Electrical Installation Design Guide Calculations For Electricians And Designers Pdf

[Leanne Wittlin]

Lastsummer I spent a whole weekend mapping out all of the circuits in my house. I did it myself and made a whole lot of steps going from the electrical panel to every part of the house, flipping breakers and switches.

On the right side is a double 30 amp breaker at the top, another double 30 amp breaker in the middle, and then a single 20 amp breaker at the bottom. They protect the heat pump water heater, the electric cooktop in the basement, and lights and outlets on the back side of the house.

The easy version of the old-fashioned way to do it would be to have two people talking to each other from different parts of the house. One will stay at the panel, turning breakers on and off. The other person will go to each room in the house as well as looking at exterior lights as the panel person switches breakers.

You can take this even further, too. Jonathan Porter, an engineer in Minnesota, made a full schematic design of every circuit in his house. It shows every load, cable, junction box, and breaker. Joe Smith, a contractor in California, labeled not only his breakers in the panel but also the switches and receptacles in the house. Dennis Heidner, an engineer in Seattle, drew a schematic layout of his system and labeled the cables, too. How OCD will you be with your circuit mapping?

Allison A. Bailes III, PhD is a speaker, writer, building science consultant, and the founder of Energy Vanguard in Decatur, Georgia. He has a doctorate in physics and is the author of a popular book on building science. He also writes the Energy Vanguard Blog. You can follow him on Twitter at @EnergyVanguard. Photos courtesy of author.

The original labels on my panel only bore a passing resemblance to what they actually served. One very useful thing to do when mapping them is to write the circuit # on the back of the cover-plate for each outlet, switch or junction box you test.

What would be nice if electricians used logic when running circuits and didn't connect unrelated rooms to each other for their own convenience. My house has the lights in the garage, laundry room, and kitchen on the same circuit, along with a couple random outlets including an outdoor outlet. So if i'm running a higher power item outside it can trip that circuit and thus kills the lights. It taught me that when designing houses, to be specific on the electrical plans with how I want the circuits run to ensure areas are logically isolated.

The radio trick is great if you want to find the breaker for one receptacle. But if you want to map out, for example, all the receptacles in the kitchen, that can take a lot of back and forth to the panel.

That's where I think your idea of using the Emporia Vue could make it easier. If you have a medium-size plug-in load, maybe a 100 W light bulb (if you can still buy one of those), you could move it from receptacle to receptacle, seeing which channel it shows up in, without going back and forth. I don't have mine monitoring system (IotaWatt) set up with a large number of channels, but I could move the CTs to the likely candidates for a part of the house, maps those, and move on. You can check the circuits you are monitoring plus one more, but designating the one more by turning it off.

That plan could also work with a clamp meter and some way to display video remotely, whether that's a security camera, a baby monitor, or setting up a zoom meeting between a computer pointed at the meter and your phone.

My final suggestion is that if you make a nice spreadsheet, also print it out and tape it to the wall next to the panel. You might intend to transfer the spreadsheet to the next owner of the house, but there are lots of reasons that might not happen as planned.

When mapping an entire house, having every light on and a visual indicator in each plug ( I use nightlights with the photocell disabled) can reduce the number of trips you make through the house as you shut off each breaker then note what has changed. For outlets that get missed, I might run an extension cord to the panel from the mystery plug with a tester on the end then flip each breaker in sequence to find the source.

Allison is lucky his 1961 house has grounded circuits, the one I grew up in built in 1961 still had ungrounded outlets.

I think rewiring is pretty extreme[as the electrician suggested] . In my current 1970 house we put in a sub panel and all the new stuff went there. When doing a large reno like we did, you are frequently adding GFCI and AFCI breakers so it is convenient to put those in a new box, along with the new 240v stuff

I think as long as your house is in the grounded/circuit breaker era rather than the fusebox ungrounded era, you are usually in pretty good shape

Here is the zero-(foot)steps method to CONFIRM that you have located the breaker with the tester you are using (Klein ET310). When you switch the breaker off, there should no longer be power to the device you plugged into the receptacle! If you still detect a signal at the panel, you've turned off the wrong breaker. If you do this every time you identify a breaker, you can verify the accuracy of the process.

If you have a friend who is an electrical contractor, see if you can borrow her whole-panel identification tool... you put clips on each of your wires in the panel, then move from room-to-room plugging in a device which will indicate which circuit is feeding that receptacle.

Last tip: identifying lighting circuits can (arguably) be made easier with a similar tester (from Gardner Bender). The plug-in part lacks a ground pin, allowing you to use a two-pin lamp/receptacle adapter by screwing the adapter into the light socket (if the light fixture uses the traditional Edison twist-in socket). You're still stuck hauling a ladder around and climbing it twice per fixture. It seems easier to just walk, but perhaps there are situations where it could be preferable.

They break down the whole process in a super simple way, making it easy for even us non-electricians to understand. Plus, they throw in some handy tips and tricks along the way. Cables -and-accessories play a big role in all this, so it's crucial to know what's what. Personally, I've always been a bit clueless when it comes to this stuff, but after reading through this guide, I feel like I could tackle a wiring project without setting the house on fire! Definitely worth checking out if you're thinking about doing any electrical work around the house.

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