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Utility-Scale

Arc Flash Calculations and Insulation Resistance Testing - Self Study

Randy Batchelor and 1 other • Last updated 08/2022

4.6/5 (view ratings)

1222 students

1 module

44 minutes

8 assignments

Course description

In this free lecture, Ryan Mayfield discusses two topics that are critical in the design and installation of large scale commercial installations: DC arc flash and insulation resistance testing.

The lecture includes discussions on the application of NFPA 70E in calculating DC arc faults and the associated hazard risk categories. Sample calculations are provided to illustrate real world examples and applications. The lecture also includes information on insulation resistance testing (IRT) during system commissioning and operations and maintenance activities. Participants will see an IRT procedure applied to help solidify the concepts presented in the lecture.

By the end of the lecture, participants will:

Have an understanding of the arc flash calculations
Recognize various hazard risk categories based on site specific conditions
Be able to evaluate the results provided from insulation resistance testing of conductors
Understand the basic setup procedure for insulation resistance testing

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Full course outline

Module 1 - Video Lecture and Conference Call Recording

In this video lecture, Ryan Mayfield discusses two topics that are critical in the design and installation of large scale commercial installations: DC arc flash and insulation resistance testing. The lecture includes discussions on the application of NFPA 70E in calculating dc arc faults and the associated hazard risk categories. Sample calculations are provided to illustrate real world examples and applications. The lecture also includes information on insulation resistance testing (IRT) during system commissioning and operations and maintenance activities. Participants will see an IRT procedure applied to help solidify the concepts presented in the lecture. On the conference call recording, Ryan responds to participant questions and callers share their insights and perspectives.

Lecture - Arc Flash and Insulation Resistance Testing (44:38 minutes)
1-hour conference call recording (.mp3) (.mp3)
Resources: SP7.2 Arc Flash (.pdf)
Resources: SP5.2 QA Standardizing Documentation (.pdf)
Resources: Arc Flash whitepaper (.pdf)
Free Tool: Mayfield Design Tool

Authors

Randy Batchelor

Principal and Owner, Sol Rebel

Randy Batchelor is a licensed Electrical Engineer in California and is a NABCEP Certified PV Professional. He has experience with projects ranging from small off-grid power systems to utility-scale plants connected at medium Voltage. Randy has been working in the solar industry since 2006 and has been involved in the design and construction of hundreds of PV systems,... Learn more

Ryan Mayfield

Founder & CEO, Mayfield Renewables

Ryan Mayfield has been working in the renewable energy field since 1999 and is the President of Mayfield Renewables (formerly Renewable Energy Associates), a consulting firm providing design, support and educational services for electrical contractors, architectural and engineering firms, manufacturers and government agencies. Ryan served as Photovoltaic Systems... Learn more

Ratings

4.6

146 reviews

1,222 students have taken this course

by Ted Monhollon 01/20/2023

by Nelson F 04/01/2021

by Radouane Zouaghi 03/25/2021

Excellent lesson

by Jason Bone, PV Instructor, Halifax Community College 12/16/2020

Great value in a topic we always need for knowledge in, arc flash.

by John Paul Manabat, Operations and Maintenance Engineer, Negros Island Solar Power, Inc. 09/25/2020

It's very good for the Licensed Electrical Practitioner for PV Systems.

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