Master Plumber Exam Philippines Master Plumber Code and Regulations

Question 1

Under the National Plumbing Code of the Philippines (NPCP), what is the minimum trap seal depth required for fixture traps?

Accepted Answer

38 mm (1.5 inches)

Answer

The NPCP requires a minimum trap seal depth of 38 mm (1½ inches) to prevent sewer gases from entering the building.

Question 2

According to the Philippine Sanitation Code (PD 856), what is the minimum distance between a deep well and a septic tank?

Accepted Answer

25 meters

Answer

PD 856 requires a minimum horizontal distance of 25 meters between a deep well and a septic tank to prevent contamination of the water supply.

Question 3

In the NPCP, what is the fixture unit (FU) value assigned to a lavatory (washbasin) for drainage load calculation?

Accepted Answer

1 FU

Answer

A lavatory is assigned 1 fixture unit for drainage load calculations under the NPCP.

Question 4

What does 'PN6' designation mean for PVC pressure pipes used in water supply systems in the Philippines?

Accepted Answer

Pressure Nominal rating of 6 bar (600 kPa)

Answer

PN6 stands for Pressure Nominal 6 bar, meaning the pipe is rated for a maximum working pressure of 600 kPa (approximately 87 psi).

Question 5

Under the NPCP, what is the maximum trap arm length (distance from trap weir to vent) for a 38 mm (1½-inch) drain pipe?

Accepted Answer

1.5 m (5 ft)

Answer

For a 38 mm diameter drain pipe, the maximum trap arm length is 1.5 m (approximately 5 feet) per the NPCP.

Master Plumber Exam Practice Test