Flashcards in PEC 6 Deck (151):
For non-dwelling receptacle loads, the demand factor for the first 10 kVA or less shall be ___%.
In each conduit run entering an enclosure for switches, circuit breakers, relays and others that may produce high temperatures, seals on the conduit shall be installed within _______`(mm) length before entering the enclosure.
The ampacity of the conductors can be derated at most, _ times.
In the schedule of loads for lighting, which of the following contents is NOT necessary?
Protective device rating
Panel as numbered in the feeder diagram
Number of lighting outlets per circuit
If potential exceeding ___V are employed, a permanent warning sign shall be displayed.
is a load where maximum current is expected to continue for 3 hours or more. (April 2016)
Communication conductors shall NOT be smaller than (mm2)
Receptacle and attachment plugs shall be permitted to be of lower ampere rating than the branch circuit but NOT less than ___% of the fixture full load current
A wye-delta starter for a single voltage three phase squirrel cage induction motor would require the connection of _____ from the motor.
At least (_) receptacle outlet shall be installed outdoors for a one family dwelling unit.
is the maximum permitted load of a 15 A branch circuit. (A)
Note: Load permitted shall NOT exceed 80% of the branch circuit rating
Where a feeder supplies continuous load or any combination of continuous and non-continuous load. The rating of the over-current device shall NOT be less than the non-continuous load plus ____% of the continuous load.
Faceplates of insulating material shall be non-combustible and NOT less than _____(mm) in thickness.
For raceway ____(mm) trade size or larger containing conductors _____(mm2) or larger, the minimum length of the box in straight pulls shall NOT be less than _____ the trade diameter of the largest raceway.
Type MC cable shall NOT be used (3)
Where exposed to corrosive materials
As direct burial to earth
Where exposed to cinder fills
Using aluminum or copper clad aluminum conductors, the minimum size of service entrance conductors shall be ______(mm2).
Ground counterpoise conductor shall be soft copper wire NOT smaller than ____(mm2)
The disconnecting means for motor circuits rated up to ______V, shall have an ampere rating of at least ___% of the full load current of the motor.
How many amperes will a 100 A circuit breaker hold before tripping open the circuit? (use rule of thumb).
Ans. 300 A
is a device for transferring one or more load conductor connections from one power source to another.
. For an AC transformer and DC rectifier arc welder having a time rating of one hour, the supply conductors shall NOT be less than ____% of its rated primary nameplate current.
refers to the power plant mounted on wheels as used in the railroad transportation industry.
If the terminal of the equipment grounding conductor is not visible, the conductor entrance hole shall be marked with the word “_______”.
Type NMC (non-metallic sheathed cable) shall have an outer covering which has the following characteristics. Which one is NOT included?
None of these
None of these
________ maybe used where installed in industrial establishment where a registered master electrician will service the installation.
Power and control tray cables (type TC)
Where rear access is required to work on de-energized parts on the back of enclosed equipment, a minimum working space of _______(mm) horizontally shall be provided.
A one family dwelling unit shall have a disconnecting means of at least ___A where the initial computed load is 10 kVA or more.
Large batteries are those connected to a charging device with an output of more than ___kw
is a component of a DC motor which is used to control the speed.
Switches used in watercrafts, shall be capable of breaking and making safely a load current equal to ____% of their rated current at the rated voltage.
is a wiring method using knobs, tubes, and flexible non-metallic tubing for the protection and support of single insulated conductors concealed in hollow spaces of walls and ceilings of buildings.
Concealed knob and tube wiring
The ampacity of the branch circuit conductors and the rating or setting of over-current protective devices supplying fixed electric space heating equipment consisting of resistance elements with or without a motor shall NOT be less than ___% of the total load of the motors and the heaters
Both _____(2) is a repulsion motor equipped.
commutator and slip ring
Communication conductors shall have a vertical clearance of NOT less than _____(mm) from all points of roofs above, which they pass.
______ is a luminous discharge due to ionization of the air surrounding a conductor caused by a voltage gradient exceeding a certain critical value.
___________ is a branch circuit that supplies a number of outlets for lighting and appliance.
General purpose branch circuit
The minimum number of branch circuits shall be determined from the __________________________
total computed load and the rating of the circuits used.
