Example of a Common Question
Here’s a perfect example of an issue that came up today: Someone was editing a drawing they had been given, and the wires were simply drawn running into each other—without a node (dot) to show a connection. In another place, the drawing used an angled tee connection symbol instead. This confused them because they have never seen angle tees. Below is how I explained it to them, and I thought it would be helpful to share here as well. Understanding Nodes and Wire Junctions in Schematics In schematic diagrams, a circular dot at the intersection of two or more wires is called a node or junction. It explicitly indicates an electrical connection. Sometimes, you’ll also see an angled tee section symbol. This is another way to represent a wire junction, and it is often used when the wiring sequence is important. The orientation of this symbol tells the electrician or panel builder the exact order in which wires should be connected. I’ve attached three example snapshots. All three are valid, but each communicates your wiring intent a little differently. --- Example 1 – Clear, Step-by-Step Guidance This method is very direct and leaves little room for misinterpretation. * Wire from terminal 861341 to pin 11 on relay CR86138. * Add a second wire (or preferably a jumper, when allowed) from pin 11 to pin 21. * On the right side, do the same—jumper between the two contacts on the selector switch. * Finally, run a single wire from the switch to terminal 861352. This approach clearly communicates your intent and avoids confusion. --- Example 2 – Traditional, But Risky (In My Humble Opinion) This is the most common traditional style and can be drawn slightly faster, but it leaves too much interpretation up to the panel builder. * The intent is still to wire from terminal 861381 to pin 11 of relay CR86139 , then jumper to pin 21. * However, because the jumper isn’t explicitly shown, a less experienced builder might interpret this as two separate wires from the terminal —one to pin 11, and another to pin 21.