101-200
Calculations shall be permitted to be rounded to the nearest whole ampere, with decimal fractions smaller than ____ dropped.
- 0.5 -Branch-Circuit, Feeder, and Service Calculations - 220.5(B) Calculations - Fractions of an Ampere
Fixed electric space-heating loads shall be calculated at ____ percent of the total connected load. A. 70
-100 -Branch-Circuit, Feeder, and Service Calculations - 220.51 Fixed Electric Space Heating
Each feeder disconnect, with a minimum of ____ amperes and installed on a solidly grounded wye electrical system with a minimum of 150 volts to ground, shall be provided with ground-fault protection of the equipment.
-1000 -Feeders - 215.10 Ground-Fault Protection of Equipment
Each dwelling unit shall have the load calculated at ____ volt-amperes for each 2-wire small-appliance branch circuits.
-1500 -Branch-Circuit, Feeder, and Service Calculations - 220.52(A) Small-Appliance and Laundry Loads — Dwelling Unit - Small-Appliance Circuit Load
What is the minimum unit lighting load for a dwelling unit (in-volt amperes/ft^2)
-3 -Branch-Circuit, Feeder, and Service Calculations - 220.12 Lighting Load for Specified Occupancies, Table 220.12
How many 3-wire feeds are permitted to utilize a common neutral?
-3 -Feeders - 215.4(A) Feeders with Common Neutral Conductor - Feeders with Common Neutral
Service entrance conductors may be spliced or tapped in accordance with 110.14 and ____.
-300.5(E) -300.13 -300.15
Loads for structural additions to an existing dwelling unit, which exceeds ____ square feet, shall be calculated in accordance with 220.12 and 220.14.
-500 -Branch-Circuit, Feeder, and Service Calculations - 220.16(A)(1) Loads for Additions to Existing Installations - Dwelling Units
The feeder conductor ampacity shall be a minimum of that of the service conductors where the feeder conductors carry the total load supplied by service conductors with an ampacity of ____ amperes or less.
-55 -Feeders - 215.2(A)(3) Minimum Rating and Size - Feeders Not More Than 600 Volts - Ampacity Relative to Service Conductors
What would the feeder or service load for general lighting be for a dwelling where the lighting load is 20,000 volt-amperes?
-8950 -Branch-Circuit, Feeder, and Service Calculations - 220.42 General Lighting, Table 220.42
Under what occupancies are additional services permitted with special permission?
-a single building or other structure sufficiently large to make two or more services necessary -multiple occupancy buildings where there is no available space for service equipment accessible to all occupants
Underground service conductors shall have _____.
-adequate mechanical strength -sufficient ampacity to carry the current for the load as calculated in accordance with article 220
After the first 10 kVA, the nameplate rating of ____ is used for calculating the load for dwelling unit using the optional feeder and service load calculations.
-all appliances that are fastened in place, permanently connected or located to be on a specific circuit -ranges, wall mounted ovens and counter mounted cooking units -water heaters
A diagram showing feeder details may be required by ____.
-authority having jurisdiction -Feeders - 215.5 Diagrams of Feeders
____ shall be permitted within raceways with service conductors.
-bonding jumpers -bonding conductors -grouding electrode conductors
Additional services are permitted based on capacity when ____.
-by special permission -where the capacity required are in excess of 2000 amperes at a supply voltage of 1000 volts or less -where the load requirements of a single phase installation are greater than the serving agency normally supplies through one service
The disconnecting means that supplies or passes through a building shall be comprised of a ____.
-circuit breaker -general-use switch -snap switch
For a feeder that supplies ____ the rating of the overcurrent devices shall not be less than the noncontinuous load plus 125 percent of the continuous load.
-continuous loads or noncontinuous loads -Feeders - 215.3 Overcurrent Protection
Article 230 of the NEC covers service conductors and equipment for ____.
-control -protection of services and their installation requirements
Table 220.84 may be used instead of Part III of Article 220 for feeder or service load calculations for multifamily dwellings when ____.
-each dwelling unit is equipped with electric cooking equipment -each dwelling unit is equipped with either electric space heating or air conditioning or both -no dwelling is supplied by more than one feeder
The load factor for four or more appliances fastened in place except for ____ may be calculated at 75% of the nameplate rated loads.
-electric ranges; clothes dryers; space heating and air conditioning equipment -Branch-Circuit, Feeder, and Service Calculations - 220.53 Appliance Load — Dwelling Unit(s)
When a feeder is installed in a metal raceway, all feeder conductors using the same neutral conductor shall be ____.
-enclosed in the same raceway -feeders - 215.4(B) Feeders with Common Neutral Conductor - In Metal Raceways or Enclosure Feeders - 215.5 Diagrams of Feeders
Feeders shall not be derived from autotransformers without exception.
-false -Feeders shall not be derived from autotransformers without exception.
The calculated load of a ____ shall not be less than the sum of the loads on the branch circuits supplied.
-feeder or service -Branch-Circuit, Feeder, and Service Calculations - 220.40 General
Additional branch circuits or feeders are permitted to supply a building for ____.
