Article 230 (5pg 52q) Flashcards
a building or structure shall be supplied by a maximum of _____ service(s), unless specifically permitted otherwise
one
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
additional services shall be permitted for different voltages, frequencies, or phases, or for different uses such as for _______
different rate schedules
where a building or structure is supplied by more than one service, a permanent plaque or directory shall be installed at each service disconnect location denoting all other services supplying that building or structure and the area serves by each
TRUE
service conductors supplying a building or other structure shall not ______ of another building or other structure
pass through the interior
conductors are considered outside a building when they are installed
-under not less than 2 in of concrete beneath a building or structure
-within a building or structure in a raceway encased in not less than a 2 in. thickness of concrete or brick
-installed in a vault that meets the construction requirements of Article 450
-conductors other than service conductors shall not be installed in the same
-service raceway
-service cable
where a service raceway enters a building or structure from a(n) ________, it shall be sealed in accordance with 300.5(G)
underground distribution system
service conductors installed as unjacketed multi-conductor 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
overhead service conductors to a building shall maintain a vertical clearance of final spans above, or within, _______ measured horizontally from the platforms, projections, or surfaces from which they might be reached.
3 feet
service conductors shall not be installed beneath openings through which materials may be moved and shall not be installed where they will obstruct entrance to these buildings’ openings
TRUE
overhead service conductors spans can be supported to hardwood trees
FALSE
service-drop conductors shall have ___________
-sufficient ampacity to carry the load
-adequate mechanical strength
the minimum size service-drop conductor permitted is _____ AWG copper or _______ AWG aluminum or copper-clad aluminum
8, 6
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
if a set of 120/240 V service-drop conductors terminates at a through-the-roof raceway or approved support, with less than 6 feet of these conductors passing over the roof overhand, the minimum clearance above the roof for these service conductors shall be _______.
18 inch
the requirement to maintain a 3 feet 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
service-drop conductors shall have a minimum of _____ vertical clearance from final grade over residential property and driveways, as well as over commercial areas not subject to truck traffic where the voltage is limited to 300 volts-to-ground
12 feet
the minimum clearance for service-drop conductors not exceeding 60V that pass over commercial areas subject to truck traffic is _________
18 feet
overhead service-drop conductors shall have a horizontal clearance of ______ from a pool
10 feet
the minimum point of a attachment of the service-drop conductors to a building shall not be less than _______ above finished grade
10 feet
where raceay-type service masts are used, all raceway fittings shall be _______ for use with service masts.
identified
service-lateral conductors shall have_____
-adequate mechanical strength
-sufficient ampacity for the loads calculated
underground copper service-lateral conductors shall not be smaller than ______ AWG copper
4
230.31
service-lateral conductors that supply power to limited loads of a single branch circuit shall not be smaller than _________
12 AWG copper
service-entrance conductors shall be sized not less than _____ percent of the continuous load, plus 100 percent of the noncontinuous load
125
writing methods permitted for service-entrance conductors include _____
-rigid metal conduit
-electrical metallic tubing
-PVC conduit
underground service conductors shall be protected against physical damage
TRUE
service cables, where subject to physical damage, shall be protected by _______
-rigid metal conduit
