NEC Part 2: CalculationsLesson 522.525

Big picture design considerations Purpose of these calculations1. Max system voltage2. dc calculations

a. max voltage and currentb. conductor sizing (ampacity)c. overcurrent device sizingd. voltage drope. Conduit sizing

3. ac calculations

Overview

1. What is the purpose of PV system?2. What will be the size of the system?3. What components will you be using? 4. How will the system be interconnected with the

grid?5. What is the budget?6. Major design parameters (roof? ground?

tracking?)

NEC calculations mostly done AFTER these big decisions on design are already made

Before doing any calculations, review these “Big Picture” Considerations

Get you “into the weeds” in PV system design

Familiarize you with terminology, locations of important tables in the NEC

Go to word document: NEC Calculation Notes ver 3

Purpose of these Calculations