The insulated conductor of type TC (cable tray) cable shall be in sizes _____(mm2) through _______(mm2) copper.
A motor-generator arc welder has a 70% duty cycle, the supply conductors shall NOT be less than ___ of its rated primary nameplate current.
A frequency meter is connected as a potential device, which is connected across the line because of the : ____________________
reading will be independent of the varying current.
Rigid non-metallic conduit approved for direct burial without concrete encasement shall have a minimum burial of _______(mm).
All metal parts associated with the hot tub shall be bonded using copper bonding jumper, insulated, covered, or bare, NOT smaller than ___(mm2).
All lighting fixtures, submersible pumps and other submersible equipment used in fountains shall operate at ____V or less between conductors.
The ____________ when installed in earth shall be placed _____ (mm) above all cable in a trench.
Type FCC cable shall NOT be used in any of the following EXCEPT
The ampacity of the conductors and the rating or setting of over-current devices in a circuit of a __________ shall NOT be less than ___% of the computed current.
solar photovoltaic system
For signaling circuits NOT exceeding ____V the current required shall NOT exceed _ A.
The grounding electrode shall be
The nearest available effectively grounded structural metal member of the structure.
The nearest available effectively grounded metal water pipe
The nearest concrete encased electrode
Non-metallic boxes NOT over________cm3 shall be permitted only on non-metallic wiring method.
The equipment bonding jumper (the connection between the equipment grounding conductor and the grounding impedance) shall be an ________ conductor run.
According to its make, conduits maybe classified as
In no case shall the grounding conductor be smaller than _____(mm2) copper.
________ – Hazardous location in which flammable gases or vapors are present in the air in quantities sufficient to produce explosives or ignitable mixtures.
The system neutral conductor shall NOT be connected to ground, EXCEPT through the ___________
neutral grounding impedance.
In a damp or wet locations, cabinets and cutout boxes of the surface type shall be mounted with at least _________(mm) air space between the enclosure and the wall.
. The minimum diameter of a solid air terminal under class I material requirements shall be _____ for copper and_____ for aluminum.
. Circuits with a nominal voltage of 600 V or less in a rigid metal conduit or intermediate metal conduit and placed in a trench below a _____(mm) thick ______(mm) or equivalent shall maintain a minimum cover distance of ________.
50 mm . concrete
Vertical clearances of all service drop conductors above roofs shall NOT be less than _______(mm)
The lightning conductor or ground terminal shall extend vertically NOT less than______(mm) into earth.
The circuit supplying an ________ type dimmer shall NOT exceed _____V between conductors.
is a spark occurring between nearby metallic objects or from such objects to the lightning protection system or to ground.
Covers for boxes shall be permanently marked. The marking shall be on the outside of the box using the block type letters at least _____(mm) in height.
When wiring a raceway at least ______(mm) of free conductors shall be left at each outlet.
Where a rigid metal conduit is used, there shall NOT be more than the equivalent of _______ between pull points.
4 quarter bends
There shall be at least _____ on a heavy-duty smoke or vent stacks.
2 down conductors
If the setting of the over-current device in a circuit ahead of the equipment is 60 A, the minimum equipment grounding conductor using copper shall be _______(mm2)
is an exposed wiring support system using a messenger wire to support insulated conductors.
Messenger supported wiring
Air terminal shall be within ______(mm) of outermost projection of roof edge.
In replacing a busted fuse which of the following is important?
Ans. same size and type
________ have 75-ohm impedance.
Rigid metal conduit shall be shipped in standard lengths of ____(mm)
is the term given to an insulated stranded wire.
Exposed non-current carrying metal parts of fixed equipment likely to become energized shall be grounded under the following conditions. Which one is NOT included?
Where located in wet or damp locations
Where in electrical contact with wooden floor
Where in a classified hazardous locations
Where supplied With a metal raceway or other wiring methods
Where in electrical contact with wooden floor
Electrical equipment except x-ray tube inside anesthetizing room shall be located at least
_____(mm) above the floor.
Where the distance requirement in making holes cannot be maintained, the _______ shall be protected from penetration by __________________
at least _______(mm) thick and of approved length and width to cover the area of the winding.
cable or raceway
screws or nails by a steel plate of bushings
The entire area of the aircraft hangar, including any adjacent communication areas not
suitably cut-off from the hangar shall be classified as hazardous up to a level of _____(mm) above the floor.
