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Basic electricity for HVACR technicians

from Contracting Business

There are three basic types of wiring diagrams used in the HVACR industry today. The first, and most common, is the ladder diagram, in which symbols represent various components in the circuit and lines represent the wires connecting them. A line diagram usually includes drawings that more closely resemble the components themselves, rather than symbols. An installation diagram is a tool that's used primarily by the installing contractor. more

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