That way when someone looks at the switch, they know exactly where to find it in the wiring diagram The switch would be labeled 301SW1 in the field. So if we had a second switch it would be labeled 301SW2. That means it is on Rung 301, it is a switch (SW), and usually there will be a number that increments by one from left to right. Looking at Rung 301, you have a switch labeled 301SW1. Everyone does it a little bit different but once you understand the basics it only takes a few minutes of examining most sets or drawings to follow them. So, in this case, the three probably represents page 3, then you are looking at Rung 01 and 02. These usually increment by one as you go down the page and may incorporate the page number into the rung number. Our power source L1 and N are running vertically as you have learned and now you have added rung numbers to the left of the ladder for reference. Also devices that may span multiple locations in a drawing such as a relay coil and its contacts can easily be cross referenced.įor example, study the diagram to the right. The next key advantage of ladder wiring diagrams over drawing circuits is the way they are physically laid out so that they are indexable, meaning device names can give you the page and rung number that the device can be found on in the ladder wiring diagrams. This will become clearer when you begin working with our control panel sample wiring diagrams in the exercises below. The power source, if external to the drawings, is usually not shown. In single phase diagrams L1 will run down the left side of the page and N or L2 will run down the right side of the page. Usually, if it is three phase then L1, L2, and 元 run down the left side of the page and if there is a neutral (N) then it runs down the right side of the page. As you draw out these circuits the diagrams begin to take the shape of a ladder which is where ladder diagrams get their name. Then circuits off of it such as our switch/light run horizontally on "rungs". So to simplify this, your power wires, in this case L1 and N, run vertically down the page.
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