4A module 1
When calculations in Article 220 result in a fraction of an ampere that is less than _____, such fractions can be dropped.
0.5
Where a building is designed and constructed to comply with an energy code adopted by the local authority and specifying an overall lighting density of less than 1.20 VA per 1.20 sq ft, the unit lighting loads in Table 220.12 for office and bank areas within the building shall be permitted to be reduced by _____ VA per sq ft.
1
Ground fault protection of equipment shall be provided for solidly grounded wye electrical services of more than 150 volts to ground, but not exceeding 1,000V phase to phase for each service disconnecting means rated _____ or more.
1,000A
The maximum length of a feeder tap conductor in a high bay manufacturing building over 35 ft high shall be _____ ft.
100
Under the optional method for calculating a single family dwelling service, general loads beyond the initial 10 kVA are assessed at a _____ per-cent demand factor.
40
A demand factor of _____ percent applies to a multifamily dwelling with ten units if the optional calculation method is used.
43
A dwelling unit containing three 120V small appliance branch circuits has a calculated load of _____ VA for the small appliance circuits.
4500
The maximum unbalanced feeder load for household electric ranges, wall mounted ovens, and counter mounted cooking units shall be considered as _____ percent of the load on the ungrounded conductors.
70
Type _____ fuse adapters shall be designed so that once inserted in a fuseholder they cannot be removed.
S
Outside secondary conductors can be of unlimited length without overcurrent protection at the point they receive their supply if the conductors _____.
a and b
Underground service conductors shall have _____.
a and b
Overcurrent devices are not permitted to be located in the bathrooms of _____.
all of these
Plug fuses of the Edison base type shall be used only _____.
as a replacement in existing installations
Underground service conductors that supply power to limited loads of a single branch circuit shall not be smaller than _____.
c) 12 AWG copper
A device that, when interrupting currents in its current limiting range, reduces the current flowing in the faulted circuit to a magnitude substantially less than that obtainable in the same circuit if the device were replaced with a solid conductor having comparable impedance, is a(n) "_____ protective device."
current limiting overcurrent
Fuseholders for cartridge fuses shall be so designed that it is difficult to put a fuse of any given class into a fuseholder that is designed for a _____ lower or a _____ higher than that of the class to which the fuse belongs.
current, voltage
For installations consisting of not more than two 2 wire branch circuits, the service disconnecting means shall have a rating of not less than _____.
d) 30A
Additional services shall be permitted for different voltages, frequencies, or phases, or for different uses, such as for _____.
different rate schedules
Where conduits are used as service masts, hubs shall be _____ for use with service entrance equipment.
identified
When applying the demand factors of Table 220.56, the feeder or service demand load shall not be less than the sum of the _____.
largest two kitchen equipment loads
The service disconnecting means rated 1,000V or less shall be marked to identify it as being suitable for use as service equipment and shall be _____.
listed or field labeled
There shall be no reduction in the size of the neutral or grounded conductor on _____ loads supplied from a 4 wire, wye connected, three phase system.
nonlinear
A service disconnecting means shall be installed at a(n) _____ location.
readily accessible
The additional service disconnecting means for fire pumps, emergency systems, legally required standby, or optional standby services, shall be installed remote from the one to six service disconnecting means for normal service to minimize the possibility of _____ interruption of supply.
simultaneous
Each service disconnecting means shall be suitable for _____.
the prevailing conditions
The requirement to maintain a 3 foot vertical clearance from the edge of a roof does not apply to the final conductor span where the service drop is attached to _____.
the side of a building
Ground fault protection of equipment shall be provided for solidly grounded wye electrical systems of more than 150 volts to ground, but not exceeding 1,000V phase to phase for each individual device used as a building or structure main disconnecting means rated _____ or more, unless specifically exempted.
1,000A
When taps are not over 10 ft in length for field installations, and they leave the enclosure or vault in which the tap is made, the ampacity of the tap conductors cannot be less than _____ the rating of the device protecting the feeder.
1/10
Individual open conductors and cables, other than service entrance cables, shall not be installed within _____ ft of grade level or where exposed to physical damage.
