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NEC Calculation Requirements, Part 16

NEC Calculation Requirements, Part 16

In this series, we looked at which NEC requirements affect circuit calculations. Notice, we never said the NEC determines what size your conductors should be. It won’t do your engineering for you and explain how to optimally size conductors. All it does is does is provide the framework for determining the minimum size conductors must […]

NEC Calculation Requirements, Part 15

NEC Calculation Requirements, Part 15

In this series, we’ve been looking at which NEC requirements affect circuit calculations. In our previous issue, we looked at the effects of Article 220 (calculations for services, feeders, and branch-circuits) on calculations. Article 225 affects circuit calculations only indirectly. Article 230 (Services) presents us with a bit of an anomaly. What is that, you […]

NEC Calculation Requirements, Part 14

NEC Calculation Requirements, Part 14

In this series, we’ve been looking at how the NEC affects your calculations. We started at the beginning and finished with Article 215 in our previous issue. That brings us to Article 220, which is all about calculations for services, feeders, and branch-circuits. We won’t go through each requirement. But this overview will be helpful. […]

NEC Calculation Requirements, Part 13

NEC Calculation Requirements, Part 13

Previously, we discussed the few ways Article 215 affects your calculations. But we didn’t discuss the fact that it’s often difficult to tell if you actually have an Article 215 application. In a simple layout, it’s not an issue. For example, your service switchgear is near the service entrance, which is supplied by the utility’s […]

NEC Calculation Requirements, Part 12

NEC Calculation Requirements, Part 12

In the previous issue, we started to look at the few ways Article 215 affects your calculations. We left off with the 125% rule presented in 215(A)(1). This same rule is presented in 215.3 for sizing overcurrent protection devices. The other Article 215 requirements that could affect your calculations are in Subsection 215, which is […]