MASSACHUSETTS 248 CMR 10.00 PLUMBING CODE
QUESTIONS WITH DETAILED VERIFIED AND 100%
ACCURATE ANSWERS ALREADY GRADED A+
Dead End - (ANSWER)2' length of pipe capped or plugged off a branch of plumbing system.
Circuit Vent - (ANSWER)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 - (ANSWER)Water supply independent from city water such as a well.
Siphon breaker - (ANSWER)Valve or device that prevents backflow.
Vent stack - (ANSWER)Vertical through the roof with vent branches entering at different floor heights.
Min. Air pressure test in water piping. - (ANSWER)125 p.s.i.g
Height of riser in water test of drainage system - (ANSWER)10' of head
Min. pitch on 3" or less drainage pipe - (ANSWER)1/4" per foot
Min. pitch on 4" or more drainage pipe - (ANSWER)1/8" per foot
2 locations in drainage system short pattern 90* can be used - (ANSWER)Soil & waste lines when
direction of flow changes from horizontal to vertical.
May a sission joint be used in plumbing system? - (ANSWER)Negative
,MASSACHUSETTS 248 CMR 10.00 PLUMBING CODE
QUESTIONS WITH DETAILED VERIFIED AND 100%
ACCURATE ANSWERS ALREADY GRADED A+
When backfilling how deep shall layer of loose earth be? - (ANSWER)6" of loose earth
4 items that shall never enter plumbing system - (ANSWER)Gas, oil, sand, or hazardous materials
5 places grease interceptor must be installed - (ANSWER)Restaurant, cafeteria, grocery store, prison, bar
where food is served.
Minimum size of vent stack or stack vent - (ANSWER)3" minimum stack
Minimum sized drain pipe under concrete floor - (ANSWER)2" minimum drain under concrete floor
Minimum sized sanitary drain through foundation wall - (ANSWER)4" minimum sanitary drain
Can two piece trap be used instead of cleanout? - (ANSWER)Yes, two piece trap equivalent to clean out
Where can bow vents be found? - (ANSWER)Kitchen island sink
Can a vent be pulled off below trap weir? - (ANSWER)Yes, under anything with an integral trap
How is the trap seal protected? - (ANSWER)By use of vents
If three 4" vents are connected together what size is vent header? - (ANSWER)5" header
If four or more 4" vents are connected together what size is vent header? - (ANSWER)6" header
, MASSACHUSETTS 248 CMR 10.00 PLUMBING CODE
QUESTIONS WITH DETAILED VERIFIED AND 100%
ACCURATE ANSWERS ALREADY GRADED A+
Vents through roof shall be how high above fresh air intake? - (ANSWER)Two feet above the top of
opening
Minimum sized vent through the roof? - (ANSWER)Minimum 2" vent through roof
How far away must vents be from fresh air intake? - (ANSWER)Minimum 10' away from fresh air intake.
At what height may a vent run horizontal? - (ANSWER)6" above the flood level rim
When wet venting, what is minimum size of vent? - (ANSWER)2" minimum wet vent
Maximum distance between two branches when common venting - (ANSWER)10" center to center
What is smallest sized vent installed for a 6" trap? - (ANSWER)Half the size of the drain it connects to.
Where must future vent be installed in every building? - (ANSWER)Basement
May air admittance valves be installed? - (ANSWER)Only with special permission from the board &
installed in accord to manufacturer's specs
Why are interceptors & separators needed - (ANSWER)To prevent the discharge of hazardous materials
into plumbing system
QUESTIONS WITH DETAILED VERIFIED AND 100%
ACCURATE ANSWERS ALREADY GRADED A+
Dead End - (ANSWER)2' length of pipe capped or plugged off a branch of plumbing system.
Circuit Vent - (ANSWER)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 - (ANSWER)Water supply independent from city water such as a well.
Siphon breaker - (ANSWER)Valve or device that prevents backflow.
Vent stack - (ANSWER)Vertical through the roof with vent branches entering at different floor heights.
Min. Air pressure test in water piping. - (ANSWER)125 p.s.i.g
Height of riser in water test of drainage system - (ANSWER)10' of head
Min. pitch on 3" or less drainage pipe - (ANSWER)1/4" per foot
Min. pitch on 4" or more drainage pipe - (ANSWER)1/8" per foot
2 locations in drainage system short pattern 90* can be used - (ANSWER)Soil & waste lines when
direction of flow changes from horizontal to vertical.
May a sission joint be used in plumbing system? - (ANSWER)Negative
,MASSACHUSETTS 248 CMR 10.00 PLUMBING CODE
QUESTIONS WITH DETAILED VERIFIED AND 100%
ACCURATE ANSWERS ALREADY GRADED A+
When backfilling how deep shall layer of loose earth be? - (ANSWER)6" of loose earth
4 items that shall never enter plumbing system - (ANSWER)Gas, oil, sand, or hazardous materials
5 places grease interceptor must be installed - (ANSWER)Restaurant, cafeteria, grocery store, prison, bar
where food is served.
Minimum size of vent stack or stack vent - (ANSWER)3" minimum stack
Minimum sized drain pipe under concrete floor - (ANSWER)2" minimum drain under concrete floor
Minimum sized sanitary drain through foundation wall - (ANSWER)4" minimum sanitary drain
Can two piece trap be used instead of cleanout? - (ANSWER)Yes, two piece trap equivalent to clean out
Where can bow vents be found? - (ANSWER)Kitchen island sink
Can a vent be pulled off below trap weir? - (ANSWER)Yes, under anything with an integral trap
How is the trap seal protected? - (ANSWER)By use of vents
If three 4" vents are connected together what size is vent header? - (ANSWER)5" header
If four or more 4" vents are connected together what size is vent header? - (ANSWER)6" header
, MASSACHUSETTS 248 CMR 10.00 PLUMBING CODE
QUESTIONS WITH DETAILED VERIFIED AND 100%
ACCURATE ANSWERS ALREADY GRADED A+
Vents through roof shall be how high above fresh air intake? - (ANSWER)Two feet above the top of
opening
Minimum sized vent through the roof? - (ANSWER)Minimum 2" vent through roof
How far away must vents be from fresh air intake? - (ANSWER)Minimum 10' away from fresh air intake.
At what height may a vent run horizontal? - (ANSWER)6" above the flood level rim
When wet venting, what is minimum size of vent? - (ANSWER)2" minimum wet vent
Maximum distance between two branches when common venting - (ANSWER)10" center to center
What is smallest sized vent installed for a 6" trap? - (ANSWER)Half the size of the drain it connects to.
Where must future vent be installed in every building? - (ANSWER)Basement
May air admittance valves be installed? - (ANSWER)Only with special permission from the board &
installed in accord to manufacturer's specs
Why are interceptors & separators needed - (ANSWER)To prevent the discharge of hazardous materials
into plumbing system
