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A wiring diagram is a convenient way of showing which components are present in an appliance, and how those components are connected together electrically.

Just as a road map helps you to get where you’re going, a wiring diagram helps you follow current flow and identify problems.

It is important to realize that wiring diagrams, or “schematics,” identify electrical connections and current flow, but they do not represent actual locations, distances apart, or component placement (unless noted on the drawing). Nor are they drawn to scale. They do tell you what components are used and how the electricity should flow.

Wiring Diagram Terms

Term

Definition

N.O.

Normally Open

N.C.

Normally Closed

COM

Common Terminal

L1

Hot Side of 120 or 240 VAC Electrical Circuit (usually BK)

L2

Hot Side of 240 VAC Electrical Circuit (usually R)

N

Neutral Line (usually W)

GND

Chassis Ground (usually G)

S.P.S.T.

Single Pole Single Throw Switch

S.P.D.T.

Single Pole Double Throw Switch

LF

Left Front

RF

Right Front

CR

Center Rear

LR

Left Rear

RR

Right Rear

P1-3

Connector Plug and Terminal Designator (e.g. Connector P1-Terminal 3)

DLB

Double Line Break Relay

Matt Zieminski

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