Pec 6 Flashcards
For non-dwelling receptacle loads, the demand factor for the first 10 kVA or less shall be ___%.
100%
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.
460 mm
The ampacity of the conductors can be derated at most, _ times.
3
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
Frequency rating
Frequency rating
If potential exceeding ___V are employed, a permanent warning sign shall be displayed.
600 V
is a load where maximum current is expected to continue for 3 hours or more. (April 2016)
Continuous load
Communication conductors shall NOT be smaller than (mm2)
2 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
125%
A wye-delta starter for a single voltage three phase squirrel cage induction motor would require the connection of _____ from the motor.
6 wires
At least (_) receptacle outlet shall be installed outdoors for a one family dwelling unit.
1
is the maximum permitted load of a 15 A branch circuit. (A)
12 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.
125%
Faceplates of insulating material shall be non-combustible and NOT less than _____(mm) in thickness.
2.3 mm
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.
20 mm
22 mm2
8 times
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).
14 mm2
Ground counterpoise conductor shall be soft copper wire NOT smaller than ____(mm2)
8 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.
600 volts
115%
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.
Transfer switch
. 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.
75%
refers to the power plant mounted on wheels as used in the railroad transportation industry.
Electric locomotive
If the terminal of the equipment grounding conductor is not visible, the conductor entrance hole shall be marked with the word “_______”.
green
Type NMC (non-metallic sheathed cable) shall have an outer covering which has the following characteristics. Which one is NOT included?
Flame retardant
Moisture resistant
Corrosion resistant
None of these
None of these