Week three
Overhead service conductors accessible only to pedestrian tragic must have a minimum ____ ft vertical clearance above finished grade
10
The ampere rating of any circuit breaker rated at _______ amperes or less and 1000 volts or less must be molded stamped etched or similarly marked into the handle or escutcheon area.
100
Individual household cooking appliances rated more than ___ watts (volt-amperes) can be debated by using demand factors
1750
The lighting load for residential dwelling units is ___ volt amperes (VA) per square foot.
3
A scale ruler is used in ____
Determining the location of outlets
Multiplying voltage by amperage produces _____
Volt-amperes (VA)
A one family dwelling service disconnecting means must have a minimum rating of ______
100 ampere 3-wire
Entrance cable must be supported within ____ in of every raceway or enclosure connection
12
Voltage between overhead conductors does not exceed ___ volts
300
The exact nameplate rating of the clothes dryer even if less than ___ volt amperes should not be used in load calculations
5000
The minimum size grounding electrode conductor is ___ AWG copper ( or 4 AWG aluminum)
6
A clothes dryer neutral load on a feeder can be calculated at ___%
70
A demand factor of ____% can be applied to the nameplate rating load of four or more fastened in place appliances.
75
Conductors must have a vertical clearance of at least ___ ft above the roof surface
8
In outdoor applications ____ grounding electrode inductors must not be installed within 18 inches of the earth
Aluminum (or copper-clad aluminum )
Panel boards include overcurrent devices as well as ______
Buses
Conductor sizes are expressed in American Wire Gage (AWG) or in ____
Circular mils
Working space illumination shall not be ______
Controlled by automatic means only
Main bonding jumpers and system bonding jumpers must be made of ____ or other corrosion-resistant material.
Copper
Panel boards shall be mounted in cabinets clout boxes or identified enclosures and shall be _____
Dead front
Type USE cable used for service laterals can ____
Emerge above ground at outside terminations
Splices in wire type grounding electrode conductors are acceptable only if by me and=s f irreversible compression type connectors (listed as grounding and bonding equipment or by the _____
Exoteric welding process
Circuit breakers and fuses can be connected in parallel provided they are _____
Factory assembled and listed as a unit
No derating is allowed when there are only one two or three appliances
Fastened-in place
Underground service conductors are defined as the underground conductors between the service point and the ________ to the service entrance conductors in a terminal box
First point of connection
The radius of the curve of the inner edge of any bend in service entrance cable must be at least ____ times the diameter of the cable.
Five
The ___ for each floor shall be computed using the outside dimensions.
Floor area
Concrete brick or tile walls are recognized as _______
Grounded
For the purpose of this load calculation the terms neutral and ___ are synonymous.
Grounded
____ are not included in calculating receptacle loads.
Heating and air-conditioning systems
All switchboards switchgear panel boards distribution boards and motor control centers must be located and must be protected from damage
In dedicated spaces
Fuses must be plainly marked by printing on or a label attached to the fuse barrel showing the following 1 ampere rating, 2 voltage rating, 3 _____ 4 "current limiting" where applicable and 5 the name or trademark of the manufacturer
Interrupting rating if other than 10,000 amperes
Each laundry branch circuit is calculated at _____
No less than 1500 volt amperes
Circuit breakers must have a voltage rating clearly marked ____ voltage
No less than the nominal voltage
The smaller of two or more ____ loads can be omitted as long as they are never energized simultaneously.
Noncoineicident
____ are not included in the calculated floor area of dwelling units
Open porches
Fuse holders for current-limiting fuses must not
Permit insertion of non current-limiting fuses
Type ____ cable can be foremd in a gooseneck and taped with a self sealing weather resistant thermoplastic.
SE
A feeder is defined as all circuit conductors between the ____ containing fuses or breakers that feed branch circuits
Service disconnecting means and the panelboard
Two to ____ circuit breakers or sets of fuses are acceptable as the overcurrent device to provide overload protection.
Six
Load calculations must be performed in order to determine the _____
Size and service of feeders
_____ must be included when calculating a dwelling unit service.
Small-appliance branch circuits
Although not stipulated in the NEC some local jurisdictions have adopted ___ for service conductors
Specific distance requirements
_____ is not an important piece of information to gather before performing load calculations.
The location of circuit breakers
The _____ including the strip heat and blower motor is necessary information for calculating loads.
Total volt- ampere load
Wire ways are ____ with hinged or removable covers used to house and protect electric wires and cables.
Troughs (sheet metal or nonmetallic)
A dwelling unit must have at least _____ small appliance branch circuits.
Two
The term appliance designates ___- and installed as a unit to perform specific functions
Utilization equipment commonly built in standardized types and sizes
Total volt ampere load for heating or air conditioning systems is calculated as the largest _____
Volt-ampere load after application of the demand factors
Horsepower ratings use be converted to _____ before they can be added to the load calculation form.
Volt-amperes (VA)
Cartridge fuses and fuse holders are classified according to ______
Voltage and ampere ranges
Service entrance and overhead service d=conductors shall be arranged so that ____
Water shall not enter the service raceways or equipment
