PC Installation Techniques 3

Question 1

When connecting a gas dryer to a flexible gas connector, what is the maximum allowable length of the connector?

Accepted Answer

6 feet

Answer

Flexible gas appliance connectors are limited to a maximum length of 6 feet by ANSI Z21.24 and most fuel gas codes to limit risk in case of damage.

Question 2

A 3-inch sanitary tee is being installed in a horizontal drain line. Which direction must the branch outlet face?

Accepted Answer

Upward, toward the ceiling

Answer

A sanitary tee installed in a horizontal drain line must have its branch facing upward (vertical) to serve as a vent connection; it cannot be used for a horizontal drain branch.

Question 3

What type of flux is recommended for use with lead-free solder on potable water copper pipe?

Accepted Answer

Water-soluble lead-free flux

Answer

Water-soluble, lead-free flux is required for potable water copper pipe connections to comply with the Safe Drinking Water Act and avoid contaminating the water supply.

Question 4

When installing a water heater in a garage, the ignition source of the water heater must be elevated a minimum of how many inches above the floor?

Accepted Answer

18 inches

Answer

Water heater ignition sources in garages must be elevated at least 18 inches above the floor to keep them above potential accumulations of heavier-than-air flammable vapors.

Question 5

Which tool is used to expand PEX-A tubing ends before inserting a fitting?

Accepted Answer

PEX expansion tool (expander)

Answer

PEX-A uses the expansion (ProPEX) method where a special expansion tool expands the tube and fitting ring before the tube contracts back to grip the fitting.

(PC) Plumber Certification Practice Test

(PC) Plumber Certification Practice Test

PC Installation Techniques 3