Cleanouts provide access to an individual vent if a stoppage occurs.

A(n) ___ duct system enables large ducts to be close to rooms and round branch ducts to be small, which helps reduce the overall system static pressure drop.

In hydronic heating systems, a circulating pump moves hot water from a boiler through the supply piping system to the terminal devices and back to the boiler.

A ___ lamp is a lamp that produces light from an arc tube.

___ detect a low level of current unbalance between a hot/neutral conductor and ground wire and instantaneously open the circuit in response.

Trap seal loss is virtually eliminated when a(n) ___ vent is employed since the plumbing system is relieved of negative and positive pressure at every fixture trap.

The ___ is the “brain” of the fire protection system and is equipped with a user interface to provide operators with system information.

Apparent power is the actual power used in an electrical circuit.

___ diagrams are used to make repairs, troubleshoot problems, or inspect circuits.

Power companies primarily use 3ϕ transformers connected in different combinations to deliver the correct power to customers.