PEC 3 Flashcards
The bonding conductor used in agricultural buildings shall be copper, insulated, covered or bare, NOT smaller than ______(mm2).
8.0mm2
In any watercraft, the motor circuit shall have an ampacity of NOT less than _____% of the motor’s full load current rating
100%
The largest size of electrical metallic tubing is _____(mm).
100 mm
The overload relay used to protect each motor-compressor set shall be selected to trip at NOT more than ______% of the motor-compressor rated load current.
140%
Lamp protection shall be provided by elevation of at least ___(m) from the normal working surface
2 m
Type UF cable shall NOT be used as ____________.
service entrance
Where ____ pulls are made on the pull box, the distance between each raceway entry inside the box and the opposite wall of the box shall NOT be less than _____ the trade diameter of the largest raceway in a row.
“U”
6 times
Reference ambient temperature for explosion proof electrical equipment shall be ___C
50C
is a process wherein coalescence is produced by heating with an electric arc with or without the application of pressure and with or without the use of filler metal.
Arc welding
The use of underground feeder cables may NOT be used in the following conditions EXCEPT one. Which one is this?
Embedded in concrete
Hazardous location
Direct burial
Theaters
Direct burial
Faceplates of insulating materials shall be non-combustible and NOT less than _____(mm) in thickness.
2.5 mm
Conductors supplying _____ motors shall have an ampacity equal to the sum of the FLA rating of all motors plus ____% of the highest motor FLA in the group.
two or more
25%
____ color identifies the grounded conductor of a branch circuit.
White
_______ is an enclosure of porcelain or other insulating material, fitting with terminals and intended for connecting the flexible cord carrying a pendant to the permanent wiring.
Rosette
Receptacles installed for the attachment of portable cords shall be rated at NOT less than (2) .
15 A, 250 V
Motors with a marked service factor of less than 1.15 shall have an overload protection equal to ___% of the motor’s FLA.
115%
Cables and cords supplied through plugging boxes shall be of _____.
copper
Which of the following statements is NOT correct?
Over-current devices shall be located where they will not be exposed to physical damage.
Over-current devices shall be readily accessible.
Over-current devices may be located inside clothes closets.
In a multi-family dwelling, each occupant shall have ready access to all over-current devices protecting his occupancy.
Over-current devices may be located inside clothes closets.
A conductor or group of conductors, in switchgear assemblies which serves as a common connection for two or more circuits
Ans. Bus
The ampacity of capacitor circuit conductors shall NOT be less than ____% of the rated current of the capacitor.
135%
The alternate or back-up source of power in a hospital shall have a capacity to sustain its connected loads for a minimum of ___ hours
1.5
The load for the required branch circuit installed for the supply of exterior signs or outline lighting shall be computed at a minimum of ______(VA)
1,200 VA.
The usual function of a disconnect switches in high voltage circuits is _________________________
to isolate from energized buses, equipment which are not in service.
Pendant conductors where not cabled and longer than ______(mm) length shall be twisted.
900 mm
The ampacity of the phase conductors from the generator terminals to the first over-current device shall NOT be less than ____% of the nameplate current rating of the generator.
115%
What is the maximum number of conductors permitted in a wireway at any cross-section, signal circuit or starter-control wires are not included?
(30 conductors, 50 conductors, 40 conductors, 25 conductors)
30 conductors
Each motor shall be provided with only _ disconnect.
1
Energized parts of a generator operated at more than ___V to ground shall NOT be _______ to accidental contact where _______ to ___________.
50 V
exposed
accessible
unqualified persons
A hoisting and lowering mechanism equipped with a car or platform which moves in guides in a substantially vertical direction and which serves two or more floors of a building or structure.
Ans. Elevator
is an assembly of a flexible cord with an attachment plug on one end and a cord connector on the other
Extension cord
Any box NOT over ______cm3 in size, intended for mounting in closed building construction shall be affixed with _____ or _______ as to provide a rigid and secure installation.
1,640 cm3
anchors, clamps
In battery rooms with alkaline batteries, the shelves shall be lined with steel sheet NOT less than ____(mm) thick.
75 mm
__________ is a disruptive discharge around or over the surface of a solid or liquid insulator.
Flashover
Emergency lighting of __ lux shall be provided in exit paths from all areas of attended stations.
10
An overheated cord often indicates__________ and _________.
corroded terminals
defective cord
___________ grounding conductors shall NOT be smaller than ______(mm2) copper.
Individual arrester
14 mm2
is a generic term for an artificial source of light.
Lamp
Cable bus shall be securely supported at intervals NOT exceeding ______(mm).
3,600 mm
Snap switches used with open wiring on insulators shall be mounted on insulating material that separates the conductors at least _____ (mm) from the surface wired over.
13 mm
The usual nameplate data on DC motors include the following EXCEPT one. Which one is this?
Manufacturer’s name
Rated frequency
Rated voltage
Rated speed
Rated frequency
Vertical runs of wireways shall be securely supported at intervals NOT exceeding _______(mm)
4,500 mm
Size 0.75 mm2 fixture wire has an ampacity of __(A).
6 A
Type MI cable shall NOT be used where .
exposed to destructive corrosive conditions
Each receptacle for DC plugging boxes shall be rated at NOT less than ____(A).
30 A
Insulated ground conductor of 14 mm2 or smaller shall be identified by a continuous white outer finish along its entire length or another color which is ________.
natural gray
Metal covers for boxes shall be _____ with firmly attached ____________ NOT less than ____(mm)
lined
insulating material
0.80 mm
Electrical non-metallic tubing shall NOT be used where the voltage is over _____V.
600 V
The system neutral conductor shall NOT be connected to ground EXCEPT
When the generator frame is not grounded
Through the grounding impedance
Through a grounding transformer
When a ground fault is very common
Through the grounding impedance
When thermal overload relay are used for the protection of a three-phase induction motor, their primary purpose is to protect the motor in case of ___________.
sustained overload
In type AC cable, all bends shall be made so that the cable will not be damage and the radius of the curve of the inner edge of any bend shall NOT be less than _ times the diameter.
5
Non-metallic sheathed cable shall be supported within ______(mm) from every cabinet, box or fitting.
300 mm
is the nominal supply voltage specified by the PEC for residential homes.
230 VAC
__________ wiring shall NOT be used in hoistways.
Messenger supported
Temporary electrical power and lighting installations shall be permitted for a period NOT to exceed _____ for Christmas decorative lighting, carnivals and similar purposes.
90 days
_____ conductors is NOT applicable on wet locations.
Type THHN
is a surge of unidirectional polarity.
Impulse
For each small appliance branch circuit, the feeder load shall be _______VA per ___A circuit.
1,500 VA
20 A
The electrical plans for residential house include the following items EXCEPT one. Which one is this?
Substation plan
Location plan
Floor plan showing location of service
Layout of wiring plan for general lighting and receptacle outlets
Substation plan
Tools and portable hand lamps likely to be used in wet and conductive locations shall NOT be required to be grounded where supplied through an isolating transformer with an ungrounded secondary of NOT more than ___V.
50 V
The minimum size of branch circuit capacity to supply laundry receptacle outlets shall be ___A.
20 A