Carpentry & Building ConstructionChapter 30:
MechanicalsChapter SummariesSection 30.1 The Plumbing System
A basic plumbing system consists of a supply side and a DWV side. Supply pipes are pressurized, while DWV pipes are not. Traps are simple devices that prevent sewer gases from entering the house. Section 30.2 The Electrical System
An electrical system consists of wires, called conductors, which lead from circuit breakers in a service panel to individual outlet boxes. Each set of wires connected to a circuit breaker is called a circuit and leads to a particular portion of the house. Section 30.3 HVAC Systems
Heating systems are classified according to how they distribute heat, not by what fuel they use to create it. Air-conditioning systems are sometimes incorporated with forced-air heating systems so that they can use the same ducts.  | 