10
Overhead service conductors shall have a horizontal clearance of not less than _____ ft from a pool.
10
The minimum point of attachment of overhead service conductors to a building shall not be less than _____ ft above finished grade.
10
Feeder and service loads for fixed electric space heating loads shall be calculated at _____ percent of the total connected load.
100
The load for electric clothes dryers in a dwelling unit shall be _____ watts or the nameplate rating, whichever is larger, per dryer.
5000
Switches containing fuses and circuit breakers shall be readily accessible and installed so the center of the grip of the operating handle of the switch or circuit breaker, when in its highest position, is not more than _____ above the floor or working platform.
6 ft 7 in.
Individual meter socket enclosures shall not be considered service equipment but shall be _____ for the voltage and ampacity of the service.
Listed and rated
_____ shall not be located over the steps of a stairway.
Over-current devices
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
Circuit breakers used to switch 120V and 277V fluorescent lighting circuits shall be listed and marked _____.
SWD or HID
Edison base fuseholders shall be used only if they are made to accept _____ fuses by the use of adapters.
Type S
In a multiple occupancy building, each occupant shall have access to the occupant's _____.
a) service disconnecting means
Flexible cords approved for and used with a specific listed appliance or luminaire shall be considered to be protected by the branch circuit overcurrent device when _____.
applied within the listing requirements
There shall be no more than _____ disconnects installed for each service or for each set of service entrance conductors as permitted in 230.2 and 230.40.
c. six
Conductor overload protection shall not be required where the interruption of the _____ would create a hazard, such as in a material handling magnet circuit or fire pump circuit. However, short circuit protection is required.
circuit
A(n) _____ shall be of such design that any alteration of its trip point (calibration) or the time required for its operation requires dismantling of the device or breaking of a seal for other than intended adjustments.
circuit breaker
A device comprised of _____ or more receptacles shall be calculated at not less than 90 VA per receptacle.
four
When sizing a feeder for the fixed appliance loads in dwelling units, a demand factor of 75 percent of the total nameplate ratings can be applied if there are _____ or more appliances fastened in place on the same feeder.
four
Plug fuses of 15A or less shall be identified by a(n) _____ configuration of the window, cap, or other prominent part to distinguish them from fuses of higher ampere ratings.
hexagonal
In a multiple occupancy building where electric service and electrical maintenance are provided by the building management under continuous building management supervision, the service disconnecting means can be accessible to authorized _____ only.
management personnel
Circuit breakers shall be capable of being closed and opened by manual operation. Operation by other means, such as electrical or pneumatic, shall be permitted if means for _____ operation is also provided.
manual
Dimensions of Type S fuses, fuseholders, and adapters shall be standardized to permit interchangeability regardless of the _____.
manufacturer
Supplementary overcurrent protection _____.
may be used to protect internal circuits of equipment
A building or structure shall be supplied by a maximum of _____ service(s), unless specifically permitted otherwise.
one
The general requirement for each service drop, set of overhead service conductors, set of underground service conductors, or service lateral is that it shall supply _____ set(s) of service entrance conductors
only one
Circuit breakers shall _____ all ungrounded conductors of the circuit both manually and automatically unless specifically permitted otherwise.
open
Branch circuits that supply lighting units that have ballasts, transformers, autotransformers, or LED drivers shall have the calculated load based on _____ of the units, not to the total wattage of the lamps.
the total ampere rating
The minimum size service drop conductor permitted is _____ AWG copper or _____ AWG aluminum or copper clad aluminum.
underground distribution system
Cable trays used to support service entrance conductors shall contain only service entrance conductors _____.
unless a solid fixed barrier of a material compatible with the cable tray separates the service entrance conductors from other conductors
Flexible cord used in listed extension cord sets shall be considered protected against overcurrent when used _____.
within the extension cord's listing requirements
Overhead service conductors shall have a minimum of _____ ft vertical clearance from final grade over residential property and driveways, as well as over commercial areas not subject to truck traffic where the voltage does not exceed 300 volts to ground.