-fire pumps, emergency systems, electric vehicle charging stations
A feeder shall ____ an equipment grounding conductor in accordance with the provisions of 250.134 when a feeder supplies branch circuits that require an equipment grounding conductor.
-include or provide -Feeders - 215.6 Feeder Equipment Grounding Conductor
Disconnection means shall be provided for disconnecting all ungrounded conductors that ____ a building or structure.
-pass through -serve
When a feeder is supplied from more than one nominal voltage system each ungrounded conductor of a feeder shall be identified be identified by ____ for each phase or line and system at all termination, connection and splice points.
-separate color coding, marking tape, tagging or other approved means. -Feeders - 215.12(C)(1)(a) Identification for Feeders - Identification of Ungrounded Conductor - Feeders Supplied from More Than One Nominal Voltage System - Means of Identification
Service-entrance cables shall be supported by straps within 12 inches of every ____ and at intervals not exceeding 30 inches.
-service head -gooseneck -connection to a raceway or enclosure
Optional feeder and service load calculations apply to dwelling units having the total connected loaded server by a ____ service or feed conductors with an ampacity of 100 amperes or greater.
-single 120/240 volt, 208Y/120 volt set of 3-wire
What floor area (square footage) is using in calculating the minimum lighting load for an occupancy?
-the outside dimensions of the building -Branch-Circuit, Feeder, and Service Calculations - 220.12 Lighting Load for Specified Occupancies
The minimum service entrance conductor size shall have a minimum ampacity of ____
-the sum of continuous loads -the sum of noncontinuous loads
The total load for an inductive lighting or LED lighting loads shall be calculated based on ____.
-total ampere rating of load -Branch-Circuit, Feeder, and Service Calculations - 220.18(B) Maximum Loads - Inductive and LED Lighting Loads
A GFCI in a readily accessible location may be used to protect a feeder supplying 15- and 20-ampere receptacle branch circuits.
-true -Feeders - 215.9 Ground-Fault Circuit-Interrupted Protection for Personnel
____ are permitted to have one set of service entrance conductors installed to supply the circuits covered in 210.25.
-two family dwelling -multifamily dwellings -multiple occupancy buildings
Conductors or cables other than service entrance conductors shall be be installed within ____ feet of grade level or where exposed to physical damage.
10
If an open individual (aerial) overhead conductor is located within ____ feet of a building or structure it shall be insulated.
10
When cable trays are used for service entrance conductors the cable tray shall have permanently affixed labels with the words "Service-Entrance Conductors" at intervals not to exceed ____ feet.
10
When using the optional feeder and service load calculations for a dwelling unit the calculated load shall not be less than 100% on the first ____ kVA.
10
Under no circumstances shall the point of attachment for overhead service conductors be less than ____ feet above finished grade.
10 feet
If no additional air-conditioning equipment will be installed, the first 8 kVA of load will be calculated at ____ percent of the load.
100
The ampacity of the service entrance conductors is permitted to be the sum of the noncontinuous and continuous loads If the service entrance conductors terminate in an overcurrent device where both the overcurrent device and it assembly are listed for operation at ____ percent of their rating.
100
What is the minimum vertical clearance for overhead service conductors, not exceeding 300 volts to ground, over residential property and driveways and commercial areas not subject to truck traffic?
12 feet
In an area listed in the 12 foot classification, where voltage exceeds 300 volts to ground, an overhead span of open conductors, not over 1000 nominal volts, shall have a minimum clearance of ____ feet.
15
Non service entrance conductors that are not approved for mounting in contact with a building shall be mounted on insulating supports installed at intervals not exceeding ____ feet.
15
When supplying only limited loads of a single branch circuit, the branch circuit disconnecting means shall have a rating of not less than ____ amperes.
15
After the first 10 kVA, how many volt-amperes for each 2-wire, 20-ampere small appliance branch circuit is used for each dwelling unit using the optional feeder and service load calculations.
1500
Conductors are considered to be outside a building where installed in conduit under not less that ____ inches of earth beneath a building.
18
Additional branch circuits or feeders are permitted where the capacity requirements are in excess of ____ amperes at a supply voltage of 1000 volts or less.
2000
What is the minimum vertical clearance for overhead service conductors over railroad tracks?
24 1/2 ft
How many volt-amperes/ft2 is used for general lighting and general use receptacles using optional feeder and service load calculations?
3
The minimum clearance for service conductors installed as open conductors must be not less than ____ feet from windows that open, doors, porches, balconies and fire escapes.
3
The minimum vertical clearance for service conductors is ____ feet above platforms, projections or surfaces that might permit personal contact.
3
Where the voltage between overhead service conductors does not exceed ____ volts and the roof has a slope of 4 in 12 or greater, a reduction of vertical clearance of 3 feet is permitted.
300
Underground service conductors must be protected against damage in accordance with Article ____.
300.5
An open conductor shall be separated from an open conductor of another circuit or system by a minimum of ____ inches.
