A typical three way switch will have you guessed it three terminals. Its pretty standard in boat wiring to bypass the main battery switch for one thing.
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Typical 3 way switch diagram. This is where the travelers are connected. With a pair of 3 way switches either can make or break the connection that completes the circuit to the light. The boats bilge pump float switch. 3 way switch wiring diagram. Click the icons below to get our nec compliant electrical calc elite or electric toolkit available for android and ios. Take a closer look at a 3 way switch wiring diagram.
This way even if your battery switch is off if your boat starts filling with water the pump will still kick on. Pick the diagram that is most like the scenario you are in and see if you can wire your switch. Typical 3 way switch wiring nm cable. The principle is that the switch will have one main input terminal and two output terminals. One ground and 4 circuit terminals divided into two matching pairs called travelers. 3 way switch diagram multiple light between switches 2 pdf 79kb back to wiring diagrams home.
With these diagrams below it will take the guess work out of wiring. Step 1 the typical 3 way switch wiring has two screw terminals at one end of the switch. The black line wire connects to the common terminal of the first 3 way switch. This might seem intimidating but it does not have to be. Traveler wires are interchangeable. Each pair of traveler terminals should be wired to the traveler wires from one of the 3 way switches in the circuit.
A 4 way switch has five terminals. A 3 wire nm connects the traveler terminals of the first and second 3 way switch together. The electrical calc elite is designed to solve many of your common code based electrical calculations like wire sizes voltage drop conduit sizing etc. In other words the current will always flow. Wiring a 3 way light switch. In the diagram below a 2 wire nm cable supplies power from the panel to the dimmer boxthe black line wire connects to the common terminal of the 3 way dimmera 3 wire nm connects the travelers of the dimmer to the travelers of the 3 way switchtraveler wires are interchangeable on each switch.
Wiring a 3 way light switch is certainly more complicated than that of the more common single pole switch but you can figure it out if you follow our 3 way switch wiring diagram. See the description of each one of them below. In the 1st diagram below a 2 wire nm cable supplies power from the panel to the first switch box. In each position onoff the switch will connect the input to only one of the outputs. Take a look at a typical 3 way dimmer switch installation click on the images to enlarge instructions for dimmer switch wiring. A 4 way switch must be wired between two 3 way switches as shown in the diagrams on this page.
Id rather have a dead battery than a swamped boat.
Gallery of Typical 3 Way Switch Diagram
