424.1 Worksheet
Disregarding exceptions, all 3-phase, 277/480-volt, wye electrical services require ground-fault protection for each service disconnecting means when rated for ___ amps or more.
1,000
For a one-family dwelling, the service disconnecting means shall have a rating of not less than ___ amperes, 3-wire.
100
The minimum feeder-circuit conductor size, before the application of any adjustment or correction factors, shall have an allowable ampacity equal to or greater than the noncontinuous load plus ___ percent of the continuous load.
125
Where it is impracticable to locate the service head above the point of attachment, the service head location shall be permitted no further than ___ from the point of attachment.
2'
Communications conductors shall be mounted not less than ___ inches below power conductors rated over 300 volts supported on poles.
30
Without exceptions, the minimum size service lateral conductors allowed by the NEC ® is ___.
8 AWG copper
Where exposed to the weather, raceways enclosing service-entrance conductors shall be ___. I. Suitable for use in wet locations II. arranged to drain III. racked
I & II only
Service entrance cables, where subject to physical damage, shall be protected when installed in ___. I. EMT II. IMC III. RMC
I, II & III
A(An) ___ is considered to be service equipment by the NEC ®. I. individual meter socket enclosure II. service disconnecting means III. panelboard
II & III only
Conductors shall be considered outside a building where installed ___. I. in a raceway II. within a building in a raceway enclosed by 2" of brick III. under not less than 2" of concrete beneath a building
II & III only
Where more than one building or other structure is on the same property and under single management, each building or other structure served shall be provided with means for disconnecting all ___ conductors located nearest the point of entrance of the supply conductors. I. grounded II. ungrounded
II only
If the service disconnecting means is located inside a residence, it shall be located ___ the point of entrance of the service conductors.
at a point nearest
In a multiple-occupancy building, each occupant shall have access to its own service ___.
disconnecting means
Two or three single-pole switches or breakers, capable of individual operation, shall be permitted on multiwire circuits, one pole for each ungrounded conductor, as one multipole disconnect provided they are equipped with ___ to disconnect all conductors of the service with no more than six operations of the hand. I. a master handle II. identified handle ties
either I or II
Service conductors are the conductors from the service point to the ___.
service disconnecting means
Where necessary to prevent ___, an automatic overcurrent device protecting service conductors supplying only a specific load, such as a water heater, shall be permitted to be locked or sealed where located so as to be accessible.
tampering
A building is provided with two sets of service-drop conductors from the utility pole. One service drop is 120/240-V for lighting and receptacle loads, and the other service is 480-V to supply motor loads. How many disconnecting means are permitted for this building?
twelve
Each ___ service conductor shall have overload protection.
ungrounded