4
If additional air-conditioning equipment is to be installed, the remainder of all other loads will be calculated at ____ percent of the load.
40
What is the maximum span for overhead conductors for festoon lighting not supported by messenger wire?
40 feet
Using the optional feeder and service load calculations what percentage of the nameplate rating of electric space heating if four or more separately controller units are used.
40%
What percent of the load after the first 10 kVA is used to calculate the remainder for dwelling loads using the optional feeder and service load calculations?
40%
A copper-clad aluminum conductor used for underground service conductors shall be a minimum of ____ AWG.
6 AWG
Overhead service conductors shall not be smaller than ____ AWG aluminum or copper-clad aluminum.
6 AWG
What is the minimum wire size for individual aluminum conductors, 1000 volts or less, not supported by a messenger wire for a span longer than 50 feet?
6 awg
When individual open conductors up to 1000 volts are supported a maximum interval of 9 feet what is the minimum clearance between conductors?
6 inches
Overhead service conductors shall not be smaller than ____ AWG copper.
8 AWG
An overhead service conductor shall have a minimum vertical clearance of ____ feet above the roof surface.
8 feet
Open multiconductor cables shall have a minimum clearance, above a roof surface, of ____.
8 feet 6 inches
all of the following wiring methods are permitted for underground service conductors except _____.
EMT
The load on an outdoor feeder shall be determined by Part ____ of Article 220 of the NEC.
III
Which of the following wiring methods is NOT allowed service entrance conductors 1000 volts, nominal, or less.
MV
Service conductors supplying a building or other structure ____ pass through the interior of another building or other structure.
Shall not
Individual overhead service conductors shall be ____.
covered and/or insulated
A disconnecting means shall be installed either inside or outside of a tower or pole used as a lighting standard.
false
All service entrance conductors entering or on the exterior of a building shall be insulated.
false
Conductors other than service conductors are permitted within a raceways with service conductors.
false
In all cases a building or other structures served shall be supplied by only one service.
false
Other ungrounded conductors are permitted in a cable tray system used to support service entrance conductors.
false
A hub intended for used with a conduit the serves as a service mast must be ____ for use with service entrance equipment.
identified
The ____ dimensions of a dwelling unit are used for optional feeder and service load calculations of lighting and general use receptacles.
inside
If a building has more than one occupancy, it ____ permitted to have one set of service entrance conductors for each service.
is
When using the optional feeder and service load calculations for a dwelling unit, the ____ of the load in kVA listed in the subsections that follow is included in the load calculation.
largest
Where two dwelling units are supplied by a single feeder and the calculated load under Part III of this article exceeds that for three identical units calculated under 220.84, the ____ of the two loads shall be permitted to be used.
lesser
The calculation of a feeder load for existing installations shall use the actual ____ demand to determine the existing load when the ____ demand data is available for a 1-year period.
maximum
The minimum ampacity for ungrounded conductors for specific installations shall ____ than the rating of the service disconnecting means.
not be less
Service entrance conductors must have an ampacity of ____ load to be served.
not less than the maximum
For lighting equipment installed outdoors, the ampacity of the neutral conductor shall ____ net calculated load current between the neutral conductor and all ungrounded conductors connected to any one phase of the circuit.
not to be more than the maximum
The maximum unbalanced load shall be the maximum net calculated load between the neutral conductor and any ____ ungrounded conductor(s).
one
Under normal circumstances each service drop, set of overhead service conductors, set of underground service conductors or service lateral shall supply ____ set of service entrance conductors.
one
The disconnecting means, for a building or structure, shall plainly indicate whether it is in the ____ position.
open or closed
If a farm dwelling has electric heat and the farm has electric grain-drying system, which part of Article 220 of the NEC shall not be used to calculate the dwelling load where the dwelling and farm loads are supplied by a common service?
part IV
Which of the following is NOT a permitted different characteristic for an additional service?
phase
Where service entrance conductors are subject to physical damage they must NOT be protected by ____.
schedule 40 pvc
A service raceway that enters a building from an underground distribution system shall be ____ in accordance with 300.5(G).
sealed
Multiconductor cables used for overhead service conductors shall be attached to buildings by fittings identified for use with ____ conductor
service
If there is a coupling in the conduit that serves as a service mast, the service drop or overhead service conductors ____ attached to the service mast between the weatherhead and the coupling.
shall not be
One set of service entrance conductors is permitted to supply each of several service equipment enclosures when two to ____ service disconnecting means in separate enclosures are grouped at one location and supply separate loads from one service drop, set of overhead service conductors, set of underground service conductors or service lateral.
six
Each occupant of multiple-occupancy building shall have access to the occupant's ____.
supply disconnecting means
A grounded conductor of bare copper used in a raceway used for underground service conductors shall be permitted to be uninsulated.
true
Only the largest load expected to be used at one time need be used for calculating the total load of a feeder when it is unlikely that more than two noncoincident loads will be used simultaneously.
true
Which of the following service is NOT permitted for additional service to a building?
underground service