12
For installations that supply only limited loads of a single branch circuit, the service disconnecting means shall have a rating not less than _____.
15A
The minimum clearance for overhead service conductors not exceeding 600V that pass over commercial areas subject to truck traffic is _____ ft.
18
If a set of 120/240V overhead service conductors terminate at a through the roof raceway or approved support, with less than 6 ft of these conductors passing over the roof overhang, the minimum clearance above the roof for these service conductors shall be _____.
18 in.
For other than dwelling occupancies, banks, or office buildings, each receptacle outlet shall be calculated at not less than _____ VA.
180
The feeder/service calculated load for a multifamily dwelling containing nine 12 kW ranges is _____.
24,000W
Service conductors installed as unjacketed multiconductor cable shall have a minimum clearance of _____ ft from windows that are designed to be opened, doors, porches, balconies, ladders, stairs, fire escapes, or similar locations.
3
Underground service conductors shall be protected from damage in accordance with _____ including minimum cover requirements.
300.5
A dwelling unit containing two 120V laundry branch circuits has a calculated load of _____ VA for the laundry circuits.
3000
Plug fuses of the Edison base type shall have a maximum rating of _____.
30A
Where fixed multioutlet assemblies are used in other than dwelling units or the guest rooms of hotels or motels, each _____ or fraction thereof of each separate and continuous length shall be considered as one outlet of not less than 180 VA where appliances are unlikely to be used simultaneously.
5 ft
A circuit breaker having an interrupting current rating of other than _____ shall have its interrupting rating marked on the circuit breaker.
5,000A
Overhead service conductors installed over roofs shall have a vertical clearance of not less than _____ ft above the roof surface, unless a lesser distance is permitted by an exception.
8
Underground copper service conductors shall not be smaller than _____ AWG copper.
8
The minimum size service drop conductor permitted is _____ AWG copper or _____ AWG aluminum or copper clad aluminum.
8, 6
When calculating a feeder or service load for existing installations, if the maximum demand data for a 1 year period is not available, the calculated load shall be permitted to be based on the maximum demand (the _____ kilowatts reached and maintained for a 15 minute interval) continuously recorded over a minimum 30 day period using a recording ammeter or power meter connected to the highest loaded phase of the feeder or service, based on the initial loading at the start of the recording.
highest average
Overcurrent protection for conductors and equipment is provided to _____ the circuit if the current reaches a value that will cause an excessive or dangerous temperature in conductors or conductor insulation.
open
The service disconnecting means shall plainly indicate whether it is in the _____ position.
open or closed
On a three phase, 4 wire, delta connected service where the midpoint of one phase winding is grounded, the service conductor having the higher phase voltage to ground shall be durably and permanently marked by an outer finish that is _____ in color, or by other effective means, at each termination or junction point.
orange
A circuit breaker with a _____ rating, such as 120/240V or 277/480V can be used on a solidly grounded circuit where the nominal voltage of any conductor to ground does not exceed the lower of the two values, and the nominal voltage between any two conductors does not exceed the higher value.
slash
Additional services shall be permitted for a single building or other structure sufficiently large to make two or more services necessary if permitted by _____.
special permission
A circuit breaker with a _____ voltage rating, such as 240V or 480V, can be used where the nominal voltage between any two conductors does not exceed the circuit breaker voltage rating.
straight
For other than dwelling units or guest rooms of hotels or motels, the feeder and service calculation for track lighting shall be calculated at 150 VA for every _____ ft of lighting track or fraction thereof unless the track is supplied through a device that limits the current to the track.
2
The minimum feeder load for show window lighting is _____ VA per linear foot.
200
The vertical clearance of final spans of overhead service conductors above, or within _____ ft measured horizontally of platforms, projections, or surfaces that will permit personal contact shall be maintained in accordance with 230.24(B).
3
Service entrance cables mounted in contact with a building shall be supported at intervals not exceeding _____.
30 in.
If the circuit's overcurrent device exceeds _____, the conductor ampacity shall have a rating not less than the rating of the overcurrent device.
800A
Using the standard load calculation method, the feeder demand factor for five household clothes dryers is _____ percent.
85
