MASSACHUSETTS 248 CMR 10.00 PLUMBING CODE
QUESTIONS WITH DETAILED VERIFIED AND 100%
ACCURATE ANSWERS
Dead End Correct Answers 2' length of pipe capped or plugged off a
branch of plumbing system.
Circuit Vent Correct Answers Not less than 2 yet no more than 8 floor
mounted fixtures that are battery wasted in which a vent extends off the
horizontal waste branch before last fixture & connects to vent on the
upstream.
Individual water supply Correct Answers Water supply independent
from city water such as a well.
Siphon breaker Correct Answers Valve or device that prevents
backflow.
Vent stack Correct Answers Vertical through the roof with vent
branches entering at different floor heights.
Min. Air pressure test in water piping. Correct Answers 125 p.s.i.g
Height of riser in water test of drainage system Correct Answers 10' of
head
Min. pitch on 3" or less drainage pipe Correct Answers 1/4" per foot
,Min. pitch on 4" or more drainage pipe Correct Answers 1/8" per foot
2 locations in drainage system short pattern 90* can be used Correct
Answers Soil & waste lines when direction of flow changes from
horizontal to vertical.
May a sission joint be used in plumbing system? Correct Answers
Negative
When backfilling how deep shall layer of loose earth be? Correct
Answers 6" of loose earth
4 items that shall never enter plumbing system Correct Answers Gas,
oil, sand, or hazardous materials
5 places grease interceptor must be installed Correct Answers
Restaurant, cafeteria, grocery store, prison, bar where food is served.
Minimum size of vent stack or stack vent Correct Answers 3" minimum
stack
Minimum sized drain pipe under concrete floor Correct Answers 2"
minimum drain under concrete floor
, Minimum sized sanitary drain through foundation wall Correct Answers
4" minimum sanitary drain
Can two piece trap be used instead of cleanout? Correct Answers Yes,
two piece trap equivalent to clean out
Where can bow vents be found? Correct Answers Kitchen island sink
Can a vent be pulled off below trap weir? Correct Answers Yes, under
anything with an integral trap
How is the trap seal protected? Correct Answers By use of vents
If three 4" vents are connected together what size is vent header?
Correct Answers 5" header
If four or more 4" vents are connected together what size is vent header?
Correct Answers 6" header
Vents through roof shall be how high above fresh air intake? Correct
Answers Two feet above the top of opening
Minimum sized vent through the roof? Correct Answers Minimum 2"
vent through roof
QUESTIONS WITH DETAILED VERIFIED AND 100%
ACCURATE ANSWERS
Dead End Correct Answers 2' length of pipe capped or plugged off a
branch of plumbing system.
Circuit Vent Correct Answers Not less than 2 yet no more than 8 floor
mounted fixtures that are battery wasted in which a vent extends off the
horizontal waste branch before last fixture & connects to vent on the
upstream.
Individual water supply Correct Answers Water supply independent
from city water such as a well.
Siphon breaker Correct Answers Valve or device that prevents
backflow.
Vent stack Correct Answers Vertical through the roof with vent
branches entering at different floor heights.
Min. Air pressure test in water piping. Correct Answers 125 p.s.i.g
Height of riser in water test of drainage system Correct Answers 10' of
head
Min. pitch on 3" or less drainage pipe Correct Answers 1/4" per foot
,Min. pitch on 4" or more drainage pipe Correct Answers 1/8" per foot
2 locations in drainage system short pattern 90* can be used Correct
Answers Soil & waste lines when direction of flow changes from
horizontal to vertical.
May a sission joint be used in plumbing system? Correct Answers
Negative
When backfilling how deep shall layer of loose earth be? Correct
Answers 6" of loose earth
4 items that shall never enter plumbing system Correct Answers Gas,
oil, sand, or hazardous materials
5 places grease interceptor must be installed Correct Answers
Restaurant, cafeteria, grocery store, prison, bar where food is served.
Minimum size of vent stack or stack vent Correct Answers 3" minimum
stack
Minimum sized drain pipe under concrete floor Correct Answers 2"
minimum drain under concrete floor
, Minimum sized sanitary drain through foundation wall Correct Answers
4" minimum sanitary drain
Can two piece trap be used instead of cleanout? Correct Answers Yes,
two piece trap equivalent to clean out
Where can bow vents be found? Correct Answers Kitchen island sink
Can a vent be pulled off below trap weir? Correct Answers Yes, under
anything with an integral trap
How is the trap seal protected? Correct Answers By use of vents
If three 4" vents are connected together what size is vent header?
Correct Answers 5" header
If four or more 4" vents are connected together what size is vent header?
Correct Answers 6" header
Vents through roof shall be how high above fresh air intake? Correct
Answers Two feet above the top of opening
Minimum sized vent through the roof? Correct Answers Minimum 2"
vent through roof
