fault-current magnetic forces unless single conductors are cabled together, such as triplexed assemblies.
ozone resistant
Solid dielectric insulated conductors operated above 2000 volts in permanent installations shall have ___ insulation and shall be shielded
75
Splices and taps shall be permitted in surface nonmetallic raceways having a removable cover that is accessible after installation. The conductors, including splices and taps, shall not fill the raceway to more than ___ percent of its area at that point.
75
Splices and taps shall be permitted within a wireway provided they are accessible. The conductor including splices and taps shall not fill the wireway to more than ___ percent of its area at that point
23
The ampacity of a single 3.5mm2fixture wire is ____ amps
900mm
The clearance from the top of a switchboard to a ceiling which is combustible shall NOT be less than ____.
1.35mm
The construction of metal cabinet and cutout boxes shall be such as to secure strength and rigidity. If constructed of uncoated sheet steel, the metal thickness should NOT be less than
91
The disconnecting means for a 50 hp three-phase 460v induction motor shall have an ampere rating of at least ____ amps.
115%
The disconnecting means of a hermetic-type refrigerator compressor shall have an ampacity of at least ____ of the nameplate full load current
100mm
The largest size of electrical metallic tubing is
voltage
The lead wires of heating cables are color coded for ___ identification.
125%
The maximum percent of overcurrent protection allowed is ____ of the input current to an autotransformer when less than 9 amps.
100mm
The maximum size of liquid light flexible metal conduit shall be ___ electrical raceway size.
150mm
The maximum size of liquid tight flexible metal conduit shall be ___ trade size
35 amps
The minimum ampacity of wire for 10 hp, 3-phase, 220 volt motor should be:
I,II and III
The overall covering of UF cable shall be ____.l. suitable for direct burial in the earth ll. flame-retardantlll. moisture, fungus and corrosion resistant
as low as practicable
The rating of an over-current device for a capacitor shall be ____
50
The residual voltage of a capacitor shall be reduced to ___ volts, nominal, or less with 1 minute after the capacitor is disconnected from the source of supply
50%
The sum of the cross-sectional areas of all contained conductors at any cross section of a sheet metal auxiliary gutter shall not exceed to the percentage of the interior cross-sectional area of the sheet metal auxiliary gutter. What is this percentage
20%
The sum of the cross-sectional areas of all contained conductors at any cross section of a wireway shallnot exceed _____ of the interior cross sectional area of the wireway.
In dry locations
The surface non- metallic raceway may NOT be used in the following locations EXCEPT one. Which one is this
Ferrous metal conduits shall be permitted to be installed in concrete
The used of rigid metal conduits shall be permitted under all atmospheric conditions subject to the following conditions EXCEPT one. Which one is this?
directly on the surface of wall
The uses of non- metallic extensions are NOT allowed in all but one of the following. Which one is this?
armored cable
This type of cable is a fabricated assembly of insulated conductors enclosed in a flexible metal sheath.
at stand still
Torque motors are rated for operation ____
3
Transformer vaults shall have adequate structural strength and a minimum fire resistance of at least ____ hours. Unless protected by automatic sprinklers.
300
Transformers over 112 1,2 kva shall not be within ___ mm of combustible material.
360 degrees
What is the total number of mechanical degrees that a PVC conduit run maybe bent between pull joints (pull boxes, junction boxes or utility boxes)
locked
When a controller is not within sight from the motor location the disconnect shall be capable of being ___ in the open position.
shall be removed from the raceway
When an outlet from an under-floor raceway is discontinued, the circuit conductors supplying the outlet ____.
25
When calculating the conductor fill for strut-type channel raceway with internal joiners, the raceway shall be permitted to be filled to ___ percent of the cross-sectional area.
the total number of current carrying conductors in the cable
When derating the ampacity of multiconductor cables to be installed in cable tray, the ampacity duration shall be based on ___
30mm
When installing cables or raceways type wiring method parallel to the framing members such as joists, rafters or studs, the cable or raceway shall be installed and supported so that the nearest outside surface of the cable or raceway is NOT less than a certain distance from the nearest edge of the framing member. What is this distance?
integrated mechanical
Where a double-throw knife switch has a vertical throw, ___ means shall be provided to hold the blades in the open position when so set.
150degC
Where a fixture is recessed in fire resistant material in a building of fire resistant construction, a temperature not higher than ___ shall be considered acceptable if the fixture is plainly marked that it is listed for that service.
15 amp at 125V
Where a motor is connected to a branch circuit by means of an attachment plug and receptacle and individual overload protection is omitted, the rating of the attachment plug and receptacle shall not exceed ____ or 250 volts.
I,II,III and IV
Where fluorescent lighting fixtures are supported independently of the outlet box, they shall be connected by metal raceways, nonmetallic raceways or ____ may be used. I. nonmetallic sheathed cable II. MI cable III. AC cable IV. MC cable
sealed
Where raceways are exposed to widely different temperatures they shall be ___.
may have an ampacity less than specified if acceptable to the authority having jurisdiction
Where reduced heating of the conductors results from motors operating on duty-cycle, intermittently, or from all motors not operating at one time, the feeder conductors ___.
grounded phase
Where single phase loads are connected on the load side of a phase converter, they shall not be connected to the ___
250mm
Where the conduits enter a switchboard at the bottom, a sufficient space shall be provided to permit installation of the conductors in the enclosure. The minimum spacing between the bottom of the enclosure and the non-insulated bus bar shall be ___
250mm
Where the conduits enter a switchboard at the bottom, a sufficient space shall be provided to permit installation of the conductors in the enclosure. The minimum spacing between the bottom of the enclosure and the non-insulated bus bar shall be ____.
watts
Which of the following is not required on a motor nameplate
surface-type snap switches do not need boxes
Which of the following is/are correct about open wire systems on insulators?
it may be used in any hazardous location
Which of the following statements about MI cable is correct?
Metal fixtures and enclosures rated at 250 V and installed up in the ceiling shall be grounded
Which of the following statements on lighting fixtures NOT correct?
rigid non-metallic conduit
Which of the raceway methods is NOT allowed to be used in a hazardous location
Flat conductor cable
Wirings allowed to be installed outside buildings are enumerated below EXCEPT one. Which one is this
flat conductor cable
Wirings allowed to be installed outside buildings are enumerated below EXCEPT one. Which one is this
Wood plug and nail
an outlet box should be fastened to a concrete wall by the use of