In which method of starting a motor is the starting current a minimum?
All switches and circuit breakers used as switches shall be so installed that the center of
the grip of the operating handle when in i ts highest position shall NOT be more than ______(mm) above the floor or working flatform.
For straight pulls, the length of the pull box shall NOT be less than ___ times the outside
diameter of the largest non-shielded conductor or cable.
____________ shall NOT be permitted to be used.
Electrical non-metallic tubing shall be clearly and durably marked at least every _____(mm)
Which of the fol lowing sizes of fuse is NOT standard?
(80 A, 45 A, 125 A, 75 A)
The PEC, Part _ does not cover wiring of equipment installed within ______.
is the smallest electrical trade size of intermediate metal conduit. (mm)
The use of electrical metallic tubing shall be permitted for ____________(2).
exposed works and concealed works
The zone of protection of an overhead ground wire is conventionally taken as a ________.
The minimum spacing between bare metal parts of opposi te polari ty where mounted on the
same surface shall be ____(mm) for voltages rated NOT over ____(V) nominal .
The maximum electrical trade size of flexible metallic tubing shall be ____(mm).
is a protective device for limiting surge voltages by discharging or by passing
A convenience outlet circui t consisting of 8 outlets connected across a 220 V supply
considering 180 W per outlet, what is the maximum circuit current? (A)
Ans. 6.54 A
Plug fuses and fuse holders shall NOT be installed or used in circuits exceeding ______V
The standard length of rigid metal conduit is ______
For warehouses, the feeder demand load for the general l ighting and smal l appl iance load
for the first 12,500 VA or less is 100%, whi le the remainder over 12,500 VA is charged at
Liquid tight flexible non-metallic conduit shall NOT be used in lengths longer than ____(mm)
Line and ground connecting conductors to surge arresters shall NOT be smaller than ____(mm2) copper or _____(mm2) aluminum.
Electrical metallic tubing shall be securely fastened in place at least every ________(mm)
For the purpose of lightning protection, class I ordinary building is one that is at less than ____m in height.
For dwelling units, the demand factor for the first 3,000 VA of load is _____%
Ventilating pipes for motors, generators or other rotating electric machinery of for enclosures for electric equipment shall be of metal NOT less than _____(mm) in thickness.
. Direct burial cables or conductors with nominal voltage of 600 V or less and passes under streets, hi-ways, roads, alleys, driveways and parking lots shall have a minimum cover distance of _____(mm).
is a factory assembly of parallel conductors formed integrally with an insulating material web specifically designed for field installation in metal surface raceway.
Snap switches shall NOT be grouped or ganged in enclosures unless they can be so arranged that the voltage between adjacent switches does NOT exceed .
Wiring located above heated ceilings shall be NOT less than ______(mm) above the heated ceiling and shall be considered as operating at an ambient of 50C.
are rectangular sheet metal enclosures equipped with removable covers providing access to conductors inside.
Each unit length of heating cable shall have a permanent legible marking of each non-heating lead located within ______(mm) of the terminal end.
Metal faceplates or receptacles shall be of ferrous metal NOT less than _____(mm) in thickness or of non-ferrous metal NOT less than __(mm) in thickness.
Surface mounted incandescent fixtures shall be permitted to be installed in clothes closets provided there is a minimum clearance of _____(mm) between the fixture and the nearest point of the storage area.
Thermal insulation shall NOT be installed within _______(mm) of the recessed fixture enclosure.
Lighting track load shall NOT be installed where less than 1,500 mm above the finished floor EXCEPT where protected from physical damage.
Where circuit breakers are used to protect the primary side of a transformer over 600 V nominal, their continuous current rating shall NOT exceed _____% of the rated primary current.
The lowest standard size of disconnect is ___A (April 2016)
The primary winding of a step down transformer shall be protected on the primary side by an over-current device rated NOT more than ____% of the primary current.
For a two-wire FCC cable system with grounding, the ________ shall be the ___________.
Where passing through wood cross members in plastered partitions, conductors in concealed knob and tube wiring shall be protected by insulating tubes extending NOT less than ____(mm) beyond the wood member.
Branch circuit conductors supplying a single motor shall have an ampacity NOT less than ____% of the motor full load current rating.
