HW Test #3 Flashcards
the feeder conductor ampacity shall be less than that of the service-entrance conductors where the feeder conductors carry the total load supplied by service conductors with an ampacity of _______ or less
55 A
310.15(b)(6)
for other than dwelling occupancies, banks, or office buildings, each receptacle outlet shall be calculated at not less than _____ VA.
180
How many receptacle outlets are permitted on a 20 A, 120 V circuit in a commercial building?
13
for show-window lighting, a load of not less than 660 volt-amperes/ linear meter or ____ volt amperes/ linear foot shall be included for show window measured horizontally along its base
200
open conductors which are not service entrance cables shall not be installed (above grade) less than which of the following
10 feet below grade level
what is the feeder or service calculated load for a waste disposal (940 VA), dishwasher (1250 VA), a trash compactor (1100 VA), and a water heater (4500 VA)?
5843 VA
a load demand factor of 75 percent is permitted for _____ or more appliances fastened in place such as waste disposals, dishwashers, trash compactors, water heaters, etc
four or more
what is the feeder or service calculated load for a waster disposal (940 VA), dishwasher (1250 VA), and a water heater (4500 VA)?
6690 VA
open conductors shall be __________ on glass or porcelain knobs, racks, brackets, or stain insulators
supported
open conductors installed outside shall be separated from open conductors of other circuits or systems by not less than ____
4 in
225.14(c)
the minimum clearance for overhead feeder conductors not exceeding 600 V that pass over commercial areas subject to truck traffic is ______
18 feet
overhead feeder conductors shall have a minimum _____ vertical clearance over residential property and driveways, as well as those commercial areas not subject to truck traffic, where the voltage is limited to 300 volts to ground
12 feet
225
conductors are considered outside a buildings when they are buried under not less than
2 “
230.6
service conductors installed as unjacketed multiconductor cable shall have a minimum clearance of ______ from windows that are designed to be opened, doors, porches, stairs, fire escapes, or similar locations
3 feet
service drops installed over roofs shall have a vertical clearance of ______ above the roof surface, unless a lesser distance is permitted by an exception
8 feet
when the service disconnecting means is a power-operated switch or circuit breaker, it shall be able to be opened by hand in the event of a ______
power supply failure
the vertical clearance from ground level over a residential driveway for overhead service, conductors not subject to truck traffic and are less than 3000 volts to ground shall be _____-
12 feet
where it is impracticable to locate the service head above the point of attachment, the service head location shall be permitted not farther than ______ from the point of attachment
24”
ammendments
what is true about installation of a TYPE 1 TVSS
can be connected to line side of a service disconnect
ground-fault protection of equipment shall be provided fro solidly grounded WYE electrical services of more than 150 volts-to-ground, but not exceeding 600 V phase-to-phase for each service disconnecting means rated _____
1,000 A
a multifamily building has 12 units, the system voltage is 120/240 V, a single-phase. Each 1,500 sq ft unit contains the following:
what is the buildings feeder/ service calculated load for the 4.5 kW dryers?
27.6 kW
dryer less than 5,000 kw, than use 5,000.
the maximum voltage drop from service point to the last overcurrent device in a dwelling unit?
4%
what is the minimum lateral size service conductor allowed for a dwelling unit
4 copper and (#2 aluminum)
230.31 (B) nyc ammend
