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Al Whitley/1 min read

Understanding Electrical Schedules: Analyzing Circuits and Panel Boxes in Buildings

Construction Estimating Workflow

1

Quantity Takeoff

Count or measure every item — doors, walls, finishes.

2

Apply Unit Costs

Material + labor per unit from a cost database.

3

Add Overhead & Profit

Standard markups for project conditions.

4

Document Assumptions

Bid clarifications protect against scope disputes later.

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This tutorial walks through understanding electrical schedules: analyzing circuits and panel boxes in buildings, covering essential tools and techniques for your projects.

Let's review our electrical schedules. When you look at the page, you can see that there are 16 sets of information that are all fundamentally identical. And what they're showing is which circuits are connected to which panel boxes in a building.

From a big-picture standpoint, you can see that the panels are numbered. Now let’s zoom into this area. So here's the panel number.

You can see the circuit numbers on the left. Circuit numbers are also shown in the middle. If you've ever looked inside the panel box at your house, you will see something just like this.

We have the circuit numbers on the left, circuit numbers in the middle, and we can see the breaker numbers.

We can see where they are connected, the KVA load factors, overall load calculations, and total KVA demand on this panel box. Again, this is the type of information provided for every load center within the building. It’s always presented in the drawings, and similar labeling appears on the inside of the panel boxes also.

So please feel free to spend a few minutes zooming in and observing the similarities between all of the different panel boxes.