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NC PLUMBING CODE, FUEL GAS, AND
BUSINESS EXAM PREP QUESTIONS WITH
DETAILED VERIFIED ANSWERS
Licenses expires when? Ans: Last Day of December
how many days in a work week Ans: 168
when license expires you have to pay within how long before you have to
retake exam Ans: WITHIN 3 years or 1094 days
osha form 300 A has to be posted by when Ans: feb 1st- april 30th
what does flux do? Ans: thermally assist with heat transfer
Physically helps in removal of metal oxides
how many feet must the city sewer tap be in order to have a choice of
the way the homeowner can run his/her sewer Ans: when 200 feet away
from the dwelling the homeowner can either have septic or city
what gas is put off when soldering copper Ans: Hydrogen Chloride
how many gallons is 1 DFU Ans: 7.5 gallons of water
blue is what type of copper Ans: type L
red is what type of copper Ans: Type M
yellow is what type of copper Ans: DWV
green is what type of copper Ans: type K which is the thickest type
to be considered a loop vent what is it tied in with? Ans: loop vent is
tied in with Stack Vent
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to be considered a circuit vent what is it tied in with? Ans: circuit vent is
tied in with the vent stack
how many members is on the board of examiners and how many times
do they meet a year Ans: 7 members and twice a year
how much can they charge for license and what is the max Ans: the
state can charge 130 but not exceed 150$
must file a lien within how many days Ans: within 120 days
what page starts the plumbing definitions in the PLBG code book Ans:
starts at page 6
def of bathroom group? Ans: a group of fixtures consisting of water
closet, lavatory, bathtub or shower, such fixtures are located together on
the same floor and no door closes off one or the other
def of battery fixtures Ans: any group of two or more similar adjacent
fixtures that discharge into a common horizontal waste or soil branch
def of a branch interval Ans: a distance along a soil or waste stack
corresponding in general to a story height but not less than 8 feet
where does building drain end? Ans: 10 feet outside of the house
where does building sewer start Ans: after 10 feet from the house
def of the fixture drain Ans: the drain from the trap of a fixture to a
junction with any other drain pipe
what does DFU stand for Ans: Drainage Fixture Unit
what temp must the line be to be considered hot water Ans: water at a
temperature greater than 110 degrees is considered a hot water line
at what point does the water service pipe stop Ans: the water service
pipe shall terminate 5 feet outside the foundation wall
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can floor drains or sump pumps go beneath an elevator shaft? Ans: yes
but they must be indirectly connected to the plumbing system
all strainer plates must have openings that don't exceed what? Ans: all
openings must not exceed 1/2 inch for rodent proofing
what size must a sleeve be for 3 inch pipe? Ans: 4 inches the sleeve
must be 2 pipe sizes larger and must be sealed on both sides
to insure that the water supply doesn't freeze where must the pipe be
under ground and what size insulation in the attic Ans: must be installed
no less than 6 inches below the frost line and not less than 12 inches
below grade and must have R6.5 insulation if installed in a unheated area
such as the attic
how deep must the sewer be when installed under ground Ans: no less
than 3 inches below grade
test and inspections begins on what page Ans: page 19 in the plbg code
book
minimum number of required plbg fixtures Chart for sizing schools and
other buildings begins on what page Ans: page 24
where must toilet facilities be in a mall Ans: path of travel shall not
exceed 300 feet
the max design class sizes for grades k through 8 are how many students
Ans: 29 students
the max design class sizes for grades 9-12 are how many students Ans:
33 students
how much clearance must you have in front of any W/C, urinal, lavatory,
or bidet to any wall fixture or door Ans: shall not be less than 21 inch
clearance
installation of fixtures begins on what page? Ans: page 29
NC PLUMBING CODE, FUEL GAS, AND
BUSINESS EXAM PREP QUESTIONS WITH
DETAILED VERIFIED ANSWERS
Licenses expires when? Ans: Last Day of December
how many days in a work week Ans: 168
when license expires you have to pay within how long before you have to
retake exam Ans: WITHIN 3 years or 1094 days
osha form 300 A has to be posted by when Ans: feb 1st- april 30th
what does flux do? Ans: thermally assist with heat transfer
Physically helps in removal of metal oxides
how many feet must the city sewer tap be in order to have a choice of
the way the homeowner can run his/her sewer Ans: when 200 feet away
from the dwelling the homeowner can either have septic or city
what gas is put off when soldering copper Ans: Hydrogen Chloride
how many gallons is 1 DFU Ans: 7.5 gallons of water
blue is what type of copper Ans: type L
red is what type of copper Ans: Type M
yellow is what type of copper Ans: DWV
green is what type of copper Ans: type K which is the thickest type
to be considered a loop vent what is it tied in with? Ans: loop vent is
tied in with Stack Vent
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to be considered a circuit vent what is it tied in with? Ans: circuit vent is
tied in with the vent stack
how many members is on the board of examiners and how many times
do they meet a year Ans: 7 members and twice a year
how much can they charge for license and what is the max Ans: the
state can charge 130 but not exceed 150$
must file a lien within how many days Ans: within 120 days
what page starts the plumbing definitions in the PLBG code book Ans:
starts at page 6
def of bathroom group? Ans: a group of fixtures consisting of water
closet, lavatory, bathtub or shower, such fixtures are located together on
the same floor and no door closes off one or the other
def of battery fixtures Ans: any group of two or more similar adjacent
fixtures that discharge into a common horizontal waste or soil branch
def of a branch interval Ans: a distance along a soil or waste stack
corresponding in general to a story height but not less than 8 feet
where does building drain end? Ans: 10 feet outside of the house
where does building sewer start Ans: after 10 feet from the house
def of the fixture drain Ans: the drain from the trap of a fixture to a
junction with any other drain pipe
what does DFU stand for Ans: Drainage Fixture Unit
what temp must the line be to be considered hot water Ans: water at a
temperature greater than 110 degrees is considered a hot water line
at what point does the water service pipe stop Ans: the water service
pipe shall terminate 5 feet outside the foundation wall
, Page | 3
can floor drains or sump pumps go beneath an elevator shaft? Ans: yes
but they must be indirectly connected to the plumbing system
all strainer plates must have openings that don't exceed what? Ans: all
openings must not exceed 1/2 inch for rodent proofing
what size must a sleeve be for 3 inch pipe? Ans: 4 inches the sleeve
must be 2 pipe sizes larger and must be sealed on both sides
to insure that the water supply doesn't freeze where must the pipe be
under ground and what size insulation in the attic Ans: must be installed
no less than 6 inches below the frost line and not less than 12 inches
below grade and must have R6.5 insulation if installed in a unheated area
such as the attic
how deep must the sewer be when installed under ground Ans: no less
than 3 inches below grade
test and inspections begins on what page Ans: page 19 in the plbg code
book
minimum number of required plbg fixtures Chart for sizing schools and
other buildings begins on what page Ans: page 24
where must toilet facilities be in a mall Ans: path of travel shall not
exceed 300 feet
the max design class sizes for grades k through 8 are how many students
Ans: 29 students
the max design class sizes for grades 9-12 are how many students Ans:
33 students
how much clearance must you have in front of any W/C, urinal, lavatory,
or bidet to any wall fixture or door Ans: shall not be less than 21 inch
clearance
installation of fixtures begins on what page? Ans: page 29