In indoor wet locations, the entire wiring system including all boxes, fittings, control boards and panelboards shall be installed on walls with _____(mm) minimum clearance.
Type NM cable shall NOT be installed…
Where exposed to corrosive material
Where embedded in concrete
In a shallow chase in masonry, concrete or adobe
Dry type transformers installed indoors and rated ____kVA or less shall have a separation of at least _____(mm) from combustible material.
is a factory assembly of two or more insulated conductors in an extruded core of moisture resistant, flame retardant non-metallic material covered with an overlapping spiral metal tape and wire shield and jacketed with an extruded moisture, flame, oil, corrosion, fungus and sunlight resistant non-metallic material.
Type SNM cable
To cut rigid metal conduits, an electrician should use a _____ and _____.
ream the ends
Where the overload relay selected using the factor ____% is not sufficient to start the motor or to carry the load, the multiplying factor shall be increased but shall NOT exceed ___%.
Where the protection of a motor-compressor load is not sufficient for the starting current of the motor, the rating or setting shall be increased but NOT more than ___% of its rated load current.
is an insulator designed to electrically insulate the end of a type FCC cable.
consists of 3 or more flat copper conductor placed edge to edge separated and enclosed within an insulating assembly.
Flat conductor cable
Lamp holders installed in wet or damp locations shall be of the ________
The single-phase conductors supplying the phase converter shall have an ampacity NOT less than _______ the full load current rating of the motor or load being served.
is an assembly of 2 insulated conductors within a non-metallic jacket or an extruded thermoplastic covering.
Dry type transformers rated over _______V, shall be installed in vaults.
In walls or ceilings of concrete, tile, or other non-combustible materials, boxes and fittings shall be installed that the front edge of the box or fitting will NOT set back of the finished surface more than _____(mm).
is a single or multi-conductor solid dielectric insulated cable rated 2001 volts or higher
Type MV cable
In selecting the maximum setting of an instantaneous trip CB to be used to protect all AC motors from short circuit, a multiplying factor of ______% shall be used.
The paper spacer thickness of type IGS cable having a conductor size of 125 mm2 to 500 mm2 shall be _____(mm)
________ is the minimum number of over-current device of a lighting and appliance panel board that shall be installed in a cabinet.
Intermediate metal conduit shall be firmly fastened within ______(mm) of each outlet box, junction box, cabinet or fitting.
Resistance type heating elements in electric space heating equipment shall be protected at NOT more than ___(A)
Heavy-duty lighting track is a lighting track identified for use exceeding ___(A).
For three-phase motors supplied by any 3-phase system, the number of overload units required shall be _, one in each phase.
As compared with solid wires, stranded wires of the same cross sectional area have the following advantage EXCEPT one. Which one is this?
It is larger in overall diameter
It is easier to skin off the insulation
It is better for high voltage
It has a higher current rating
It is easier to skin off the insulation
Each length of the rigid metal conduit shall be clearly and durably identified in every _________(mm) as required.
For all single-phase motors, to protect them from short circuits and ground faults, a multiplying factor of ____% of its full load current rating shall be used the protective
device selected is a non-time delay fuse and_____% if the protective device is a time delay fuse.
Flexible metal conduit shall be supported within _______(mm) on each side of every outlet box, junction box, cabinet or fitting.
. The maximum electrical trade size of electrical metallic tubing shall be .(mm)
For installations of 2 mm2 conductors in 600 V circuits. What is the minimum insulation resistance allowed by the PEC (ohms)
Ans. 500,000 ohms
__________ transformers installed indoors and rated over _______kVAshall be furnished with a pressure relief vent.
In straight pulls, the length of the pull box shall NOT be less than ______the trade diameter of the largest raceway.
Busways shall be securely supported at intervals NOT exceeding _____(mm) unless otherwise designed and marked.
The smallest electrical trade size of a liquidtight flexible non-metallic conduit shall be ________(mm).
Boxes intended to enclose flush devices shall have an internal depth of NOT less than _____(mm).
A branch circuit supplying a fixed storage type water heater having a capacity of 450 liters or less shall have a rating NOT less than ____(mm) of the nameplate rating of the water heater.
is define as the shortest distance measured between a point on the top surface of any direct buried conductor, cable, conduit and the top surface of finish grade.